Merge tag 'iio-for-5.6a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

First set of new device support, features and cleanups for IIO in the 5.6 cycle

New device support

* ad7091r5 ADC
  - New driver with follow up patch adding scale and vref support.
  - DT bindings
* ad7923
  - Support for ad7908, ad7918 and ad7928 added to driver.
* bma180
  - Support the BMA254 accelerometer. Required fairly substantial rework
    to allow for small differences between this an existing parts.
* bma400 accelerometer
  - New driver with follow up patch for regulator support.
  - DT bindings.
* asc dlhl60d
  - New driver support this range of pressure and temperature sensors.
  - DT bindings.
* ltc2496 ADC
  - New driver to support this ADC.
  - Split the existing LTC2497 driver generic component out and reuse.
  - DT bindings.
* parallax ping
  - New driver supporting ultrasonic and laser tof distance sensors.
  - Bindings for these sensors.

New features

* core
  - New char type for read_raw returns, used for thermocouple types.
  - Rename read_first_n callback to read.   The reasons behind the original
    naming are lost to the mists of time.
* ad799x
  - Allow pm_ops to disable device completely allowing regulator power down.
* bma180
  - Enable basic regulator support.
* dmaengine buffer
  - Report platform data alignment requirements via new ABI.
* max31856
  - Add option to set mains filter rejection frequency and document
    new in_temp_filter_notch_center_frequency ABI.
  - Add support for configuring HW averaging (oversampling ratio)
  - Add runtime configuration of thermocouple type and document new ABI.
* maxim-thermocouple
  - Add read only access to thermocouple type using new ABI, includes
    adding more specific compatibles to reflect which variant of the
    chip is being used.
* mpu6050
  - Provide option to support the PMU9150 in package magnetometer directly
    rather than via auxiliary bus.
* stm32_adc
  - Add overrun interrupt checks to detect if this happens.
* st_lsm6dsx
  - Enable the sensor-hub support for lsm6dsm. Includes various reworks to
    allow this.

Cleanups and minor fixes

* Subsystem wide
  - Tidy up indentation in Kconfig and fix alphabetical order of AD7091R5.
  - Drop linux/gpio.h and linux/of_gpio.h from drivers that don't use them.
* ad7266
  - Convert to GPIO descriptors.
* ad7303
  - Avoid a dance with checking if the regulator is supplied by just
    using the optional request interface.
* ad7887
  - Simplify channel specification assignment to enable adding more devices.
* ad7923
  - Drop some unused and largely pointless defines of BOB_N==N variety.
  - Tidy up checkpatch warnings.
  - Add missing of_device_id table.
* adf4350
  - Convert to GPIO descriptors.
* ak8975
  - Convert to GPIO descriptors.
* ADIS library and drivers
  - Expand scope of txrx_lock to cover all state and rename as state_lock
  - Add unlocked read / write to allow grouping of consecutive calls under
    single lock / unlock.
  - Add unlocked check_status, reset to allow grouping under single
    lock / unlock.
  - Remove remaining uses of core mlock for local state protection.
    mlock should never be used directly as it protects tightly defined
    core IIO device management state.
* adis16240
  - Enforce only supported SPI mode on driver load + add DT binding doc.
* atlas-ph-sensor
  - Rename to atlas-sensor given it now covers things beyond ph sensors.
* bma180
  - Use local dev variable to tidy up code.
  - Use c99 style explicity .member assignment to make driver more readable.
* bmp280
  - Drop ACPI support. No evidence this was used and appropriate ID is not
    registered.
  - Allow ACPI to bind device via PRP0001
* dmaengine buffer
  - Use dma_request_chan instead of dma_request_slave_channel_reason as that
    ABI is going away.
  - Add module info to avoid tainting the kernel.
* hts221
  - Avoid magic number defines when only used to fill structure elements
    that are self describing.
* lm3533
  - Drop a stray semicolon.
* max9611
  - Cleanup enum handling to be more resilient to future changes.
* mpu6050
  - Delete MPU9150 from supported SPI devices as doesn't provide SPI.
  - Select I2C_MUX again after kbuild issue fixed elsewhere.
* stm32-timer
  - Drop an unnecessary register update.
* ssp_sensors
  - Convert to GPIO descriptors.
* st_sensors
  - drop !CONFIG_ACPI defines as ACPI_PTR() will stop them being used
    anyway.
  - Make default platform data structures __maybe_unsued.
  - Fill in some missing kernel-doc function parameters.
* st_lsm6dsx
  - white space fixes.
  - Mark some constants that aren't always used as __maybe_unused.
  - Drop of ID table guards as they just pervent use under ACPI.
  - Switch to device properties to allow ACPI usage.
* st_uvis25
  - Drop acpi.h include as no ACPI APIs used.
* ti-ads1015
  - Drop legacy platform data as no one seems to be using it.
  - Use the device property API instead of OF specific.
* ti-ads7950
  - typo fix in error message.

* tag 'iio-for-5.6a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (99 commits)
  iio: accel: bma180: BMA254 support
  iio: pressure: bmp280: Allow device to be enumerated from ACPI
  iio: pressure: bmp280: Drop ACPI support
  dt-bindings: iio: adc: convert sd modulator to json-schema
  iio: buffer: rename 'read_first_n' callback to 'read'
  iio: buffer-dmaengine: Report buffer length requirements
  bindings: iio: pressure: Add documentation for dlh driver
  dt-bindings: Add asc vendor
  iio: pressure: Add driver for DLH pressure sensors
  iio: buffer-dmaengine: Add module information
  iio: accel: bma180: Use explicit member assignment
  iio: accel: bma180: Basic regulator support
  iio: accel: bma180: Add dev helper variable
  iio: imu: st_lsm6dsx: enable sensor-hub support for lsm6dsm
  iio: imu: st_lsm6dsx: rename st_lsm6dsx_shub_read_reg in st_lsm6dsx_shub_read_output
  iio: imu: st_lsm6dsx: check if shub_output reg is located in primary page
  iio: imu: st_lsm6dsx: check if pull_up is located in primary page
  iio: imu: st_lsm6dsx: check if master_enable is located in primary page
  iio: imu: st_lsm6dsx: export max num of slave devices in st_lsm6dsx_shub_settings
  iio: light: remove unneeded semicolon
  ...

83 files changed, 3818 insertions, 801 deletions

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index d4ef35aeb579..5d91a6dda894 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -89,13 +89,13 @@ config ADXL372_I2C
 	  module will be called adxl372_i2c.
 
 config BMA180
-	tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"
+	tristate "Bosch BMA180/BMA25x 3-Axis Accelerometer Driver"
 	depends on I2C
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help
 	  Say Y here if you want to build a driver for the Bosch BMA180 or
-	  BMA250 triaxial acceleration sensor.
+	  BMA25x triaxial acceleration sensor.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called bma180.
@@ -112,6 +112,22 @@ config BMA220
 	  To compile this driver as a module, choose M here: the
 	  module will be called bma220_spi.
 
+config BMA400
+	tristate "Bosch BMA400 3-Axis Accelerometer Driver"
+	select REGMAP
+	select BMA400_I2C if I2C
+	help
+	  Say Y here if you want to build a driver for the Bosch BMA400
+	  triaxial acceleration sensor.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bma400_core and you will also get
+	  bma400_i2c if I2C is enabled.
+
+config BMA400_I2C
+	tristate
+	depends on BMA400
+
 config BMC150_ACCEL
 	tristate "Bosch BMC150 Accelerometer Driver"
 	select IIO_BUFFER
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 56bd0215e0d4..3a051cf37f40 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -14,6 +14,8 @@ obj-$(CONFIG_ADXL372_I2C) += adxl372_i2c.o
 obj-$(CONFIG_ADXL372_SPI) += adxl372_spi.o
 obj-$(CONFIG_BMA180) += bma180.o
 obj-$(CONFIG_BMA220) += bma220_spi.o
+obj-$(CONFIG_BMA400) += bma400_core.o
+obj-$(CONFIG_BMA400_I2C) += bma400_i2c.o
 obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
 obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
 obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
index 1574e4604a4f..fcd91d5f05fd 100644
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -9,6 +9,7 @@
  * SPI is not supported by driver
  * BMA180: 7-bit I2C slave address 0x40 or 0x41
  * BMA250: 7-bit I2C slave address 0x18 or 0x19
+ * BMA254: 7-bit I2C slave address 0x18 or 0x19
  */
 
 #include <linux/module.h>
@@ -18,6 +19,7 @@
 #include <linux/of_device.h>
 #include <linux/of.h>
 #include <linux/bitops.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/iio/iio.h>
@@ -33,17 +35,20 @@
 enum chip_ids {
 	BMA180,
 	BMA250,
+	BMA254,
 };
 
 struct bma180_data;
 
 struct bma180_part_info {
+	u8 chip_id;
 	const struct iio_chan_spec *channels;
 	unsigned int num_channels;
 	const int *scale_table;
 	unsigned int num_scales;
 	const int *bw_table;
 	unsigned int num_bw;
+	int center_temp;
 
 	u8 int_reset_reg, int_reset_mask;
 	u8 sleep_reg, sleep_mask;
@@ -51,6 +56,7 @@ struct bma180_part_info {
 	u8 scale_reg, scale_mask;
 	u8 power_reg, power_mask, lowpower_val;
 	u8 int_enable_reg, int_enable_mask;
+	u8 int_map_reg, int_enable_dataready_int1_mask;
 	u8 softreset_reg;
 
 	int (*chip_config)(struct bma180_data *data);
@@ -89,6 +95,8 @@ struct bma180_part_info {
 #define BMA180_RESET_VAL	0xb6
 
 #define BMA180_ID_REG_VAL	0x03
+#define BMA250_ID_REG_VAL	0x03
+#define BMA254_ID_REG_VAL	0xfa /* 250 decimal */
 
 /* Chip power modes */
 #define BMA180_LOW_POWER	0x03
@@ -109,7 +117,26 @@ struct bma180_part_info {
 #define BMA250_INT1_DATA_MASK	BIT(0)
 #define BMA250_INT_RESET_MASK	BIT(7) /* Reset pending interrupts */
 
+#define BMA254_RANGE_REG	0x0f
+#define BMA254_BW_REG		0x10
+#define BMA254_POWER_REG	0x11
+#define BMA254_RESET_REG	0x14
+#define BMA254_INT_ENABLE_REG	0x17
+#define BMA254_INT_MAP_REG	0x1a
+#define BMA254_INT_RESET_REG	0x21
+
+#define BMA254_RANGE_MASK	GENMASK(3, 0) /* Range of accel values */
+#define BMA254_BW_MASK		GENMASK(4, 0) /* Accel bandwidth */
+#define BMA254_SUSPEND_MASK	BIT(7) /* chip will sleep */
+#define BMA254_LOWPOWER_MASK	BIT(6)
+#define BMA254_DATA_INTEN_MASK	BIT(4)
+#define BMA254_INT2_DATA_MASK	BIT(7)
+#define BMA254_INT1_DATA_MASK	BIT(0)
+#define BMA254_INT_RESET_MASK	BIT(7) /* Reset pending interrupts */
+
 struct bma180_data {
+	struct regulator *vdd_supply;
+	struct regulator *vddio_supply;
 	struct i2c_client *client;
 	struct iio_trigger *trig;
 	const struct bma180_part_info *part_info;
@@ -132,8 +159,8 @@ enum bma180_chan {
 static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
 static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };
 
-static int bma250_bw_table[] = { 8, 16, 31, 63, 125, 250 }; /* Hz */
-static int bma250_scale_table[] = { 0, 0, 0, 38344, 0, 76590, 0, 0, 153180, 0,
+static int bma25x_bw_table[] = { 8, 16, 31, 63, 125, 250 }; /* Hz */
+static int bma25x_scale_table[] = { 0, 0, 0, 38344, 0, 76590, 0, 0, 153180, 0,
 	0, 0, 306458 };
 
 static int bma180_get_data_reg(struct bma180_data *data, enum bma180_chan chan)
@@ -307,8 +334,11 @@ static int bma180_chip_init(struct bma180_data *data)
 
 	if (ret < 0)
 		return ret;
-	if (ret != BMA180_ID_REG_VAL)
+	if (ret != data->part_info->chip_id) {
+		dev_err(&data->client->dev, "wrong chip ID %d expected %d\n",
+			ret, data->part_info->chip_id);
 		return -ENODEV;
+	}
 
 	ret = bma180_soft_reset(data);
 	if (ret)
@@ -355,7 +385,7 @@ err:
 	return ret;
 }
 
-static int bma250_chip_config(struct bma180_data *data)
+static int bma25x_chip_config(struct bma180_data *data)
 {
 	int ret = bma180_chip_init(data);
 
@@ -367,8 +397,12 @@ static int bma250_chip_config(struct bma180_data *data)
 	ret = bma180_set_scale(data, 38344); /* 2 G */
 	if (ret)
 		goto err;
-	ret = bma180_set_bits(data, BMA250_INT_MAP_REG,
-		BMA250_INT1_DATA_MASK, 1);
+	/*
+	 * This enables dataready interrupt on the INT1 pin
+	 * FIXME: support using the INT2 pin
+	 */
+	ret = bma180_set_bits(data, data->part_info->int_map_reg,
+		data->part_info->int_enable_dataready_int1_mask, 1);
 	if (ret)
 		goto err;
 
@@ -394,7 +428,7 @@ err:
 	dev_err(&data->client->dev, "failed to disable the chip\n");
 }
 
-static void bma250_chip_disable(struct bma180_data *data)
+static void bma25x_chip_disable(struct bma180_data *data)
 {
 	if (bma180_set_new_data_intr_state(data, false))
 		goto err;
@@ -497,7 +531,7 @@ static int bma180_read_raw(struct iio_dev *indio_dev,
 			return -EINVAL;
 		}
 	case IIO_CHAN_INFO_OFFSET:
-		*val = 48; /* 0 LSB @ 24 degree C */
+		*val = data->part_info->center_temp;
 		return IIO_VAL_INT;
 	default:
 		return -EINVAL;
@@ -627,34 +661,96 @@ static const struct iio_chan_spec bma250_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(4),
 };
 
+static const struct iio_chan_spec bma254_channels[] = {
+	BMA180_ACC_CHANNEL(X, 12),
+	BMA180_ACC_CHANNEL(Y, 12),
+	BMA180_ACC_CHANNEL(Z, 12),
+	BMA180_TEMP_CHANNEL,
+	IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
 static const struct bma180_part_info bma180_part_info[] = {
 	[BMA180] = {
-		bma180_channels, ARRAY_SIZE(bma180_channels),
-		bma180_scale_table, ARRAY_SIZE(bma180_scale_table),
-		bma180_bw_table, ARRAY_SIZE(bma180_bw_table),
-		BMA180_CTRL_REG0, BMA180_RESET_INT,
-		BMA180_CTRL_REG0, BMA180_SLEEP,
-		BMA180_BW_TCS, BMA180_BW,
-		BMA180_OFFSET_LSB1, BMA180_RANGE,
-		BMA180_TCO_Z, BMA180_MODE_CONFIG, BMA180_LOW_POWER,
-		BMA180_CTRL_REG3, BMA180_NEW_DATA_INT,
-		BMA180_RESET,
-		bma180_chip_config,
-		bma180_chip_disable,
+		.chip_id = BMA180_ID_REG_VAL,
+		.channels = bma180_channels,
+		.num_channels = ARRAY_SIZE(bma180_channels),
+		.scale_table = bma180_scale_table,
+		.num_scales = ARRAY_SIZE(bma180_scale_table),
+		.bw_table = bma180_bw_table,
+		.num_bw = ARRAY_SIZE(bma180_bw_table),
+		.center_temp = 48, /* 0 LSB @ 24 degree C */
+		.int_reset_reg = BMA180_CTRL_REG0,
+		.int_reset_mask = BMA180_RESET_INT,
+		.sleep_reg = BMA180_CTRL_REG0,
+		.sleep_mask = BMA180_SLEEP,
+		.bw_reg = BMA180_BW_TCS,
+		.bw_mask = BMA180_BW,
+		.scale_reg = BMA180_OFFSET_LSB1,
+		.scale_mask = BMA180_RANGE,
+		.power_reg = BMA180_TCO_Z,
+		.power_mask = BMA180_MODE_CONFIG,
+		.lowpower_val = BMA180_LOW_POWER,
+		.int_enable_reg = BMA180_CTRL_REG3,
+		.int_enable_mask = BMA180_NEW_DATA_INT,
+		.softreset_reg = BMA180_RESET,
+		.chip_config = bma180_chip_config,
+		.chip_disable = bma180_chip_disable,
 	},
 	[BMA250] = {
-		bma250_channels, ARRAY_SIZE(bma250_channels),
-		bma250_scale_table, ARRAY_SIZE(bma250_scale_table),
-		bma250_bw_table, ARRAY_SIZE(bma250_bw_table),
-		BMA250_INT_RESET_REG, BMA250_INT_RESET_MASK,
-		BMA250_POWER_REG, BMA250_SUSPEND_MASK,
-		BMA250_BW_REG, BMA250_BW_MASK,
-		BMA250_RANGE_REG, BMA250_RANGE_MASK,
-		BMA250_POWER_REG, BMA250_LOWPOWER_MASK, 1,
-		BMA250_INT_ENABLE_REG, BMA250_DATA_INTEN_MASK,
-		BMA250_RESET_REG,
-		bma250_chip_config,
-		bma250_chip_disable,
+		.chip_id = BMA250_ID_REG_VAL,
+		.channels = bma250_channels,
+		.num_channels = ARRAY_SIZE(bma250_channels),
+		.scale_table = bma25x_scale_table,
+		.num_scales = ARRAY_SIZE(bma25x_scale_table),
+		.bw_table = bma25x_bw_table,
+		.num_bw = ARRAY_SIZE(bma25x_bw_table),
+		.center_temp = 48, /* 0 LSB @ 24 degree C */
+		.int_reset_reg = BMA250_INT_RESET_REG,
+		.int_reset_mask = BMA250_INT_RESET_MASK,
+		.sleep_reg = BMA250_POWER_REG,
+		.sleep_mask = BMA250_SUSPEND_MASK,
+		.bw_reg = BMA250_BW_REG,
+		.bw_mask = BMA250_BW_MASK,
+		.scale_reg = BMA250_RANGE_REG,
+		.scale_mask = BMA250_RANGE_MASK,
+		.power_reg = BMA250_POWER_REG,
+		.power_mask = BMA250_LOWPOWER_MASK,
+		.lowpower_val = 1,
+		.int_enable_reg = BMA250_INT_ENABLE_REG,
+		.int_enable_mask = BMA250_DATA_INTEN_MASK,
+		.int_map_reg = BMA250_INT_MAP_REG,
+		.int_enable_dataready_int1_mask = BMA250_INT1_DATA_MASK,
+		.softreset_reg = BMA250_RESET_REG,
+		.chip_config = bma25x_chip_config,
+		.chip_disable = bma25x_chip_disable,
+	},
+	[BMA254] = {
+		.chip_id = BMA254_ID_REG_VAL,
+		.channels = bma254_channels,
+		.num_channels = ARRAY_SIZE(bma254_channels),
+		.scale_table = bma25x_scale_table,
+		.num_scales = ARRAY_SIZE(bma25x_scale_table),
+		.bw_table = bma25x_bw_table,
+		.num_bw = ARRAY_SIZE(bma25x_bw_table),
+		.center_temp = 46, /* 0 LSB @ 23 degree C */
+		.int_reset_reg = BMA254_INT_RESET_REG,
+		.int_reset_mask = BMA254_INT_RESET_MASK,
+		.sleep_reg = BMA254_POWER_REG,
+		.sleep_mask = BMA254_SUSPEND_MASK,
+		.bw_reg = BMA254_BW_REG,
+		.bw_mask = BMA254_BW_MASK,
+		.scale_reg = BMA254_RANGE_REG,
+		.scale_mask = BMA254_RANGE_MASK,
+		.power_reg = BMA254_POWER_REG,
+		.power_mask = BMA254_LOWPOWER_MASK,
+		.lowpower_val = 1,
+		.int_enable_reg = BMA254_INT_ENABLE_REG,
+		.int_enable_mask = BMA254_DATA_INTEN_MASK,
+		.int_map_reg = BMA254_INT_MAP_REG,
+		.int_enable_dataready_int1_mask = BMA254_INT1_DATA_MASK,
+		.softreset_reg = BMA254_RESET_REG,
+		.chip_config = bma25x_chip_config,
+		.chip_disable = bma25x_chip_disable,
 	},
 };
 
@@ -712,12 +808,13 @@ static const struct iio_trigger_ops bma180_trigger_ops = {
 static int bma180_probe(struct i2c_client *client,
 		const struct i2c_device_id *id)
 {
+	struct device *dev = &client->dev;
 	struct bma180_data *data;
 	struct iio_dev *indio_dev;
 	enum chip_ids chip;
 	int ret;
 
-	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
 	if (!indio_dev)
 		return -ENOMEM;
 
@@ -725,22 +822,56 @@ static int bma180_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;
 	if (client->dev.of_node)
-		chip = (enum chip_ids)of_device_get_match_data(&client->dev);
+		chip = (enum chip_ids)of_device_get_match_data(dev);
 	else
 		chip = id->driver_data;
 	data->part_info = &bma180_part_info[chip];
 
-	ret = iio_read_mount_matrix(&client->dev, "mount-matrix",
+	ret = iio_read_mount_matrix(dev, "mount-matrix",
 				&data->orientation);
 	if (ret)
 		return ret;
 
+	data->vdd_supply = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(data->vdd_supply)) {
+		if (PTR_ERR(data->vdd_supply) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get vdd regulator %d\n",
+				(int)PTR_ERR(data->vdd_supply));
+		return PTR_ERR(data->vdd_supply);
+	}
+	data->vddio_supply = devm_regulator_get(dev, "vddio");
+	if (IS_ERR(data->vddio_supply)) {
+		if (PTR_ERR(data->vddio_supply) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get vddio regulator %d\n",
+				(int)PTR_ERR(data->vddio_supply));
+		return PTR_ERR(data->vddio_supply);
+	}
+	/* Typical voltage 2.4V these are min and max */
+	ret = regulator_set_voltage(data->vdd_supply, 1620000, 3600000);
+	if (ret)
+		return ret;
+	ret = regulator_set_voltage(data->vddio_supply, 1200000, 3600000);
+	if (ret)
+		return ret;
+	ret = regulator_enable(data->vdd_supply);
+	if (ret) {
+		dev_err(dev, "Failed to enable vdd regulator: %d\n", ret);
+		return ret;
+	}
+	ret = regulator_enable(data->vddio_supply);
+	if (ret) {
+		dev_err(dev, "Failed to enable vddio regulator: %d\n", ret);
+		goto err_disable_vdd;
+	}
+	/* Wait to make sure we started up properly (3 ms at least) */
+	usleep_range(3000, 5000);
+
 	ret = data->part_info->chip_config(data);
 	if (ret < 0)
 		goto err_chip_disable;
 
 	mutex_init(&data->mutex);
-	indio_dev->dev.parent = &client->dev;
+	indio_dev->dev.parent = dev;
 	indio_dev->channels = data->part_info->channels;
 	indio_dev->num_channels = data->part_info->num_channels;
 	indio_dev->name = id->name;
@@ -755,15 +886,15 @@ static int bma180_probe(struct i2c_client *client,
 			goto err_chip_disable;
 		}
 
-		ret = devm_request_irq(&client->dev, client->irq,
+		ret = devm_request_irq(dev, client->irq,
 			iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING,
 			"bma180_event", data->trig);
 		if (ret) {
-			dev_err(&client->dev, "unable to request IRQ\n");
+			dev_err(dev, "unable to request IRQ\n");
 			goto err_trigger_free;
 		}
 
-		data->trig->dev.parent = &client->dev;
+		data->trig->dev.parent = dev;
 		data->trig->ops = &bma180_trigger_ops;
 		iio_trigger_set_drvdata(data->trig, indio_dev);
 		indio_dev->trig = iio_trigger_get(data->trig);
@@ -776,13 +907,13 @@ static int bma180_probe(struct i2c_client *client,
 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
 			bma180_trigger_handler, NULL);
 	if (ret < 0) {
-		dev_err(&client->dev, "unable to setup iio triggered buffer\n");
+		dev_err(dev, "unable to setup iio triggered buffer\n");
 		goto err_trigger_unregister;
 	}
 
 	ret = iio_device_register(indio_dev);
 	if (ret < 0) {
-		dev_err(&client->dev, "unable to register iio device\n");
+		dev_err(dev, "unable to register iio device\n");
 		goto err_buffer_cleanup;
 	}
 
@@ -797,6 +928,9 @@ err_trigger_free:
 	iio_trigger_free(data->trig);
 err_chip_disable:
 	data->part_info->chip_disable(data);
+	regulator_disable(data->vddio_supply);
+err_disable_vdd:
+	regulator_disable(data->vdd_supply);
 
 	return ret;
 }
@@ -816,6 +950,8 @@ static int bma180_remove(struct i2c_client *client)
 	mutex_lock(&data->mutex);
 	data->part_info->chip_disable(data);
 	mutex_unlock(&data->mutex);
+	regulator_disable(data->vddio_supply);
+	regulator_disable(data->vdd_supply);
 
 	return 0;
 }
@@ -856,6 +992,7 @@ static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
 static const struct i2c_device_id bma180_ids[] = {
 	{ "bma180", BMA180 },
 	{ "bma250", BMA250 },
+	{ "bma254", BMA254 },
 	{ }
 };
 
@@ -870,6 +1007,10 @@ static const struct of_device_id bma180_of_match[] = {
 		.compatible = "bosch,bma250",
 		.data = (void *)BMA250
 	},
+	{
+		.compatible = "bosch,bma254",
+		.data = (void *)BMA254
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, bma180_of_match);
@@ -889,5 +1030,5 @@ module_i2c_driver(bma180_driver);
 
 MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
 MODULE_AUTHOR("Texas Instruments, Inc.");
-MODULE_DESCRIPTION("Bosch BMA180/BMA250 triaxial acceleration sensor");
+MODULE_DESCRIPTION("Bosch BMA180/BMA25x triaxial acceleration sensor");
 MODULE_LICENSE("GPL");
diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h
new file mode 100644
index 000000000000..5ad10db9819f
--- /dev/null
+++ b/drivers/iio/accel/bma400.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Register constants and other forward declarations needed by the bma400
+ * sources.
+ *
+ * Copyright 2019 Dan Robertson <dan@dlrobertson.com>
+ */
+
+#ifndef _BMA400_H_
+#define _BMA400_H_
+
+#include <linux/bits.h>
+#include <linux/regmap.h>
+
+/*
+ * Read-Only Registers
+ */
+
+/* Status and ID registers */
+#define BMA400_CHIP_ID_REG          0x00
+#define BMA400_ERR_REG              0x02
+#define BMA400_STATUS_REG           0x03
+
+/* Acceleration registers */
+#define BMA400_X_AXIS_LSB_REG       0x04
+#define BMA400_X_AXIS_MSB_REG       0x05
+#define BMA400_Y_AXIS_LSB_REG       0x06
+#define BMA400_Y_AXIS_MSB_REG       0x07
+#define BMA400_Z_AXIS_LSB_REG       0x08
+#define BMA400_Z_AXIS_MSB_REG       0x09
+
+/* Sensor time registers */
+#define BMA400_SENSOR_TIME0         0x0a
+#define BMA400_SENSOR_TIME1         0x0b
+#define BMA400_SENSOR_TIME2         0x0c
+
+/* Event and interrupt registers */
+#define BMA400_EVENT_REG            0x0d
+#define BMA400_INT_STAT0_REG        0x0e
+#define BMA400_INT_STAT1_REG        0x0f
+#define BMA400_INT_STAT2_REG        0x10
+
+/* Temperature register */
+#define BMA400_TEMP_DATA_REG        0x11
+
+/* FIFO length and data registers */
+#define BMA400_FIFO_LENGTH0_REG     0x12
+#define BMA400_FIFO_LENGTH1_REG     0x13
+#define BMA400_FIFO_DATA_REG        0x14
+
+/* Step count registers */
+#define BMA400_STEP_CNT0_REG        0x15
+#define BMA400_STEP_CNT1_REG        0x16
+#define BMA400_STEP_CNT3_REG        0x17
+#define BMA400_STEP_STAT_REG        0x18
+
+/*
+ * Read-write configuration registers
+ */
+#define BMA400_ACC_CONFIG0_REG      0x19
+#define BMA400_ACC_CONFIG1_REG      0x1a
+#define BMA400_ACC_CONFIG2_REG      0x1b
+#define BMA400_CMD_REG              0x7e
+
+/* Chip ID of BMA 400 devices found in the chip ID register. */
+#define BMA400_ID_REG_VAL           0x90
+
+#define BMA400_LP_OSR_SHIFT         5
+#define BMA400_NP_OSR_SHIFT         4
+#define BMA400_SCALE_SHIFT          6
+
+#define BMA400_TWO_BITS_MASK        GENMASK(1, 0)
+#define BMA400_LP_OSR_MASK          GENMASK(6, 5)
+#define BMA400_NP_OSR_MASK          GENMASK(5, 4)
+#define BMA400_ACC_ODR_MASK         GENMASK(3, 0)
+#define BMA400_ACC_SCALE_MASK       GENMASK(7, 6)
+
+#define BMA400_ACC_ODR_MIN_RAW      0x05
+#define BMA400_ACC_ODR_LP_RAW       0x06
+#define BMA400_ACC_ODR_MAX_RAW      0x0b
+
+#define BMA400_ACC_ODR_MAX_HZ       800
+#define BMA400_ACC_ODR_MIN_WHOLE_HZ 25
+#define BMA400_ACC_ODR_MIN_HZ       12
+
+#define BMA400_SCALE_MIN            38357
+#define BMA400_SCALE_MAX            306864
+
+#define BMA400_NUM_REGULATORS       2
+#define BMA400_VDD_REGULATOR        0
+#define BMA400_VDDIO_REGULATOR      1
+
+extern const struct regmap_config bma400_regmap_config;
+
+int bma400_probe(struct device *dev, struct regmap *regmap, const char *name);
+
+int bma400_remove(struct device *dev);
+
+#endif
diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c
new file mode 100644
index 000000000000..ab4a158b35af
--- /dev/null
+++ b/drivers/iio/accel/bma400_core.c
@@ -0,0 +1,852 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Core IIO driver for Bosch BMA400 triaxial acceleration sensor.
+ *
+ * Copyright 2019 Dan Robertson <dan@dlrobertson.com>
+ *
+ * TODO:
+ *  - Support for power management
+ *  - Support events and interrupts
+ *  - Create channel for step count
+ *  - Create channel for sensor time
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include "bma400.h"
+
+/*
+ * The G-range selection may be one of 2g, 4g, 8, or 16g. The scale may
+ * be selected with the acc_range bits of the ACC_CONFIG1 register.
+ * NB: This buffer is populated in the device init.
+ */
+static int bma400_scales[8];
+
+/*
+ * See the ACC_CONFIG1 section of the datasheet.
+ * NB: This buffer is populated in the device init.
+ */
+static int bma400_sample_freqs[14];
+
+static const int bma400_osr_range[] = { 0, 1, 3 };
+
+/* See the ACC_CONFIG0 section of the datasheet */
+enum bma400_power_mode {
+	POWER_MODE_SLEEP   = 0x00,
+	POWER_MODE_LOW     = 0x01,
+	POWER_MODE_NORMAL  = 0x02,
+	POWER_MODE_INVALID = 0x03,
+};
+
+struct bma400_sample_freq {
+	int hz;
+	int uhz;
+};
+
+struct bma400_data {
+	struct device *dev;
+	struct regmap *regmap;
+	struct regulator_bulk_data regulators[BMA400_NUM_REGULATORS];
+	struct mutex mutex; /* data register lock */
+	struct iio_mount_matrix orientation;
+	enum bma400_power_mode power_mode;
+	struct bma400_sample_freq sample_freq;
+	int oversampling_ratio;
+	int scale;
+};
+
+static bool bma400_is_writable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case BMA400_CHIP_ID_REG:
+	case BMA400_ERR_REG:
+	case BMA400_STATUS_REG:
+	case BMA400_X_AXIS_LSB_REG:
+	case BMA400_X_AXIS_MSB_REG:
+	case BMA400_Y_AXIS_LSB_REG:
+	case BMA400_Y_AXIS_MSB_REG:
+	case BMA400_Z_AXIS_LSB_REG:
+	case BMA400_Z_AXIS_MSB_REG:
+	case BMA400_SENSOR_TIME0:
+	case BMA400_SENSOR_TIME1:
+	case BMA400_SENSOR_TIME2:
+	case BMA400_EVENT_REG:
+	case BMA400_INT_STAT0_REG:
+	case BMA400_INT_STAT1_REG:
+	case BMA400_INT_STAT2_REG:
+	case BMA400_TEMP_DATA_REG:
+	case BMA400_FIFO_LENGTH0_REG:
+	case BMA400_FIFO_LENGTH1_REG:
+	case BMA400_FIFO_DATA_REG:
+	case BMA400_STEP_CNT0_REG:
+	case BMA400_STEP_CNT1_REG:
+	case BMA400_STEP_CNT3_REG:
+	case BMA400_STEP_STAT_REG:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static bool bma400_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case BMA400_ERR_REG:
+	case BMA400_STATUS_REG:
+	case BMA400_X_AXIS_LSB_REG:
+	case BMA400_X_AXIS_MSB_REG:
+	case BMA400_Y_AXIS_LSB_REG:
+	case BMA400_Y_AXIS_MSB_REG:
+	case BMA400_Z_AXIS_LSB_REG:
+	case BMA400_Z_AXIS_MSB_REG:
+	case BMA400_SENSOR_TIME0:
+	case BMA400_SENSOR_TIME1:
+	case BMA400_SENSOR_TIME2:
+	case BMA400_EVENT_REG:
+	case BMA400_INT_STAT0_REG:
+	case BMA400_INT_STAT1_REG:
+	case BMA400_INT_STAT2_REG:
+	case BMA400_TEMP_DATA_REG:
+	case BMA400_FIFO_LENGTH0_REG:
+	case BMA400_FIFO_LENGTH1_REG:
+	case BMA400_FIFO_DATA_REG:
+	case BMA400_STEP_CNT0_REG:
+	case BMA400_STEP_CNT1_REG:
+	case BMA400_STEP_CNT3_REG:
+	case BMA400_STEP_STAT_REG:
+		return true;
+	default:
+		return false;
+	}
+}
+
+const struct regmap_config bma400_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = BMA400_CMD_REG,
+	.cache_type = REGCACHE_RBTREE,
+	.writeable_reg = bma400_is_writable_reg,
+	.volatile_reg = bma400_is_volatile_reg,
+};
+EXPORT_SYMBOL(bma400_regmap_config);
+
+static const struct iio_mount_matrix *
+bma400_accel_get_mount_matrix(const struct iio_dev *indio_dev,
+			      const struct iio_chan_spec *chan)
+{
+	struct bma400_data *data = iio_priv(indio_dev);
+
+	return &data->orientation;
+}
+
+static const struct iio_chan_spec_ext_info bma400_ext_info[] = {
+	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bma400_accel_get_mount_matrix),
+	{ }
+};
+
+#define BMA400_ACC_CHANNEL(_axis) { \
+	.type = IIO_ACCEL, \
+	.modified = 1, \
+	.channel2 = IIO_MOD_##_axis, \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+		BIT(IIO_CHAN_INFO_SCALE) | \
+		BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+		BIT(IIO_CHAN_INFO_SCALE) | \
+		BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+	.ext_info = bma400_ext_info, \
+}
+
+static const struct iio_chan_spec bma400_channels[] = {
+	BMA400_ACC_CHANNEL(X),
+	BMA400_ACC_CHANNEL(Y),
+	BMA400_ACC_CHANNEL(Z),
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	},
+};
+
+static int bma400_get_temp_reg(struct bma400_data *data, int *val, int *val2)
+{
+	unsigned int raw_temp;
+	int host_temp;
+	int ret;
+
+	if (data->power_mode == POWER_MODE_SLEEP)
+		return -EBUSY;
+
+	ret = regmap_read(data->regmap, BMA400_TEMP_DATA_REG, &raw_temp);
+	if (ret)
+		return ret;
+
+	host_temp = sign_extend32(raw_temp, 7);
+	/*
+	 * The formula for the TEMP_DATA register in the datasheet
+	 * is: x * 0.5 + 23
+	 */
+	*val = (host_temp >> 1) + 23;
+	*val2 = (host_temp & 0x1) * 500000;
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int bma400_get_accel_reg(struct bma400_data *data,
+				const struct iio_chan_spec *chan,
+				int *val)
+{
+	__le16 raw_accel;
+	int lsb_reg;
+	int ret;
+
+	if (data->power_mode == POWER_MODE_SLEEP)
+		return -EBUSY;
+
+	switch (chan->channel2) {
+	case IIO_MOD_X:
+		lsb_reg = BMA400_X_AXIS_LSB_REG;
+		break;
+	case IIO_MOD_Y:
+		lsb_reg = BMA400_Y_AXIS_LSB_REG;
+		break;
+	case IIO_MOD_Z:
+		lsb_reg = BMA400_Z_AXIS_LSB_REG;
+		break;
+	default:
+		dev_err(data->dev, "invalid axis channel modifier\n");
+		return -EINVAL;
+	}
+
+	/* bulk read two registers, with the base being the LSB register */
+	ret = regmap_bulk_read(data->regmap, lsb_reg, &raw_accel,
+			       sizeof(raw_accel));
+	if (ret)
+		return ret;
+
+	*val = sign_extend32(le16_to_cpu(raw_accel), 11);
+	return IIO_VAL_INT;
+}
+
+static void bma400_output_data_rate_from_raw(int raw, unsigned int *val,
+					     unsigned int *val2)
+{
+	*val = BMA400_ACC_ODR_MAX_HZ >> (BMA400_ACC_ODR_MAX_RAW - raw);
+	if (raw > BMA400_ACC_ODR_MIN_RAW)
+		*val2 = 0;
+	else
+		*val2 = 500000;
+}
+
+static int bma400_get_accel_output_data_rate(struct bma400_data *data)
+{
+	unsigned int val;
+	unsigned int odr;
+	int ret;
+
+	switch (data->power_mode) {
+	case POWER_MODE_LOW:
+		/*
+		 * Runs at a fixed rate in low-power mode. See section 4.3
+		 * in the datasheet.
+		 */
+		bma400_output_data_rate_from_raw(BMA400_ACC_ODR_LP_RAW,
+						 &data->sample_freq.hz,
+						 &data->sample_freq.uhz);
+		return 0;
+	case POWER_MODE_NORMAL:
+		/*
+		 * In normal mode the ODR can be found in the ACC_CONFIG1
+		 * register.
+		 */
+		ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
+		if (ret)
+			goto error;
+
+		odr = val & BMA400_ACC_ODR_MASK;
+		if (odr < BMA400_ACC_ODR_MIN_RAW ||
+		    odr > BMA400_ACC_ODR_MAX_RAW) {
+			ret = -EINVAL;
+			goto error;
+		}
+
+		bma400_output_data_rate_from_raw(odr, &data->sample_freq.hz,
+						 &data->sample_freq.uhz);
+		return 0;
+	case POWER_MODE_SLEEP:
+		data->sample_freq.hz = 0;
+		data->sample_freq.uhz = 0;
+		return 0;
+	default:
+		ret = 0;
+		goto error;
+	}
+error:
+	data->sample_freq.hz = -1;
+	data->sample_freq.uhz = -1;
+	return ret;
+}
+
+static int bma400_set_accel_output_data_rate(struct bma400_data *data,
+					     int hz, int uhz)
+{
+	unsigned int idx;
+	unsigned int odr;
+	unsigned int val;
+	int ret;
+
+	if (hz >= BMA400_ACC_ODR_MIN_WHOLE_HZ) {
+		if (uhz || hz > BMA400_ACC_ODR_MAX_HZ)
+			return -EINVAL;
+
+		/* Note this works because MIN_WHOLE_HZ is odd */
+		idx = __ffs(hz);
+
+		if (hz >> idx != BMA400_ACC_ODR_MIN_WHOLE_HZ)
+			return -EINVAL;
+
+		idx += BMA400_ACC_ODR_MIN_RAW + 1;
+	} else if (hz == BMA400_ACC_ODR_MIN_HZ && uhz == 500000) {
+		idx = BMA400_ACC_ODR_MIN_RAW;
+	} else {
+		return -EINVAL;
+	}
+
+	ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
+	if (ret)
+		return ret;
+
+	/* preserve the range and normal mode osr */
+	odr = (~BMA400_ACC_ODR_MASK & val) | idx;
+
+	ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG, odr);
+	if (ret)
+		return ret;
+
+	bma400_output_data_rate_from_raw(idx, &data->sample_freq.hz,
+					 &data->sample_freq.uhz);
+	return 0;
+}
+
+static int bma400_get_accel_oversampling_ratio(struct bma400_data *data)
+{
+	unsigned int val;
+	unsigned int osr;
+	int ret;
+
+	/*
+	 * The oversampling ratio is stored in a different register
+	 * based on the power-mode. In normal mode the OSR is stored
+	 * in ACC_CONFIG1. In low-power mode it is stored in
+	 * ACC_CONFIG0.
+	 */
+	switch (data->power_mode) {
+	case POWER_MODE_LOW:
+		ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG, &val);
+		if (ret) {
+			data->oversampling_ratio = -1;
+			return ret;
+		}
+
+		osr = (val & BMA400_LP_OSR_MASK) >> BMA400_LP_OSR_SHIFT;
+
+		data->oversampling_ratio = osr;
+		return 0;
+	case POWER_MODE_NORMAL:
+		ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
+		if (ret) {
+			data->oversampling_ratio = -1;
+			return ret;
+		}
+
+		osr = (val & BMA400_NP_OSR_MASK) >> BMA400_NP_OSR_SHIFT;
+
+		data->oversampling_ratio = osr;
+		return 0;
+	case POWER_MODE_SLEEP:
+		data->oversampling_ratio = 0;
+		return 0;
+	default:
+		data->oversampling_ratio = -1;
+		return -EINVAL;
+	}
+}
+
+static int bma400_set_accel_oversampling_ratio(struct bma400_data *data,
+					       int val)
+{
+	unsigned int acc_config;
+	int ret;
+
+	if (val & ~BMA400_TWO_BITS_MASK)
+		return -EINVAL;
+
+	/*
+	 * The oversampling ratio is stored in a different register
+	 * based on the power-mode.
+	 */
+	switch (data->power_mode) {
+	case POWER_MODE_LOW:
+		ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG,
+				  &acc_config);
+		if (ret)
+			return ret;
+
+		ret = regmap_write(data->regmap, BMA400_ACC_CONFIG0_REG,
+				   (acc_config & ~BMA400_LP_OSR_MASK) |
+				   (val << BMA400_LP_OSR_SHIFT));
+		if (ret) {
+			dev_err(data->dev, "Failed to write out OSR\n");
+			return ret;
+		}
+
+		data->oversampling_ratio = val;
+		return 0;
+	case POWER_MODE_NORMAL:
+		ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG,
+				  &acc_config);
+		if (ret)
+			return ret;
+
+		ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG,
+				   (acc_config & ~BMA400_NP_OSR_MASK) |
+				   (val << BMA400_NP_OSR_SHIFT));
+		if (ret) {
+			dev_err(data->dev, "Failed to write out OSR\n");
+			return ret;
+		}
+
+		data->oversampling_ratio = val;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+	return ret;
+}
+
+static int bma400_accel_scale_to_raw(struct bma400_data *data,
+				     unsigned int val)
+{
+	int raw;
+
+	if (val == 0)
+		return -EINVAL;
+
+	/* Note this works because BMA400_SCALE_MIN is odd */
+	raw = __ffs(val);
+
+	if (val >> raw != BMA400_SCALE_MIN)
+		return -EINVAL;
+
+	return raw;
+}
+
+static int bma400_get_accel_scale(struct bma400_data *data)
+{
+	unsigned int raw_scale;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
+	if (ret)
+		return ret;
+
+	raw_scale = (val & BMA400_ACC_SCALE_MASK) >> BMA400_SCALE_SHIFT;
+	if (raw_scale > BMA400_TWO_BITS_MASK)
+		return -EINVAL;
+
+	data->scale = BMA400_SCALE_MIN << raw_scale;
+
+	return 0;
+}
+
+static int bma400_set_accel_scale(struct bma400_data *data, unsigned int val)
+{
+	unsigned int acc_config;
+	int raw;
+	int ret;
+
+	ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &acc_config);
+	if (ret)
+		return ret;
+
+	raw = bma400_accel_scale_to_raw(data, val);
+	if (raw < 0)
+		return raw;
+
+	ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG,
+			   (acc_config & ~BMA400_ACC_SCALE_MASK) |
+			   (raw << BMA400_SCALE_SHIFT));
+	if (ret)
+		return ret;
+
+	data->scale = val;
+	return 0;
+}
+
+static int bma400_get_power_mode(struct bma400_data *data)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(data->regmap, BMA400_STATUS_REG, &val);
+	if (ret) {
+		dev_err(data->dev, "Failed to read status register\n");
+		return ret;
+	}
+
+	data->power_mode = (val >> 1) & BMA400_TWO_BITS_MASK;
+	return 0;
+}
+
+static int bma400_set_power_mode(struct bma400_data *data,
+				 enum bma400_power_mode mode)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG, &val);
+	if (ret)
+		return ret;
+
+	if (data->power_mode == mode)
+		return 0;
+
+	if (mode == POWER_MODE_INVALID)
+		return -EINVAL;
+
+	/* Preserve the low-power oversample ratio etc */
+	ret = regmap_write(data->regmap, BMA400_ACC_CONFIG0_REG,
+			   mode | (val & ~BMA400_TWO_BITS_MASK));
+	if (ret) {
+		dev_err(data->dev, "Failed to write to power-mode\n");
+		return ret;
+	}
+
+	data->power_mode = mode;
+
+	/*
+	 * Update our cached osr and odr based on the new
+	 * power-mode.
+	 */
+	bma400_get_accel_output_data_rate(data);
+	bma400_get_accel_oversampling_ratio(data);
+	return 0;
+}
+
+static void bma400_init_tables(void)
+{
+	int raw;
+	int i;
+
+	for (i = 0; i + 1 < ARRAY_SIZE(bma400_sample_freqs); i += 2) {
+		raw = (i / 2) + 5;
+		bma400_output_data_rate_from_raw(raw, &bma400_sample_freqs[i],
+						 &bma400_sample_freqs[i + 1]);
+	}
+
+	for (i = 0; i + 1 < ARRAY_SIZE(bma400_scales); i += 2) {
+		raw = i / 2;
+		bma400_scales[i] = 0;
+		bma400_scales[i + 1] = BMA400_SCALE_MIN << raw;
+	}
+}
+
+static int bma400_init(struct bma400_data *data)
+{
+	unsigned int val;
+	int ret;
+
+	/* Try to read chip_id register. It must return 0x90. */
+	ret = regmap_read(data->regmap, BMA400_CHIP_ID_REG, &val);
+	if (ret) {
+		dev_err(data->dev, "Failed to read chip id register\n");
+		goto out;
+	}
+
+	if (val != BMA400_ID_REG_VAL) {
+		dev_err(data->dev, "Chip ID mismatch\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	data->regulators[BMA400_VDD_REGULATOR].supply = "vdd";
+	data->regulators[BMA400_VDDIO_REGULATOR].supply = "vddio";
+	ret = devm_regulator_bulk_get(data->dev,
+				      ARRAY_SIZE(data->regulators),
+				      data->regulators);
+	if (ret) {
+		if (ret != -EPROBE_DEFER)
+			dev_err(data->dev,
+				"Failed to get regulators: %d\n",
+				ret);
+
+		goto out;
+	}
+	ret = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
+				    data->regulators);
+	if (ret) {
+		dev_err(data->dev, "Failed to enable regulators: %d\n",
+			ret);
+		goto out;
+	}
+
+	ret = bma400_get_power_mode(data);
+	if (ret) {
+		dev_err(data->dev, "Failed to get the initial power-mode\n");
+		goto err_reg_disable;
+	}
+
+	if (data->power_mode != POWER_MODE_NORMAL) {
+		ret = bma400_set_power_mode(data, POWER_MODE_NORMAL);
+		if (ret) {
+			dev_err(data->dev, "Failed to wake up the device\n");
+			goto err_reg_disable;
+		}
+		/*
+		 * TODO: The datasheet waits 1500us here in the example, but
+		 * lists 2/ODR as the wakeup time.
+		 */
+		usleep_range(1500, 2000);
+	}
+
+	bma400_init_tables();
+
+	ret = bma400_get_accel_output_data_rate(data);
+	if (ret)
+		goto err_reg_disable;
+
+	ret = bma400_get_accel_oversampling_ratio(data);
+	if (ret)
+		goto err_reg_disable;
+
+	ret = bma400_get_accel_scale(data);
+	if (ret)
+		goto err_reg_disable;
+
+	/*
+	 * Once the interrupt engine is supported we might use the
+	 * data_src_reg, but for now ensure this is set to the
+	 * variable ODR filter selectable by the sample frequency
+	 * channel.
+	 */
+	return regmap_write(data->regmap, BMA400_ACC_CONFIG2_REG, 0x00);
+
+err_reg_disable:
+	regulator_bulk_disable(ARRAY_SIZE(data->regulators),
+			       data->regulators);
+out:
+	return ret;
+}
+
+static int bma400_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan, int *val,
+			   int *val2, long mask)
+{
+	struct bma400_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		mutex_lock(&data->mutex);
+		ret = bma400_get_temp_reg(data, val, val2);
+		mutex_unlock(&data->mutex);
+		return ret;
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&data->mutex);
+		ret = bma400_get_accel_reg(data, chan, val);
+		mutex_unlock(&data->mutex);
+		return ret;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		switch (chan->type) {
+		case IIO_ACCEL:
+			if (data->sample_freq.hz < 0)
+				return -EINVAL;
+
+			*val = data->sample_freq.hz;
+			*val2 = data->sample_freq.uhz;
+			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_TEMP:
+			/*
+			 * Runs at a fixed sampling frequency. See Section 4.4
+			 * of the datasheet.
+			 */
+			*val = 6;
+			*val2 = 250000;
+			return IIO_VAL_INT_PLUS_MICRO;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_SCALE:
+		*val = 0;
+		*val2 = data->scale;
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		/*
+		 * TODO: We could avoid this logic and returning -EINVAL here if
+		 * we set both the low-power and normal mode OSR registers when
+		 * we configure the device.
+		 */
+		if (data->oversampling_ratio < 0)
+			return -EINVAL;
+
+		*val = data->oversampling_ratio;
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int bma400_read_avail(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     const int **vals, int *type, int *length,
+			     long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		*vals = bma400_scales;
+		*length = ARRAY_SIZE(bma400_scales);
+		return IIO_AVAIL_LIST;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		*type = IIO_VAL_INT;
+		*vals = bma400_osr_range;
+		*length = ARRAY_SIZE(bma400_osr_range);
+		return IIO_AVAIL_RANGE;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		*vals = bma400_sample_freqs;
+		*length = ARRAY_SIZE(bma400_sample_freqs);
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int bma400_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, int val, int val2,
+			    long mask)
+{
+	struct bma400_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		/*
+		 * The sample frequency is readonly for the temperature
+		 * register and a fixed value in low-power mode.
+		 */
+		if (chan->type != IIO_ACCEL)
+			return -EINVAL;
+
+		mutex_lock(&data->mutex);
+		ret = bma400_set_accel_output_data_rate(data, val, val2);
+		mutex_unlock(&data->mutex);
+		return ret;
+	case IIO_CHAN_INFO_SCALE:
+		if (val != 0 || val2 > BMA400_SCALE_MAX)
+			return -EINVAL;
+
+		mutex_lock(&data->mutex);
+		ret = bma400_set_accel_scale(data, val2);
+		mutex_unlock(&data->mutex);
+		return ret;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		mutex_lock(&data->mutex);
+		ret = bma400_set_accel_oversampling_ratio(data, val);
+		mutex_unlock(&data->mutex);
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int bma400_write_raw_get_fmt(struct iio_dev *indio_dev,
+				    struct iio_chan_spec const *chan,
+				    long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_SCALE:
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info bma400_info = {
+	.read_raw          = bma400_read_raw,
+	.read_avail        = bma400_read_avail,
+	.write_raw         = bma400_write_raw,
+	.write_raw_get_fmt = bma400_write_raw_get_fmt,
+};
+
+int bma400_probe(struct device *dev, struct regmap *regmap, const char *name)
+{
+	struct iio_dev *indio_dev;
+	struct bma400_data *data;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->regmap = regmap;
+	data->dev = dev;
+
+	ret = bma400_init(data);
+	if (ret)
+		return ret;
+
+	ret = iio_read_mount_matrix(dev, "mount-matrix", &data->orientation);
+	if (ret)
+		return ret;
+
+	mutex_init(&data->mutex);
+	indio_dev->dev.parent = dev;
+	indio_dev->name = name;
+	indio_dev->info = &bma400_info;
+	indio_dev->channels = bma400_channels;
+	indio_dev->num_channels = ARRAY_SIZE(bma400_channels);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	dev_set_drvdata(dev, indio_dev);
+
+	return iio_device_register(indio_dev);
+}
+EXPORT_SYMBOL(bma400_probe);
+
+int bma400_remove(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct bma400_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->mutex);
+	ret = bma400_set_power_mode(data, POWER_MODE_SLEEP);
+	mutex_unlock(&data->mutex);
+
+	regulator_bulk_disable(ARRAY_SIZE(data->regulators),
+			       data->regulators);
+
+	iio_device_unregister(indio_dev);
+
+	return ret;
+}
+EXPORT_SYMBOL(bma400_remove);
+
+MODULE_AUTHOR("Dan Robertson <dan@dlrobertson.com>");
+MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor core");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/accel/bma400_i2c.c b/drivers/iio/accel/bma400_i2c.c
new file mode 100644
index 000000000000..9dcb7cc9996e
--- /dev/null
+++ b/drivers/iio/accel/bma400_i2c.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * I2C IIO driver for Bosch BMA400 triaxial acceleration sensor.
+ *
+ * Copyright 2019 Dan Robertson <dan@dlrobertson.com>
+ *
+ * I2C address is either 0x14 or 0x15 depending on SDO
+ */
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "bma400.h"
+
+static int bma400_i2c_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id)
+{
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_i2c(client, &bma400_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "failed to create regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	return bma400_probe(&client->dev, regmap, id->name);
+}
+
+static int bma400_i2c_remove(struct i2c_client *client)
+{
+	return bma400_remove(&client->dev);
+}
+
+static const struct i2c_device_id bma400_i2c_ids[] = {
+	{ "bma400", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, bma400_i2c_ids);
+
+static const struct of_device_id bma400_of_i2c_match[] = {
+	{ .compatible = "bosch,bma400" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bma400_of_i2c_match);
+
+static struct i2c_driver bma400_i2c_driver = {
+	.driver = {
+		.name = "bma400",
+		.of_match_table = bma400_of_i2c_match,
+	},
+	.probe    = bma400_i2c_probe,
+	.remove   = bma400_i2c_remove,
+	.id_table = bma400_i2c_ids,
+};
+
+module_i2c_driver(bma400_i2c_driver);
+
+MODULE_AUTHOR("Dan Robertson <dan@dlrobertson.com>");
+MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor (I2C)");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/accel/st_accel.h b/drivers/iio/accel/st_accel.h
index af09943f38c9..5b13e293cade 100644
--- a/drivers/iio/accel/st_accel.h
+++ b/drivers/iio/accel/st_accel.h
@@ -64,7 +64,7 @@ enum st_accel_type {
 * struct st_sensors_platform_data - default accel platform data
 * @drdy_int_pin: default accel DRDY is available on INT1 pin.
 */
-static const struct st_sensors_platform_data default_accel_pdata = {
+static __maybe_unused const struct st_sensors_platform_data default_accel_pdata = {
 	.drdy_int_pin = 1,
 };
 
diff --git a/drivers/iio/accel/st_accel_i2c.c b/drivers/iio/accel/st_accel_i2c.c
index 50fa0fc32baa..0f4aef5448e7 100644
--- a/drivers/iio/accel/st_accel_i2c.c
+++ b/drivers/iio/accel/st_accel_i2c.c
@@ -119,8 +119,6 @@ static const struct acpi_device_id st_accel_acpi_match[] = {
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, st_accel_acpi_match);
-#else
-#define st_accel_acpi_match NULL
 #endif
 
 static const struct i2c_device_id st_accel_id_table[] = {
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 5d8540b7b427..82e33082958c 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -21,6 +21,13 @@ config AD_SIGMA_DELTA
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 
+config AD7091R5
+	tristate "Analog Devices AD7091R5 ADC Driver"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say yes here to build support for Analog Devices AD7091R-5 ADC.
+
 config AD7124
 	tristate "Analog Devices AD7124 and similar sigma-delta ADCs driver"
 	depends on SPI_MASTER
@@ -523,6 +530,16 @@ config LTC2485
 	  To compile this driver as a module, choose M here: the module will be
 	  called ltc2485.
 
+config LTC2496
+	tristate "Linear Technology LTC2496 ADC driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Linear Technology LTC2496
+	  16-Bit 8-/16-Channel Delta Sigma ADC.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ltc2496.
+
 config LTC2497
 	tristate "Linear Technology LTC2497 ADC driver"
 	depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index a1f1fbec0f87..919228900df9 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -6,6 +6,7 @@
 # When adding new entries keep the list in alphabetical order
 obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o
 obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
+obj-$(CONFIG_AD7091R5) += ad7091r5.o ad7091r-base.o
 obj-$(CONFIG_AD7124) += ad7124.o
 obj-$(CONFIG_AD7266) += ad7266.o
 obj-$(CONFIG_AD7291) += ad7291.o
@@ -50,7 +51,8 @@ obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
 obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
 obj-$(CONFIG_LTC2471) += ltc2471.o
 obj-$(CONFIG_LTC2485) += ltc2485.o
-obj-$(CONFIG_LTC2497) += ltc2497.o
+obj-$(CONFIG_LTC2496) += ltc2496.o ltc2497-core.o
+obj-$(CONFIG_LTC2497) += ltc2497.o ltc2497-core.o
 obj-$(CONFIG_MAX1027) += max1027.o
 obj-$(CONFIG_MAX11100) += max11100.o
 obj-$(CONFIG_MAX1118) += max1118.o
diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c
new file mode 100644
index 000000000000..33c40357bd5e
--- /dev/null
+++ b/drivers/iio/adc/ad7091r-base.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AD7091RX Analog to Digital converter driver
+ *
+ * Copyright 2014-2019 Analog Devices Inc.
+ */
+
+#include <linux/bitops.h>
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include "ad7091r-base.h"
+
+#define AD7091R_REG_RESULT  0
+#define AD7091R_REG_CHANNEL 1
+#define AD7091R_REG_CONF    2
+#define AD7091R_REG_ALERT   3
+#define AD7091R_REG_CH_LOW_LIMIT(ch) ((ch) * 3 + 4)
+#define AD7091R_REG_CH_HIGH_LIMIT(ch) ((ch) * 3 + 5)
+#define AD7091R_REG_CH_HYSTERESIS(ch) ((ch) * 3 + 6)
+
+/* AD7091R_REG_RESULT */
+#define AD7091R_REG_RESULT_CH_ID(x)	    (((x) >> 13) & 0x3)
+#define AD7091R_REG_RESULT_CONV_RESULT(x)   ((x) & 0xfff)
+
+/* AD7091R_REG_CONF */
+#define AD7091R_REG_CONF_AUTO   BIT(8)
+#define AD7091R_REG_CONF_CMD    BIT(10)
+
+#define AD7091R_REG_CONF_MODE_MASK  \
+	(AD7091R_REG_CONF_AUTO | AD7091R_REG_CONF_CMD)
+
+enum ad7091r_mode {
+	AD7091R_MODE_SAMPLE,
+	AD7091R_MODE_COMMAND,
+	AD7091R_MODE_AUTOCYCLE,
+};
+
+struct ad7091r_state {
+	struct device *dev;
+	struct regmap *map;
+	struct regulator *vref;
+	const struct ad7091r_chip_info *chip_info;
+	enum ad7091r_mode mode;
+	struct mutex lock; /*lock to prevent concurent reads */
+};
+
+static int ad7091r_set_mode(struct ad7091r_state *st, enum ad7091r_mode mode)
+{
+	int ret, conf;
+
+	switch (mode) {
+	case AD7091R_MODE_SAMPLE:
+		conf = 0;
+		break;
+	case AD7091R_MODE_COMMAND:
+		conf = AD7091R_REG_CONF_CMD;
+		break;
+	case AD7091R_MODE_AUTOCYCLE:
+		conf = AD7091R_REG_CONF_AUTO;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
+				 AD7091R_REG_CONF_MODE_MASK, conf);
+	if (ret)
+		return ret;
+
+	st->mode = mode;
+
+	return 0;
+}
+
+static int ad7091r_set_channel(struct ad7091r_state *st, unsigned int channel)
+{
+	unsigned int dummy;
+	int ret;
+
+	/* AD7091R_REG_CHANNEL specified which channels to be converted */
+	ret = regmap_write(st->map, AD7091R_REG_CHANNEL,
+			BIT(channel) | (BIT(channel) << 8));
+	if (ret)
+		return ret;
+
+	/*
+	 * There is a latency of one conversion before the channel conversion
+	 * sequence is updated
+	 */
+	return regmap_read(st->map, AD7091R_REG_RESULT, &dummy);
+}
+
+static int ad7091r_read_one(struct iio_dev *iio_dev,
+		unsigned int channel, unsigned int *read_val)
+{
+	struct ad7091r_state *st = iio_priv(iio_dev);
+	unsigned int val;
+	int ret;
+
+	ret = ad7091r_set_channel(st, channel);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(st->map, AD7091R_REG_RESULT, &val);
+	if (ret)
+		return ret;
+
+	if (AD7091R_REG_RESULT_CH_ID(val) != channel)
+		return -EIO;
+
+	*read_val = AD7091R_REG_RESULT_CONV_RESULT(val);
+
+	return 0;
+}
+
+static int ad7091r_read_raw(struct iio_dev *iio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long m)
+{
+	struct ad7091r_state *st = iio_priv(iio_dev);
+	unsigned int read_val;
+	int ret;
+
+	mutex_lock(&st->lock);
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		if (st->mode != AD7091R_MODE_COMMAND) {
+			ret = -EBUSY;
+			goto unlock;
+		}
+
+		ret = ad7091r_read_one(iio_dev, chan->channel, &read_val);
+		if (ret)
+			goto unlock;
+
+		*val = read_val;
+		ret = IIO_VAL_INT;
+		break;
+
+	case IIO_CHAN_INFO_SCALE:
+		if (st->vref) {
+			ret = regulator_get_voltage(st->vref);
+			if (ret < 0)
+				goto unlock;
+
+			*val = ret / 1000;
+		} else {
+			*val = st->chip_info->vref_mV;
+		}
+
+		*val2 = chan->scan_type.realbits;
+		ret = IIO_VAL_FRACTIONAL_LOG2;
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+unlock:
+	mutex_unlock(&st->lock);
+	return ret;
+}
+
+static const struct iio_info ad7091r_info = {
+	.read_raw = ad7091r_read_raw,
+};
+
+static irqreturn_t ad7091r_event_handler(int irq, void *private)
+{
+	struct ad7091r_state *st = (struct ad7091r_state *) private;
+	struct iio_dev *iio_dev = dev_get_drvdata(st->dev);
+	unsigned int i, read_val;
+	int ret;
+	s64 timestamp = iio_get_time_ns(iio_dev);
+
+	ret = regmap_read(st->map, AD7091R_REG_ALERT, &read_val);
+	if (ret)
+		return IRQ_HANDLED;
+
+	for (i = 0; i < st->chip_info->num_channels; i++) {
+		if (read_val & BIT(i * 2))
+			iio_push_event(iio_dev,
+					IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
+						IIO_EV_TYPE_THRESH,
+						IIO_EV_DIR_RISING), timestamp);
+		if (read_val & BIT(i * 2 + 1))
+			iio_push_event(iio_dev,
+					IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
+						IIO_EV_TYPE_THRESH,
+						IIO_EV_DIR_FALLING), timestamp);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void ad7091r_remove(void *data)
+{
+	struct ad7091r_state *st = data;
+
+	regulator_disable(st->vref);
+}
+
+int ad7091r_probe(struct device *dev, const char *name,
+		const struct ad7091r_chip_info *chip_info,
+		struct regmap *map, int irq)
+{
+	struct iio_dev *iio_dev;
+	struct ad7091r_state *st;
+	int ret;
+
+	iio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!iio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(iio_dev);
+	st->dev = dev;
+	st->chip_info = chip_info;
+	st->map = map;
+
+	iio_dev->dev.parent = dev;
+	iio_dev->name = name;
+	iio_dev->info = &ad7091r_info;
+	iio_dev->modes = INDIO_DIRECT_MODE;
+
+	iio_dev->num_channels = chip_info->num_channels;
+	iio_dev->channels = chip_info->channels;
+
+	if (irq) {
+		ret = devm_request_threaded_irq(dev, irq, NULL,
+				ad7091r_event_handler,
+				IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, st);
+		if (ret)
+			return ret;
+	}
+
+	st->vref = devm_regulator_get_optional(dev, "vref");
+	if (IS_ERR(st->vref)) {
+		if (PTR_ERR(st->vref) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		st->vref = NULL;
+	} else {
+		ret = regulator_enable(st->vref);
+		if (ret)
+			return ret;
+		ret = devm_add_action_or_reset(dev, ad7091r_remove, st);
+		if (ret)
+			return ret;
+	}
+
+	/* Use command mode by default to convert only desired channels*/
+	ret = ad7091r_set_mode(st, AD7091R_MODE_COMMAND);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(dev, iio_dev);
+}
+EXPORT_SYMBOL_GPL(ad7091r_probe);
+
+static bool ad7091r_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AD7091R_REG_RESULT:
+	case AD7091R_REG_ALERT:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static bool ad7091r_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AD7091R_REG_RESULT:
+	case AD7091R_REG_ALERT:
+		return true;
+	default:
+		return false;
+	}
+}
+
+const struct regmap_config ad7091r_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.writeable_reg = ad7091r_writeable_reg,
+	.volatile_reg = ad7091r_volatile_reg,
+};
+EXPORT_SYMBOL_GPL(ad7091r_regmap_config);
+
+MODULE_AUTHOR("Beniamin Bia <beniamin.bia@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7091Rx multi-channel converters");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ad7091r-base.h b/drivers/iio/adc/ad7091r-base.h
new file mode 100644
index 000000000000..509748aef9b1
--- /dev/null
+++ b/drivers/iio/adc/ad7091r-base.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * AD7091RX Analog to Digital converter driver
+ *
+ * Copyright 2014-2019 Analog Devices Inc.
+ */
+
+#ifndef __DRIVERS_IIO_ADC_AD7091R_BASE_H__
+#define __DRIVERS_IIO_ADC_AD7091R_BASE_H__
+
+struct device;
+struct ad7091r_state;
+
+struct ad7091r_chip_info {
+	unsigned int num_channels;
+	const struct iio_chan_spec *channels;
+	unsigned int vref_mV;
+};
+
+extern const struct regmap_config ad7091r_regmap_config;
+
+int ad7091r_probe(struct device *dev, const char *name,
+		const struct ad7091r_chip_info *chip_info,
+		struct regmap *map, int irq);
+
+#endif /* __DRIVERS_IIO_ADC_AD7091R_BASE_H__ */
diff --git a/drivers/iio/adc/ad7091r5.c b/drivers/iio/adc/ad7091r5.c
new file mode 100644
index 000000000000..9665679c3ea6
--- /dev/null
+++ b/drivers/iio/adc/ad7091r5.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AD7091R5 Analog to Digital converter driver
+ *
+ * Copyright 2014-2019 Analog Devices Inc.
+ */
+
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "ad7091r-base.h"
+
+static const struct iio_event_spec ad7091r5_events[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_ENABLE),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_ENABLE),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_EITHER,
+		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
+	},
+};
+
+#define AD7091R_CHANNEL(idx, bits, ev, num_ev) { \
+	.type = IIO_VOLTAGE, \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+	.indexed = 1, \
+	.channel = idx, \
+	.event_spec = ev, \
+	.num_event_specs = num_ev, \
+	.scan_type.storagebits = 16, \
+	.scan_type.realbits = bits, \
+}
+static const struct iio_chan_spec ad7091r5_channels_irq[] = {
+	AD7091R_CHANNEL(0, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
+	AD7091R_CHANNEL(1, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
+	AD7091R_CHANNEL(2, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
+	AD7091R_CHANNEL(3, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
+};
+
+static const struct iio_chan_spec ad7091r5_channels_noirq[] = {
+	AD7091R_CHANNEL(0, 12, NULL, 0),
+	AD7091R_CHANNEL(1, 12, NULL, 0),
+	AD7091R_CHANNEL(2, 12, NULL, 0),
+	AD7091R_CHANNEL(3, 12, NULL, 0),
+};
+
+static const struct ad7091r_chip_info ad7091r5_chip_info_irq = {
+	.channels = ad7091r5_channels_irq,
+	.num_channels = ARRAY_SIZE(ad7091r5_channels_irq),
+	.vref_mV = 2500,
+};
+
+static const struct ad7091r_chip_info ad7091r5_chip_info_noirq = {
+	.channels = ad7091r5_channels_noirq,
+	.num_channels = ARRAY_SIZE(ad7091r5_channels_noirq),
+	.vref_mV = 2500,
+};
+
+static int ad7091r5_i2c_probe(struct i2c_client *i2c,
+		const struct i2c_device_id *id)
+{
+	const struct ad7091r_chip_info *chip_info;
+	struct regmap *map = devm_regmap_init_i2c(i2c, &ad7091r_regmap_config);
+
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	if (i2c->irq)
+		chip_info = &ad7091r5_chip_info_irq;
+	else
+		chip_info = &ad7091r5_chip_info_noirq;
+
+	return ad7091r_probe(&i2c->dev, id->name, chip_info, map, i2c->irq);
+}
+
+static const struct of_device_id ad7091r5_dt_ids[] = {
+	{ .compatible = "adi,ad7091r5" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ad7091r5_dt_ids);
+
+static const struct i2c_device_id ad7091r5_i2c_ids[] = {
+	{"ad7091r5", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ad7091r5_i2c_ids);
+
+static struct i2c_driver ad7091r5_driver = {
+	.driver = {
+		.name = "ad7091r5",
+		.of_match_table = ad7091r5_dt_ids,
+	},
+	.probe = ad7091r5_i2c_probe,
+	.id_table = ad7091r5_i2c_ids,
+};
+module_i2c_driver(ad7091r5_driver);
+
+MODULE_AUTHOR("Beniamin Bia <beniamin.bia@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7091R5 multi-channel ADC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
index c31b8eabb894..c8524f098883 100644
--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -11,7 +11,7 @@
 #include <linux/spi/spi.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/module.h>
 
 #include <linux/interrupt.h>
@@ -34,7 +34,7 @@ struct ad7266_state {
 	enum ad7266_range	range;
 	enum ad7266_mode	mode;
 	bool			fixed_addr;
-	struct gpio		gpios[3];
+	struct gpio_desc	*gpios[3];
 
 	/*
 	 * DMA (thus cache coherency maintenance) requires the
@@ -117,7 +117,7 @@ static void ad7266_select_input(struct ad7266_state *st, unsigned int nr)
 	}
 
 	for (i = 0; i < 3; ++i)
-		gpio_set_value(st->gpios[i].gpio, (bool)(nr & BIT(i)));
+		gpiod_set_value(st->gpios[i], (bool)(nr & BIT(i)));
 }
 
 static int ad7266_update_scan_mode(struct iio_dev *indio_dev,
@@ -376,7 +376,7 @@ static void ad7266_init_channels(struct iio_dev *indio_dev)
 }
 
 static const char * const ad7266_gpio_labels[] = {
-	"AD0", "AD1", "AD2",
+	"ad0", "ad1", "ad2",
 };
 
 static int ad7266_probe(struct spi_device *spi)
@@ -419,14 +419,14 @@ static int ad7266_probe(struct spi_device *spi)
 
 		if (!st->fixed_addr) {
 			for (i = 0; i < ARRAY_SIZE(st->gpios); ++i) {
-				st->gpios[i].gpio = pdata->addr_gpios[i];
-				st->gpios[i].flags = GPIOF_OUT_INIT_LOW;
-				st->gpios[i].label = ad7266_gpio_labels[i];
+				st->gpios[i] = devm_gpiod_get(&spi->dev,
+						      ad7266_gpio_labels[i],
+						      GPIOD_OUT_LOW);
+				if (IS_ERR(st->gpios[i])) {
+					ret = PTR_ERR(st->gpios[i]);
+					goto error_disable_reg;
+				}
 			}
-			ret = gpio_request_array(st->gpios,
-				ARRAY_SIZE(st->gpios));
-			if (ret)
-				goto error_disable_reg;
 		}
 	} else {
 		st->fixed_addr = true;
@@ -465,7 +465,7 @@ static int ad7266_probe(struct spi_device *spi)
 	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 		&ad7266_trigger_handler, &iio_triggered_buffer_setup_ops);
 	if (ret)
-		goto error_free_gpios;
+		goto error_disable_reg;
 
 	ret = iio_device_register(indio_dev);
 	if (ret)
@@ -475,9 +475,6 @@ static int ad7266_probe(struct spi_device *spi)
 
 error_buffer_cleanup:
 	iio_triggered_buffer_cleanup(indio_dev);
-error_free_gpios:
-	if (!st->fixed_addr)
-		gpio_free_array(st->gpios, ARRAY_SIZE(st->gpios));
 error_disable_reg:
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);
@@ -492,8 +489,6 @@ static int ad7266_remove(struct spi_device *spi)
 
 	iio_device_unregister(indio_dev);
 	iio_triggered_buffer_cleanup(indio_dev);
-	if (!st->fixed_addr)
-		gpio_free_array(st->gpios, ARRAY_SIZE(st->gpios));
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);
 
diff --git a/drivers/iio/adc/ad7887.c b/drivers/iio/adc/ad7887.c
index 6223043e432b..c6a3428e950a 100644
--- a/drivers/iio/adc/ad7887.c
+++ b/drivers/iio/adc/ad7887.c
@@ -43,11 +43,17 @@ enum ad7887_channels {
 /**
  * struct ad7887_chip_info - chip specifc information
  * @int_vref_mv:	the internal reference voltage
- * @channel:		channel specification
+ * @channels:		channels specification
+ * @num_channels:	number of channels
+ * @dual_channels:	channels specification in dual mode
+ * @num_dual_channels:	number of channels in dual mode
  */
 struct ad7887_chip_info {
 	u16				int_vref_mv;
-	struct iio_chan_spec		channel[3];
+	const struct iio_chan_spec	*channels;
+	unsigned int			num_channels;
+	const struct iio_chan_spec	*dual_channels;
+	unsigned int			num_dual_channels;
 };
 
 struct ad7887_state {
@@ -183,45 +189,43 @@ static int ad7887_read_raw(struct iio_dev *indio_dev,
 	return -EINVAL;
 }
 
+#define AD7887_CHANNEL(x) { \
+	.type = IIO_VOLTAGE, \
+	.indexed = 1, \
+	.channel = (x), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+	.address = (x), \
+	.scan_index = (x), \
+	.scan_type = { \
+		.sign = 'u', \
+		.realbits = 12, \
+		.storagebits = 16, \
+		.shift = 0, \
+		.endianness = IIO_BE, \
+	}, \
+}
+
+static const struct iio_chan_spec ad7887_channels[] = {
+	AD7887_CHANNEL(0),
+	IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static const struct iio_chan_spec ad7887_dual_channels[] = {
+	AD7887_CHANNEL(0),
+	AD7887_CHANNEL(1),
+	IIO_CHAN_SOFT_TIMESTAMP(2),
+};
 
 static const struct ad7887_chip_info ad7887_chip_info_tbl[] = {
 	/*
 	 * More devices added in future
 	 */
 	[ID_AD7887] = {
-		.channel[0] = {
-			.type = IIO_VOLTAGE,
-			.indexed = 1,
-			.channel = 1,
-			.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-			.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
-			.address = 1,
-			.scan_index = 1,
-			.scan_type = {
-				.sign = 'u',
-				.realbits = 12,
-				.storagebits = 16,
-				.shift = 0,
-				.endianness = IIO_BE,
-			},
-		},
-		.channel[1] = {
-			.type = IIO_VOLTAGE,
-			.indexed = 1,
-			.channel = 0,
-			.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-			.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
-			.address = 0,
-			.scan_index = 0,
-			.scan_type = {
-				.sign = 'u',
-				.realbits = 12,
-				.storagebits = 16,
-				.shift = 0,
-				.endianness = IIO_BE,
-			},
-		},
-		.channel[2] = IIO_CHAN_SOFT_TIMESTAMP(2),
+		.channels = ad7887_channels,
+		.num_channels = ARRAY_SIZE(ad7887_channels),
+		.dual_channels = ad7887_dual_channels,
+		.num_dual_channels = ARRAY_SIZE(ad7887_dual_channels),
 		.int_vref_mv = 2500,
 	},
 };
@@ -306,11 +310,11 @@ static int ad7887_probe(struct spi_device *spi)
 		spi_message_init(&st->msg[AD7887_CH1]);
 		spi_message_add_tail(&st->xfer[3], &st->msg[AD7887_CH1]);
 
-		indio_dev->channels = st->chip_info->channel;
-		indio_dev->num_channels = 3;
+		indio_dev->channels = st->chip_info->dual_channels;
+		indio_dev->num_channels = st->chip_info->num_dual_channels;
 	} else {
-		indio_dev->channels = &st->chip_info->channel[1];
-		indio_dev->num_channels = 2;
+		indio_dev->channels = st->chip_info->channels;
+		indio_dev->num_channels = st->chip_info->num_channels;
 	}
 
 	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 3212eb4c0f25..1d124c87c6ac 100644
--- a/drivers/iio/adc/ad7923.c
+++ b/drivers/iio/adc/ad7923.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * AD7904/AD7914/AD7923/AD7924 SPI ADC driver
+ * AD7904/AD7914/AD7923/AD7924/AD7908/AD7918/AD7928 SPI ADC driver
  *
  * Copyright 2011 Analog Devices Inc (from AD7923 Driver)
  * Copyright 2012 CS Systemes d'Information
@@ -29,15 +29,10 @@
 #define AD7923_PM_MODE_AS	(1)		/* auto shutdown */
 #define AD7923_PM_MODE_FS	(2)		/* full shutdown */
 #define AD7923_PM_MODE_OPS	(3)		/* normal operation */
-#define AD7923_CHANNEL_0	(0)		/* analog input 0 */
-#define AD7923_CHANNEL_1	(1)		/* analog input 1 */
-#define AD7923_CHANNEL_2	(2)		/* analog input 2 */
-#define AD7923_CHANNEL_3	(3)		/* analog input 3 */
 #define AD7923_SEQUENCE_OFF	(0)		/* no sequence fonction */
 #define AD7923_SEQUENCE_PROTECT	(2)		/* no interrupt write cycle */
 #define AD7923_SEQUENCE_ON	(3)		/* continuous sequence */
 
-#define AD7923_MAX_CHAN		4
 
 #define AD7923_PM_MODE_WRITE(mode)	((mode) << 4)	 /* write mode */
 #define AD7923_CHANNEL_WRITE(channel)	((channel) << 6) /* write channel */
@@ -78,6 +73,9 @@ enum ad7923_id {
 	AD7904,
 	AD7914,
 	AD7924,
+	AD7908,
+	AD7918,
+	AD7928
 };
 
 #define AD7923_V_CHAN(index, bits)					\
@@ -106,9 +104,25 @@ const struct iio_chan_spec name ## _channels[] = { \
 	IIO_CHAN_SOFT_TIMESTAMP(4), \
 }
 
+#define DECLARE_AD7908_CHANNELS(name, bits) \
+const struct iio_chan_spec name ## _channels[] = { \
+	AD7923_V_CHAN(0, bits), \
+	AD7923_V_CHAN(1, bits), \
+	AD7923_V_CHAN(2, bits), \
+	AD7923_V_CHAN(3, bits), \
+	AD7923_V_CHAN(4, bits), \
+	AD7923_V_CHAN(5, bits), \
+	AD7923_V_CHAN(6, bits), \
+	AD7923_V_CHAN(7, bits), \
+	IIO_CHAN_SOFT_TIMESTAMP(8), \
+}
+
 static DECLARE_AD7923_CHANNELS(ad7904, 8);
 static DECLARE_AD7923_CHANNELS(ad7914, 10);
 static DECLARE_AD7923_CHANNELS(ad7924, 12);
+static DECLARE_AD7908_CHANNELS(ad7908, 8);
+static DECLARE_AD7908_CHANNELS(ad7918, 10);
+static DECLARE_AD7908_CHANNELS(ad7928, 12);
 
 static const struct ad7923_chip_info ad7923_chip_info[] = {
 	[AD7904] = {
@@ -123,6 +137,18 @@ static const struct ad7923_chip_info ad7923_chip_info[] = {
 		.channels = ad7924_channels,
 		.num_channels = ARRAY_SIZE(ad7924_channels),
 	},
+	[AD7908] = {
+		.channels = ad7908_channels,
+		.num_channels = ARRAY_SIZE(ad7908_channels),
+	},
+	[AD7918] = {
+		.channels = ad7918_channels,
+		.num_channels = ARRAY_SIZE(ad7918_channels),
+	},
+	[AD7928] = {
+		.channels = ad7928_channels,
+		.num_channels = ARRAY_SIZE(ad7928_channels),
+	},
 };
 
 /**
@@ -135,7 +161,11 @@ static int ad7923_update_scan_mode(struct iio_dev *indio_dev,
 	int i, cmd, len;
 
 	len = 0;
-	for_each_set_bit(i, active_scan_mask, AD7923_MAX_CHAN) {
+	/*
+	 * For this driver the last channel is always the software timestamp so
+	 * skip that one.
+	 */
+	for_each_set_bit(i, active_scan_mask, indio_dev->num_channels - 1) {
 		cmd = AD7923_WRITE_CR | AD7923_CHANNEL_WRITE(i) |
 			AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) |
 			st->settings;
@@ -188,7 +218,7 @@ done:
 	return IRQ_HANDLED;
 }
 
-static int ad7923_scan_direct(struct ad7923_state *st, unsigned ch)
+static int ad7923_scan_direct(struct ad7923_state *st, unsigned int ch)
 {
 	int ret, cmd;
 
@@ -348,13 +378,29 @@ static const struct spi_device_id ad7923_id[] = {
 	{"ad7914", AD7914},
 	{"ad7923", AD7924},
 	{"ad7924", AD7924},
+	{"ad7908", AD7908},
+	{"ad7918", AD7918},
+	{"ad7928", AD7928},
 	{}
 };
 MODULE_DEVICE_TABLE(spi, ad7923_id);
 
+static const struct of_device_id ad7923_of_match[] = {
+	{ .compatible = "adi,ad7904", },
+	{ .compatible = "adi,ad7914", },
+	{ .compatible = "adi,ad7923", },
+	{ .compatible = "adi,ad7924", },
+	{ .compatible = "adi,ad7908", },
+	{ .compatible = "adi,ad7918", },
+	{ .compatible = "adi,ad7928", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ad7923_of_match);
+
 static struct spi_driver ad7923_driver = {
 	.driver = {
 		.name	= "ad7923",
+		.of_match_table = ad7923_of_match,
 	},
 	.probe		= ad7923_probe,
 	.remove		= ad7923_remove,
@@ -364,5 +410,5 @@ module_spi_driver(ad7923_driver);
 
 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_AUTHOR("Patrick Vasseur <patrick.vasseur@c-s.fr>");
-MODULE_DESCRIPTION("Analog Devices AD7904/AD7914/AD7923/AD7924 ADC");
+MODULE_DESCRIPTION("Analog Devices AD7923 and similar ADC");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
index f658012baad8..ef013af1aec0 100644
--- a/drivers/iio/adc/ad799x.c
+++ b/drivers/iio/adc/ad799x.c
@@ -167,6 +167,21 @@ static int ad799x_read_config(struct ad799x_state *st)
 	}
 }
 
+static int ad799x_update_config(struct ad799x_state *st, u16 config)
+{
+	int ret;
+
+	ret = ad799x_write_config(st, config);
+	if (ret < 0)
+		return ret;
+	ret = ad799x_read_config(st);
+	if (ret < 0)
+		return ret;
+	st->config = ret;
+
+	return 0;
+}
+
 /**
  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
  *
@@ -808,13 +823,9 @@ static int ad799x_probe(struct i2c_client *client,
 	indio_dev->channels = st->chip_config->channel;
 	indio_dev->num_channels = chip_info->num_channels;
 
-	ret = ad799x_write_config(st, st->chip_config->default_config);
-	if (ret < 0)
-		goto error_disable_vref;
-	ret = ad799x_read_config(st);
-	if (ret < 0)
+	ret = ad799x_update_config(st, st->chip_config->default_config);
+	if (ret)
 		goto error_disable_vref;
-	st->config = ret;
 
 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
 		&ad799x_trigger_handler, NULL);
@@ -864,6 +875,48 @@ static int ad799x_remove(struct i2c_client *client)
 	return 0;
 }
 
+static int __maybe_unused ad799x_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct ad799x_state *st = iio_priv(indio_dev);
+
+	regulator_disable(st->vref);
+	regulator_disable(st->reg);
+
+	return 0;
+}
+
+static int __maybe_unused ad799x_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct ad799x_state *st = iio_priv(indio_dev);
+	int ret;
+
+	ret = regulator_enable(st->reg);
+	if (ret) {
+		dev_err(dev, "Unable to enable vcc regulator\n");
+		return ret;
+	}
+	ret = regulator_enable(st->vref);
+	if (ret) {
+		regulator_disable(st->reg);
+		dev_err(dev, "Unable to enable vref regulator\n");
+		return ret;
+	}
+
+	/* resync config */
+	ret = ad799x_update_config(st, st->config);
+	if (ret) {
+		regulator_disable(st->vref);
+		regulator_disable(st->reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
+
 static const struct i2c_device_id ad799x_id[] = {
 	{ "ad7991", ad7991 },
 	{ "ad7995", ad7995 },
@@ -881,6 +934,7 @@ MODULE_DEVICE_TABLE(i2c, ad799x_id);
 static struct i2c_driver ad799x_driver = {
 	.driver = {
 		.name = "ad799x",
+		.pm = &ad799x_pm_ops,
 	},
 	.probe = ad799x_probe,
 	.remove = ad799x_remove,
diff --git a/drivers/iio/adc/ltc2496.c b/drivers/iio/adc/ltc2496.c
new file mode 100644
index 000000000000..88a30156a849
--- /dev/null
+++ b/drivers/iio/adc/ltc2496.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ltc2496.c - Driver for Analog Devices/Linear Technology LTC2496 ADC
+ *
+ * Based on ltc2497.c which has
+ * Copyright (C) 2017 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ *
+ * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/2496fc.pdf
+ */
+
+#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "ltc2497.h"
+
+struct ltc2496_driverdata {
+	/* this must be the first member */
+	struct ltc2497core_driverdata common_ddata;
+	struct spi_device *spi;
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	unsigned char rxbuf[3] ____cacheline_aligned;
+	unsigned char txbuf[3];
+};
+
+static int ltc2496_result_and_measure(struct ltc2497core_driverdata *ddata,
+				      u8 address, int *val)
+{
+	struct ltc2496_driverdata *st =
+		container_of(ddata, struct ltc2496_driverdata, common_ddata);
+	struct spi_transfer t = {
+		.tx_buf = st->txbuf,
+		.rx_buf = st->rxbuf,
+		.len = sizeof(st->txbuf),
+	};
+	int ret;
+
+	st->txbuf[0] = LTC2497_ENABLE | address;
+
+	ret = spi_sync_transfer(st->spi, &t, 1);
+	if (ret < 0)  {
+		dev_err(&st->spi->dev, "spi_sync_transfer failed: %pe\n",
+			ERR_PTR(ret));
+		return ret;
+	}
+
+	if (val)
+		*val = ((st->rxbuf[0] & 0x3f) << 12 |
+			st->rxbuf[1] << 4 | st->rxbuf[2] >> 4) -
+			(1 << 17);
+
+	return 0;
+}
+
+static int ltc2496_probe(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev;
+	struct ltc2496_driverdata *st;
+	struct device *dev = &spi->dev;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	spi_set_drvdata(spi, indio_dev);
+	st->spi = spi;
+	st->common_ddata.result_and_measure = ltc2496_result_and_measure;
+
+	return ltc2497core_probe(dev, indio_dev);
+}
+
+static int ltc2496_remove(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev = spi_get_drvdata(spi);
+
+	ltc2497core_remove(indio_dev);
+
+	return 0;
+}
+
+static const struct of_device_id ltc2496_of_match[] = {
+	{ .compatible = "lltc,ltc2496", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ltc2496_of_match);
+
+static struct spi_driver ltc2496_driver = {
+	.driver = {
+		.name = "ltc2496",
+		.of_match_table = of_match_ptr(ltc2496_of_match),
+	},
+	.probe = ltc2496_probe,
+	.remove = ltc2496_remove,
+};
+module_spi_driver(ltc2496_driver);
+
+MODULE_AUTHOR("Uwe Kleine-König <u.kleine-könig@pengutronix.de>");
+MODULE_DESCRIPTION("Linear Technology LTC2496 ADC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ltc2497-core.c b/drivers/iio/adc/ltc2497-core.c
new file mode 100644
index 000000000000..f5f7039caacc
--- /dev/null
+++ b/drivers/iio/adc/ltc2497-core.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ltc2497-core.c - Common code for Analog Devices/Linear Technology
+ * LTC2496 and LTC2497 ADCs
+ *
+ * Copyright (C) 2017 Analog Devices Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+
+#include "ltc2497.h"
+
+#define LTC2497_SGL			BIT(4)
+#define LTC2497_DIFF			0
+#define LTC2497_SIGN			BIT(3)
+
+static int ltc2497core_wait_conv(struct ltc2497core_driverdata *ddata)
+{
+	s64 time_elapsed;
+
+	time_elapsed = ktime_ms_delta(ktime_get(), ddata->time_prev);
+
+	if (time_elapsed < LTC2497_CONVERSION_TIME_MS) {
+		/* delay if conversion time not passed
+		 * since last read or write
+		 */
+		if (msleep_interruptible(
+		    LTC2497_CONVERSION_TIME_MS - time_elapsed))
+			return -ERESTARTSYS;
+
+		return 0;
+	}
+
+	if (time_elapsed - LTC2497_CONVERSION_TIME_MS <= 0) {
+		/* We're in automatic mode -
+		 * so the last reading is still not outdated
+		 */
+		return 0;
+	}
+
+	return 1;
+}
+
+static int ltc2497core_read(struct ltc2497core_driverdata *ddata, u8 address, int *val)
+{
+	int ret;
+
+	ret = ltc2497core_wait_conv(ddata);
+	if (ret < 0)
+		return ret;
+
+	if (ret || ddata->addr_prev != address) {
+		ret = ddata->result_and_measure(ddata, address, NULL);
+		if (ret < 0)
+			return ret;
+		ddata->addr_prev = address;
+
+		if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS))
+			return -ERESTARTSYS;
+	}
+
+	ret = ddata->result_and_measure(ddata, address, val);
+	if (ret < 0)
+		return ret;
+
+	ddata->time_prev = ktime_get();
+
+	return ret;
+}
+
+static int ltc2497core_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&indio_dev->mlock);
+		ret = ltc2497core_read(ddata, chan->address, val);
+		mutex_unlock(&indio_dev->mlock);
+		if (ret < 0)
+			return ret;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		ret = regulator_get_voltage(ddata->ref);
+		if (ret < 0)
+			return ret;
+
+		*val = ret / 1000;
+		*val2 = 17;
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+#define LTC2497_CHAN(_chan, _addr, _ds_name) { \
+	.type = IIO_VOLTAGE, \
+	.indexed = 1, \
+	.channel = (_chan), \
+	.address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC2497_SIGN : 0)), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+	.datasheet_name = (_ds_name), \
+}
+
+#define LTC2497_CHAN_DIFF(_chan, _addr) { \
+	.type = IIO_VOLTAGE, \
+	.indexed = 1, \
+	.channel = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 1 : 0), \
+	.channel2 = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 0 : 1),\
+	.address = (_addr | _chan), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+	.differential = 1, \
+}
+
+static const struct iio_chan_spec ltc2497core_channel[] = {
+	LTC2497_CHAN(0, LTC2497_SGL, "CH0"),
+	LTC2497_CHAN(1, LTC2497_SGL, "CH1"),
+	LTC2497_CHAN(2, LTC2497_SGL, "CH2"),
+	LTC2497_CHAN(3, LTC2497_SGL, "CH3"),
+	LTC2497_CHAN(4, LTC2497_SGL, "CH4"),
+	LTC2497_CHAN(5, LTC2497_SGL, "CH5"),
+	LTC2497_CHAN(6, LTC2497_SGL, "CH6"),
+	LTC2497_CHAN(7, LTC2497_SGL, "CH7"),
+	LTC2497_CHAN(8, LTC2497_SGL, "CH8"),
+	LTC2497_CHAN(9, LTC2497_SGL, "CH9"),
+	LTC2497_CHAN(10, LTC2497_SGL, "CH10"),
+	LTC2497_CHAN(11, LTC2497_SGL, "CH11"),
+	LTC2497_CHAN(12, LTC2497_SGL, "CH12"),
+	LTC2497_CHAN(13, LTC2497_SGL, "CH13"),
+	LTC2497_CHAN(14, LTC2497_SGL, "CH14"),
+	LTC2497_CHAN(15, LTC2497_SGL, "CH15"),
+	LTC2497_CHAN_DIFF(0, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(1, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(2, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(3, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(4, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(5, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(6, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(7, LTC2497_DIFF),
+	LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN),
+	LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN),
+	LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN),
+	LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN),
+	LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN),
+	LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN),
+	LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN),
+	LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN),
+};
+
+static const struct iio_info ltc2497core_info = {
+	.read_raw = ltc2497core_read_raw,
+};
+
+int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev)
+{
+	struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
+	int ret;
+
+	indio_dev->dev.parent = dev;
+	indio_dev->name = dev_name(dev);
+	indio_dev->info = &ltc2497core_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = ltc2497core_channel;
+	indio_dev->num_channels = ARRAY_SIZE(ltc2497core_channel);
+
+	ret = ddata->result_and_measure(ddata, LTC2497_CONFIG_DEFAULT, NULL);
+	if (ret < 0)
+		return ret;
+
+	ddata->ref = devm_regulator_get(dev, "vref");
+	if (IS_ERR(ddata->ref)) {
+		if (PTR_ERR(ddata->ref) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get vref regulator: %pe\n",
+				ddata->ref);
+
+		return PTR_ERR(ddata->ref);
+	}
+
+	ret = regulator_enable(ddata->ref);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable vref regulator: %pe\n",
+			ERR_PTR(ret));
+		return ret;
+	}
+
+	if (dev->platform_data) {
+		struct iio_map *plat_data;
+
+		plat_data = (struct iio_map *)dev->platform_data;
+
+		ret = iio_map_array_register(indio_dev, plat_data);
+		if (ret) {
+			dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
+			goto err_regulator_disable;
+		}
+	}
+
+	ddata->addr_prev = LTC2497_CONFIG_DEFAULT;
+	ddata->time_prev = ktime_get();
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0)
+		goto err_array_unregister;
+
+	return 0;
+
+err_array_unregister:
+	iio_map_array_unregister(indio_dev);
+
+err_regulator_disable:
+	regulator_disable(ddata->ref);
+
+	return ret;
+}
+EXPORT_SYMBOL_NS(ltc2497core_probe, LTC2497);
+
+void ltc2497core_remove(struct iio_dev *indio_dev)
+{
+	struct ltc2497core_driverdata *ddata = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	iio_map_array_unregister(indio_dev);
+
+	regulator_disable(ddata->ref);
+}
+EXPORT_SYMBOL_NS(ltc2497core_remove, LTC2497);
+
+MODULE_DESCRIPTION("common code for LTC2496/LTC2497 drivers");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c
index 470406032720..5db63d7c6bc5 100644
--- a/drivers/iio/adc/ltc2497.c
+++ b/drivers/iio/adc/ltc2497.c
@@ -7,27 +7,18 @@
  * Datasheet: http://cds.linear.com/docs/en/datasheet/2497fd.pdf
  */
 
-#include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/driver.h>
-#include <linux/iio/sysfs.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/regulator/consumer.h>
 
-#define LTC2497_ENABLE			0xA0
-#define LTC2497_SGL			BIT(4)
-#define LTC2497_DIFF			0
-#define LTC2497_SIGN			BIT(3)
-#define LTC2497_CONFIG_DEFAULT		LTC2497_ENABLE
-#define LTC2497_CONVERSION_TIME_MS	150ULL
+#include "ltc2497.h"
 
-struct ltc2497_st {
+struct ltc2497_driverdata {
+	/* this must be the first member */
+	struct ltc2497core_driverdata common_ddata;
 	struct i2c_client *client;
-	struct regulator *ref;
-	ktime_t	time_prev;
-	u8 addr_prev;
 	/*
 	 * DMA (thus cache coherency maintenance) requires the
 	 * transfer buffers to live in their own cache lines.
@@ -35,232 +26,59 @@ struct ltc2497_st {
 	__be32 buf ____cacheline_aligned;
 };
 
-static int ltc2497_wait_conv(struct ltc2497_st *st)
+static int ltc2497_result_and_measure(struct ltc2497core_driverdata *ddata,
+				      u8 address, int *val)
 {
-	s64 time_elapsed;
-
-	time_elapsed = ktime_ms_delta(ktime_get(), st->time_prev);
-
-	if (time_elapsed < LTC2497_CONVERSION_TIME_MS) {
-		/* delay if conversion time not passed
-		 * since last read or write
-		 */
-		if (msleep_interruptible(
-		    LTC2497_CONVERSION_TIME_MS - time_elapsed))
-			return -ERESTARTSYS;
-
-		return 0;
-	}
-
-	if (time_elapsed - LTC2497_CONVERSION_TIME_MS <= 0) {
-		/* We're in automatic mode -
-		 * so the last reading is stil not outdated
-		 */
-		return 0;
-	}
-
-	return 1;
-}
-
-static int ltc2497_read(struct ltc2497_st *st, u8 address, int *val)
-{
-	struct i2c_client *client = st->client;
-	int ret;
-
-	ret = ltc2497_wait_conv(st);
-	if (ret < 0)
-		return ret;
-
-	if (ret || st->addr_prev != address) {
-		ret = i2c_smbus_write_byte(st->client,
-					   LTC2497_ENABLE | address);
-		if (ret < 0)
-			return ret;
-		st->addr_prev = address;
-		if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS))
-			return -ERESTARTSYS;
-	}
-	ret = i2c_master_recv(client, (char *)&st->buf, 3);
-	if (ret < 0)  {
-		dev_err(&client->dev, "i2c_master_recv failed\n");
-		return ret;
-	}
-	st->time_prev = ktime_get();
-
-	/* convert and shift the result,
-	 * and finally convert from offset binary to signed integer
-	 */
-	*val = (be32_to_cpu(st->buf) >> 14) - (1 << 17);
-
-	return ret;
-}
-
-static int ltc2497_read_raw(struct iio_dev *indio_dev,
-			    struct iio_chan_spec const *chan,
-			    int *val, int *val2, long mask)
-{
-	struct ltc2497_st *st = iio_priv(indio_dev);
+	struct ltc2497_driverdata *st =
+		container_of(ddata, struct ltc2497_driverdata, common_ddata);
 	int ret;
 
-	switch (mask) {
-	case IIO_CHAN_INFO_RAW:
-		mutex_lock(&indio_dev->mlock);
-		ret = ltc2497_read(st, chan->address, val);
-		mutex_unlock(&indio_dev->mlock);
-		if (ret < 0)
-			return ret;
-
-		return IIO_VAL_INT;
-
-	case IIO_CHAN_INFO_SCALE:
-		ret = regulator_get_voltage(st->ref);
-		if (ret < 0)
+	if (val) {
+		ret = i2c_master_recv(st->client, (char *)&st->buf, 3);
+		if (ret < 0) {
+			dev_err(&st->client->dev, "i2c_master_recv failed\n");
 			return ret;
+		}
 
-		*val = ret / 1000;
-		*val2 = 17;
-
-		return IIO_VAL_FRACTIONAL_LOG2;
-
-	default:
-		return -EINVAL;
+		*val = (be32_to_cpu(st->buf) >> 14) - (1 << 17);
 	}
-}
 
-#define LTC2497_CHAN(_chan, _addr, _ds_name) { \
-	.type = IIO_VOLTAGE, \
-	.indexed = 1, \
-	.channel = (_chan), \
-	.address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC2497_SIGN : 0)), \
-	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
-	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
-	.datasheet_name = (_ds_name), \
-}
-
-#define LTC2497_CHAN_DIFF(_chan, _addr) { \
-	.type = IIO_VOLTAGE, \
-	.indexed = 1, \
-	.channel = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 1 : 0), \
-	.channel2 = (_chan) * 2 + ((_addr) & LTC2497_SIGN ? 0 : 1),\
-	.address = (_addr | _chan), \
-	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
-	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
-	.differential = 1, \
+	ret = i2c_smbus_write_byte(st->client,
+				   LTC2497_ENABLE | address);
+	if (ret)
+		dev_err(&st->client->dev, "i2c transfer failed: %pe\n",
+			ERR_PTR(ret));
+	return ret;
 }
 
-static const struct iio_chan_spec ltc2497_channel[] = {
-	LTC2497_CHAN(0, LTC2497_SGL, "CH0"),
-	LTC2497_CHAN(1, LTC2497_SGL, "CH1"),
-	LTC2497_CHAN(2, LTC2497_SGL, "CH2"),
-	LTC2497_CHAN(3, LTC2497_SGL, "CH3"),
-	LTC2497_CHAN(4, LTC2497_SGL, "CH4"),
-	LTC2497_CHAN(5, LTC2497_SGL, "CH5"),
-	LTC2497_CHAN(6, LTC2497_SGL, "CH6"),
-	LTC2497_CHAN(7, LTC2497_SGL, "CH7"),
-	LTC2497_CHAN(8, LTC2497_SGL, "CH8"),
-	LTC2497_CHAN(9, LTC2497_SGL, "CH9"),
-	LTC2497_CHAN(10, LTC2497_SGL, "CH10"),
-	LTC2497_CHAN(11, LTC2497_SGL, "CH11"),
-	LTC2497_CHAN(12, LTC2497_SGL, "CH12"),
-	LTC2497_CHAN(13, LTC2497_SGL, "CH13"),
-	LTC2497_CHAN(14, LTC2497_SGL, "CH14"),
-	LTC2497_CHAN(15, LTC2497_SGL, "CH15"),
-	LTC2497_CHAN_DIFF(0, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(1, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(2, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(3, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(4, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(5, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(6, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(7, LTC2497_DIFF),
-	LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN),
-	LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN),
-	LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN),
-	LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN),
-	LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN),
-	LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN),
-	LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN),
-	LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN),
-};
-
-static const struct iio_info ltc2497_info = {
-	.read_raw = ltc2497_read_raw,
-};
-
 static int ltc2497_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct iio_dev *indio_dev;
-	struct ltc2497_st *st;
-	struct iio_map *plat_data;
-	int ret;
+	struct ltc2497_driverdata *st;
+	struct device *dev = &client->dev;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
 				     I2C_FUNC_SMBUS_WRITE_BYTE))
 		return -EOPNOTSUPP;
 
-	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 	if (!indio_dev)
 		return -ENOMEM;
 
 	st = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	st->client = client;
+	st->common_ddata.result_and_measure = ltc2497_result_and_measure;
 
-	indio_dev->dev.parent = &client->dev;
-	indio_dev->name = id->name;
-	indio_dev->info = &ltc2497_info;
-	indio_dev->modes = INDIO_DIRECT_MODE;
-	indio_dev->channels = ltc2497_channel;
-	indio_dev->num_channels = ARRAY_SIZE(ltc2497_channel);
-
-	st->ref = devm_regulator_get(&client->dev, "vref");
-	if (IS_ERR(st->ref))
-		return PTR_ERR(st->ref);
-
-	ret = regulator_enable(st->ref);
-	if (ret < 0)
-		return ret;
-
-	if (client->dev.platform_data) {
-		plat_data = ((struct iio_map *)client->dev.platform_data);
-		ret = iio_map_array_register(indio_dev, plat_data);
-		if (ret) {
-			dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
-			goto err_regulator_disable;
-		}
-	}
-
-	ret = i2c_smbus_write_byte(st->client, LTC2497_CONFIG_DEFAULT);
-	if (ret < 0)
-		goto err_array_unregister;
-
-	st->addr_prev = LTC2497_CONFIG_DEFAULT;
-	st->time_prev = ktime_get();
-
-	ret = iio_device_register(indio_dev);
-	if (ret < 0)
-		goto err_array_unregister;
-
-	return 0;
-
-err_array_unregister:
-	iio_map_array_unregister(indio_dev);
-
-err_regulator_disable:
-	regulator_disable(st->ref);
-
-	return ret;
+	return ltc2497core_probe(dev, indio_dev);
 }
 
 static int ltc2497_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-	struct ltc2497_st *st = iio_priv(indio_dev);
 
-	iio_map_array_unregister(indio_dev);
-	iio_device_unregister(indio_dev);
-	regulator_disable(st->ref);
+	ltc2497core_remove(indio_dev);
 
 	return 0;
 }
diff --git a/drivers/iio/adc/ltc2497.h b/drivers/iio/adc/ltc2497.h
new file mode 100644
index 000000000000..d0b42dd6b8ad
--- /dev/null
+++ b/drivers/iio/adc/ltc2497.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define LTC2497_ENABLE			0xA0
+#define LTC2497_CONFIG_DEFAULT		LTC2497_ENABLE
+#define LTC2497_CONVERSION_TIME_MS	150ULL
+
+struct ltc2497core_driverdata {
+	struct regulator *ref;
+	ktime_t	time_prev;
+	u8 addr_prev;
+	int (*result_and_measure)(struct ltc2497core_driverdata *ddata,
+				  u8 address, int *val);
+};
+
+int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev);
+void ltc2497core_remove(struct iio_dev *indio_dev);
+
+MODULE_IMPORT_NS(LTC2497);
diff --git a/drivers/iio/adc/max9611.c b/drivers/iio/adc/max9611.c
index e480529b3f04..04d5ff7d2c8e 100644
--- a/drivers/iio/adc/max9611.c
+++ b/drivers/iio/adc/max9611.c
@@ -115,22 +115,17 @@ enum max9611_conf_ids {
  *		      where data shall be read from
  */
 static const unsigned int max9611_mux_conf[][2] = {
-	/* CONF_SENSE_1x */
-	{ MAX9611_MUX_SENSE_1x, MAX9611_REG_CSA_DATA },
-	/* CONF_SENSE_4x */
-	{ MAX9611_MUX_SENSE_4x, MAX9611_REG_CSA_DATA },
-	/* CONF_SENSE_8x */
-	{ MAX9611_MUX_SENSE_8x, MAX9611_REG_CSA_DATA },
-	/* CONF_IN_VOLT */
-	{ MAX9611_INPUT_VOLT, MAX9611_REG_RS_DATA },
-	/* CONF_TEMP */
-	{ MAX9611_MUX_TEMP, MAX9611_REG_TEMP_DATA },
+	[CONF_SENSE_1x]	= { MAX9611_MUX_SENSE_1x, MAX9611_REG_CSA_DATA },
+	[CONF_SENSE_4x]	= { MAX9611_MUX_SENSE_4x, MAX9611_REG_CSA_DATA },
+	[CONF_SENSE_8x]	= { MAX9611_MUX_SENSE_8x, MAX9611_REG_CSA_DATA },
+	[CONF_IN_VOLT]	= { MAX9611_INPUT_VOLT, MAX9611_REG_RS_DATA },
+	[CONF_TEMP]	= { MAX9611_MUX_TEMP, MAX9611_REG_TEMP_DATA },
 };
 
 enum max9611_csa_gain {
-	CSA_GAIN_1x,
-	CSA_GAIN_4x,
-	CSA_GAIN_8x,
+	CSA_GAIN_1x = CONF_SENSE_1x,
+	CSA_GAIN_4x = CONF_SENSE_4x,
+	CSA_GAIN_8x = CONF_SENSE_8x,
 };
 
 enum max9611_csa_gain_params {
@@ -148,18 +143,9 @@ enum max9611_csa_gain_params {
  * value; use this structure to retrieve the correct LSB and offset values.
  */
 static const unsigned int max9611_gain_conf[][2] = {
-	{ /* [0] CSA_GAIN_1x */
-		MAX9611_CSA_1X_LSB_nV,
-		MAX9611_CSA_1X_OFFS_RAW,
-	},
-	{ /* [1] CSA_GAIN_4x */
-		MAX9611_CSA_4X_LSB_nV,
-		MAX9611_CSA_4X_OFFS_RAW,
-	},
-	{ /* [2] CSA_GAIN_8x */
-		MAX9611_CSA_8X_LSB_nV,
-		MAX9611_CSA_8X_OFFS_RAW,
-	},
+	[CSA_GAIN_1x] = { MAX9611_CSA_1X_LSB_nV, MAX9611_CSA_1X_OFFS_RAW, },
+	[CSA_GAIN_4x] = { MAX9611_CSA_4X_LSB_nV, MAX9611_CSA_4X_OFFS_RAW, },
+	[CSA_GAIN_8x] = { MAX9611_CSA_8X_LSB_nV, MAX9611_CSA_8X_OFFS_RAW, },
 };
 
 enum max9611_chan_addrs {
diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
index 6537f4f776c5..97655d7fc11a 100644
--- a/drivers/iio/adc/stm32-adc-core.c
+++ b/drivers/iio/adc/stm32-adc-core.c
@@ -280,21 +280,21 @@ out:
 static const struct stm32_adc_common_regs stm32f4_adc_common_regs = {
 	.csr = STM32F4_ADC_CSR,
 	.ccr = STM32F4_ADC_CCR,
-	.eoc1_msk = STM32F4_EOC1,
-	.eoc2_msk = STM32F4_EOC2,
-	.eoc3_msk = STM32F4_EOC3,
+	.eoc1_msk = STM32F4_EOC1 | STM32F4_OVR1,
+	.eoc2_msk = STM32F4_EOC2 | STM32F4_OVR2,
+	.eoc3_msk = STM32F4_EOC3 | STM32F4_OVR3,
 	.ier = STM32F4_ADC_CR1,
-	.eocie_msk = STM32F4_EOCIE,
+	.eocie_msk = STM32F4_EOCIE | STM32F4_OVRIE,
 };
 
 /* STM32H7 common registers definitions */
 static const struct stm32_adc_common_regs stm32h7_adc_common_regs = {
 	.csr = STM32H7_ADC_CSR,
 	.ccr = STM32H7_ADC_CCR,
-	.eoc1_msk = STM32H7_EOC_MST,
-	.eoc2_msk = STM32H7_EOC_SLV,
+	.eoc1_msk = STM32H7_EOC_MST | STM32H7_OVR_MST,
+	.eoc2_msk = STM32H7_EOC_SLV | STM32H7_OVR_SLV,
 	.ier = STM32H7_ADC_IER,
-	.eocie_msk = STM32H7_EOCIE,
+	.eocie_msk = STM32H7_EOCIE | STM32H7_OVRIE,
 };
 
 static const unsigned int stm32_adc_offset[STM32_ADC_MAX_ADCS] = {
diff --git a/drivers/iio/adc/stm32-adc-core.h b/drivers/iio/adc/stm32-adc-core.h
index 2579d514c2a3..2322809bfd2f 100644
--- a/drivers/iio/adc/stm32-adc-core.h
+++ b/drivers/iio/adc/stm32-adc-core.h
@@ -51,10 +51,12 @@
 #define STM32F4_ADC_CCR			(STM32_ADCX_COMN_OFFSET + 0x04)
 
 /* STM32F4_ADC_SR - bit fields */
+#define STM32F4_OVR			BIT(5)
 #define STM32F4_STRT			BIT(4)
 #define STM32F4_EOC			BIT(1)
 
 /* STM32F4_ADC_CR1 - bit fields */
+#define STM32F4_OVRIE			BIT(26)
 #define STM32F4_RES_SHIFT		24
 #define STM32F4_RES_MASK		GENMASK(25, 24)
 #define STM32F4_SCAN			BIT(8)
@@ -72,8 +74,11 @@
 #define STM32F4_ADON			BIT(0)
 
 /* STM32F4_ADC_CSR - bit fields */
+#define STM32F4_OVR3			BIT(21)
 #define STM32F4_EOC3			BIT(17)
+#define STM32F4_OVR2			BIT(13)
 #define STM32F4_EOC2			BIT(9)
+#define STM32F4_OVR1			BIT(5)
 #define STM32F4_EOC1			BIT(1)
 
 /* STM32F4_ADC_CCR - bit fields */
@@ -103,10 +108,12 @@
 
 /* STM32H7_ADC_ISR - bit fields */
 #define STM32MP1_VREGREADY		BIT(12)
+#define STM32H7_OVR			BIT(4)
 #define STM32H7_EOC			BIT(2)
 #define STM32H7_ADRDY			BIT(0)
 
 /* STM32H7_ADC_IER - bit fields */
+#define STM32H7_OVRIE			STM32H7_OVR
 #define STM32H7_EOCIE			STM32H7_EOC
 
 /* STM32H7_ADC_CR - bit fields */
@@ -155,7 +162,9 @@ enum stm32h7_adc_dmngt {
 #define STM32H7_LINCALFACT_MASK		GENMASK(29, 0)
 
 /* STM32H7_ADC_CSR - bit fields */
+#define STM32H7_OVR_SLV			BIT(20)
 #define STM32H7_EOC_SLV			BIT(18)
+#define STM32H7_OVR_MST			BIT(4)
 #define STM32H7_EOC_MST			BIT(2)
 
 /* STM32H7_ADC_CCR - bit fields */
diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index 3b291d72701c..5f05bf9f16ea 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -117,7 +117,9 @@ struct stm32_adc_regs {
  * struct stm32_adc_regspec - stm32 registers definition
  * @dr:			data register offset
  * @ier_eoc:		interrupt enable register & eocie bitfield
+ * @ier_ovr:		interrupt enable register & overrun bitfield
  * @isr_eoc:		interrupt status register & eoc bitfield
+ * @isr_ovr:		interrupt status register & overrun bitfield
  * @sqr:		reference to sequence registers array
  * @exten:		trigger control register & bitfield
  * @extsel:		trigger selection register & bitfield
@@ -128,7 +130,9 @@ struct stm32_adc_regs {
 struct stm32_adc_regspec {
 	const u32 dr;
 	const struct stm32_adc_regs ier_eoc;
+	const struct stm32_adc_regs ier_ovr;
 	const struct stm32_adc_regs isr_eoc;
+	const struct stm32_adc_regs isr_ovr;
 	const struct stm32_adc_regs *sqr;
 	const struct stm32_adc_regs exten;
 	const struct stm32_adc_regs extsel;
@@ -337,7 +341,9 @@ static const unsigned int stm32f4_adc_smp_cycles[STM32_ADC_MAX_SMP + 1] = {
 static const struct stm32_adc_regspec stm32f4_adc_regspec = {
 	.dr = STM32F4_ADC_DR,
 	.ier_eoc = { STM32F4_ADC_CR1, STM32F4_EOCIE },
+	.ier_ovr = { STM32F4_ADC_CR1, STM32F4_OVRIE },
 	.isr_eoc = { STM32F4_ADC_SR, STM32F4_EOC },
+	.isr_ovr = { STM32F4_ADC_SR, STM32F4_OVR },
 	.sqr = stm32f4_sq,
 	.exten = { STM32F4_ADC_CR2, STM32F4_EXTEN_MASK, STM32F4_EXTEN_SHIFT },
 	.extsel = { STM32F4_ADC_CR2, STM32F4_EXTSEL_MASK,
@@ -429,7 +435,9 @@ static const unsigned int stm32h7_adc_smp_cycles[STM32_ADC_MAX_SMP + 1] = {
 static const struct stm32_adc_regspec stm32h7_adc_regspec = {
 	.dr = STM32H7_ADC_DR,
 	.ier_eoc = { STM32H7_ADC_IER, STM32H7_EOCIE },
+	.ier_ovr = { STM32H7_ADC_IER, STM32H7_OVRIE },
 	.isr_eoc = { STM32H7_ADC_ISR, STM32H7_EOC },
+	.isr_ovr = { STM32H7_ADC_ISR, STM32H7_OVR },
 	.sqr = stm32h7_sq,
 	.exten = { STM32H7_ADC_CFGR, STM32H7_EXTEN_MASK, STM32H7_EXTEN_SHIFT },
 	.extsel = { STM32H7_ADC_CFGR, STM32H7_EXTSEL_MASK,
@@ -506,6 +514,18 @@ static void stm32_adc_conv_irq_disable(struct stm32_adc *adc)
 			   adc->cfg->regs->ier_eoc.mask);
 }
 
+static void stm32_adc_ovr_irq_enable(struct stm32_adc *adc)
+{
+	stm32_adc_set_bits(adc, adc->cfg->regs->ier_ovr.reg,
+			   adc->cfg->regs->ier_ovr.mask);
+}
+
+static void stm32_adc_ovr_irq_disable(struct stm32_adc *adc)
+{
+	stm32_adc_clr_bits(adc, adc->cfg->regs->ier_ovr.reg,
+			   adc->cfg->regs->ier_ovr.mask);
+}
+
 static void stm32_adc_set_res(struct stm32_adc *adc)
 {
 	const struct stm32_adc_regs *res = &adc->cfg->regs->res;
@@ -1205,6 +1225,19 @@ static int stm32_adc_read_raw(struct iio_dev *indio_dev,
 	}
 }
 
+static irqreturn_t stm32_adc_threaded_isr(int irq, void *data)
+{
+	struct stm32_adc *adc = data;
+	struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+	const struct stm32_adc_regspec *regs = adc->cfg->regs;
+	u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);
+
+	if (status & regs->isr_ovr.mask)
+		dev_err(&indio_dev->dev, "Overrun, stopping: restart needed\n");
+
+	return IRQ_HANDLED;
+}
+
 static irqreturn_t stm32_adc_isr(int irq, void *data)
 {
 	struct stm32_adc *adc = data;
@@ -1212,6 +1245,19 @@ static irqreturn_t stm32_adc_isr(int irq, void *data)
 	const struct stm32_adc_regspec *regs = adc->cfg->regs;
 	u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);
 
+	if (status & regs->isr_ovr.mask) {
+		/*
+		 * Overrun occurred on regular conversions: data for wrong
+		 * channel may be read. Unconditionally disable interrupts
+		 * to stop processing data and print error message.
+		 * Restarting the capture can be done by disabling, then
+		 * re-enabling it (e.g. write 0, then 1 to buffer/enable).
+		 */
+		stm32_adc_ovr_irq_disable(adc);
+		stm32_adc_conv_irq_disable(adc);
+		return IRQ_WAKE_THREAD;
+	}
+
 	if (status & regs->isr_eoc.mask) {
 		/* Reading DR also clears EOC status flag */
 		adc->buffer[adc->bufi] = stm32_adc_readw(adc, regs->dr);
@@ -1441,6 +1487,8 @@ static int __stm32_adc_buffer_postenable(struct iio_dev *indio_dev)
 	/* Reset adc buffer index */
 	adc->bufi = 0;
 
+	stm32_adc_ovr_irq_enable(adc);
+
 	if (!adc->dma_chan)
 		stm32_adc_conv_irq_enable(adc);
 
@@ -1481,6 +1529,8 @@ static void __stm32_adc_buffer_predisable(struct iio_dev *indio_dev)
 	if (!adc->dma_chan)
 		stm32_adc_conv_irq_disable(adc);
 
+	stm32_adc_ovr_irq_disable(adc);
+
 	if (adc->dma_chan)
 		dmaengine_terminate_sync(adc->dma_chan);
 
@@ -1818,8 +1868,9 @@ static int stm32_adc_probe(struct platform_device *pdev)
 	if (adc->irq < 0)
 		return adc->irq;
 
-	ret = devm_request_irq(&pdev->dev, adc->irq, stm32_adc_isr,
-			       0, pdev->name, adc);
+	ret = devm_request_threaded_irq(&pdev->dev, adc->irq, stm32_adc_isr,
+					stm32_adc_threaded_isr,
+					0, pdev->name, adc);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to request IRQ\n");
 		return ret;
diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
index a550b132cfb7..5ea4f45d6bad 100644
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -12,17 +12,15 @@
  */
 
 #include <linux/module.h>
-#include <linux/of_device.h>
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/i2c.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/pm_runtime.h>
 #include <linux/mutex.h>
 #include <linux/delay.h>
 
-#include <linux/platform_data/ads1015.h>
-
 #include <linux/iio/iio.h>
 #include <linux/iio/types.h>
 #include <linux/iio/sysfs.h>
@@ -33,6 +31,8 @@
 
 #define ADS1015_DRV_NAME "ads1015"
 
+#define ADS1015_CHANNELS 8
+
 #define ADS1015_CONV_REG	0x00
 #define ADS1015_CFG_REG		0x01
 #define ADS1015_LO_THRESH_REG	0x02
@@ -77,6 +77,7 @@
 #define ADS1015_DEFAULT_CHAN		0
 
 enum chip_ids {
+	ADSXXXX = 0,
 	ADS1015,
 	ADS1115,
 };
@@ -219,6 +220,12 @@ static const struct iio_event_spec ads1015_events[] = {
 	.datasheet_name = "AIN"#_chan"-AIN"#_chan2,		\
 }
 
+struct ads1015_channel_data {
+	bool enabled;
+	unsigned int pga;
+	unsigned int data_rate;
+};
+
 struct ads1015_thresh_data {
 	unsigned int comp_queue;
 	int high_thresh;
@@ -837,65 +844,58 @@ static const struct iio_info ads1115_info = {
 	.attrs          = &ads1115_attribute_group,
 };
 
-#ifdef CONFIG_OF
-static int ads1015_get_channels_config_of(struct i2c_client *client)
+static int ads1015_client_get_channels_config(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct ads1015_data *data = iio_priv(indio_dev);
-	struct device_node *node;
+	struct device *dev = &client->dev;
+	struct fwnode_handle *node;
+	int i = -1;
 
-	if (!client->dev.of_node ||
-	    !of_get_next_child(client->dev.of_node, NULL))
-		return -EINVAL;
-
-	for_each_child_of_node(client->dev.of_node, node) {
+	device_for_each_child_node(dev, node) {
 		u32 pval;
 		unsigned int channel;
 		unsigned int pga = ADS1015_DEFAULT_PGA;
 		unsigned int data_rate = ADS1015_DEFAULT_DATA_RATE;
 
-		if (of_property_read_u32(node, "reg", &pval)) {
-			dev_err(&client->dev, "invalid reg on %pOF\n",
-				node);
+		if (fwnode_property_read_u32(node, "reg", &pval)) {
+			dev_err(dev, "invalid reg on %pfw\n", node);
 			continue;
 		}
 
 		channel = pval;
 		if (channel >= ADS1015_CHANNELS) {
-			dev_err(&client->dev,
-				"invalid channel index %d on %pOF\n",
+			dev_err(dev, "invalid channel index %d on %pfw\n",
 				channel, node);
 			continue;
 		}
 
-		if (!of_property_read_u32(node, "ti,gain", &pval)) {
+		if (!fwnode_property_read_u32(node, "ti,gain", &pval)) {
 			pga = pval;
 			if (pga > 6) {
-				dev_err(&client->dev, "invalid gain on %pOF\n",
-					node);
-				of_node_put(node);
+				dev_err(dev, "invalid gain on %pfw\n", node);
+				fwnode_handle_put(node);
 				return -EINVAL;
 			}
 		}
 
-		if (!of_property_read_u32(node, "ti,datarate", &pval)) {
+		if (!fwnode_property_read_u32(node, "ti,datarate", &pval)) {
 			data_rate = pval;
 			if (data_rate > 7) {
-				dev_err(&client->dev,
-					"invalid data_rate on %pOF\n",
-					node);
-				of_node_put(node);
+				dev_err(dev, "invalid data_rate on %pfw\n", node);
+				fwnode_handle_put(node);
 				return -EINVAL;
 			}
 		}
 
 		data->channel_data[channel].pga = pga;
 		data->channel_data[channel].data_rate = data_rate;
+
+		i++;
 	}
 
-	return 0;
+	return i < 0 ? -EINVAL : 0;
 }
-#endif
 
 static void ads1015_get_channels_config(struct i2c_client *client)
 {
@@ -903,19 +903,10 @@ static void ads1015_get_channels_config(struct i2c_client *client)
 
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct ads1015_data *data = iio_priv(indio_dev);
-	struct ads1015_platform_data *pdata = dev_get_platdata(&client->dev);
 
-	/* prefer platform data */
-	if (pdata) {
-		memcpy(data->channel_data, pdata->channel_data,
-		       sizeof(data->channel_data));
+	if (!ads1015_client_get_channels_config(client))
 		return;
-	}
 
-#ifdef CONFIG_OF
-	if (!ads1015_get_channels_config_of(client))
-		return;
-#endif
 	/* fallback on default configuration */
 	for (k = 0; k < ADS1015_CHANNELS; ++k) {
 		data->channel_data[k].pga = ADS1015_DEFAULT_PGA;
@@ -953,9 +944,8 @@ static int ads1015_probe(struct i2c_client *client,
 	indio_dev->name = ADS1015_DRV_NAME;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	if (client->dev.of_node)
-		chip = (enum chip_ids)of_device_get_match_data(&client->dev);
-	else
+	chip = (enum chip_ids)device_get_match_data(&client->dev);
+	if (chip == ADSXXXX)
 		chip = id->driver_data;
 	switch (chip) {
 	case ADS1015:
@@ -970,6 +960,9 @@ static int ads1015_probe(struct i2c_client *client,
 		indio_dev->info = &ads1115_info;
 		data->data_rate = (unsigned int *) &ads1115_data_rate;
 		break;
+	default:
+		dev_err(&client->dev, "Unknown chip %d\n", chip);
+		return -EINVAL;
 	}
 
 	data->event_channel = ADS1015_CHANNELS;
diff --git a/drivers/iio/adc/ti-ads7950.c b/drivers/iio/adc/ti-ads7950.c
index 2e66e4d586ff..f9edc1207f75 100644
--- a/drivers/iio/adc/ti-ads7950.c
+++ b/drivers/iio/adc/ti-ads7950.c
@@ -602,7 +602,7 @@ static int ti_ads7950_probe(struct spi_device *spi)
 
 	st->reg = devm_regulator_get(&spi->dev, "vref");
 	if (IS_ERR(st->reg)) {
-		dev_err(&spi->dev, "Failed get get regulator \"vref\"\n");
+		dev_err(&spi->dev, "Failed to get regulator \"vref\"\n");
 		ret = PTR_ERR(st->reg);
 		goto error_destroy_mutex;
 	}
diff --git a/drivers/iio/buffer/industrialio-buffer-dma.c b/drivers/iio/buffer/industrialio-buffer-dma.c
index 90cf6e586b10..a74bd9c0587c 100644
--- a/drivers/iio/buffer/industrialio-buffer-dma.c
+++ b/drivers/iio/buffer/industrialio-buffer-dma.c
@@ -476,7 +476,7 @@ static struct iio_dma_buffer_block *iio_dma_buffer_dequeue(
  * @n: Number of bytes to read
  * @user_buffer: Userspace buffer to copy the data to
  *
- * Should be used as the read_first_n callback for iio_buffer_access_ops
+ * Should be used as the read callback for iio_buffer_access_ops
  * struct for DMA buffers.
  */
 int iio_dma_buffer_read(struct iio_buffer *buffer, size_t n,
diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
index bea4a75e92f1..b129693af0fd 100644
--- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
+++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
@@ -10,8 +10,10 @@
 #include <linux/dma-mapping.h>
 #include <linux/spinlock.h>
 #include <linux/err.h>
+#include <linux/module.h>
 
 #include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/buffer_impl.h>
 #include <linux/iio/buffer-dma.h>
@@ -107,7 +109,7 @@ static void iio_dmaengine_buffer_release(struct iio_buffer *buf)
 }
 
 static const struct iio_buffer_access_funcs iio_dmaengine_buffer_ops = {
-	.read_first_n = iio_dma_buffer_read,
+	.read = iio_dma_buffer_read,
 	.set_bytes_per_datum = iio_dma_buffer_set_bytes_per_datum,
 	.set_length = iio_dma_buffer_set_length,
 	.request_update = iio_dma_buffer_request_update,
@@ -125,6 +127,24 @@ static const struct iio_dma_buffer_ops iio_dmaengine_default_ops = {
 	.abort = iio_dmaengine_buffer_abort,
 };
 
+static ssize_t iio_dmaengine_buffer_get_length_align(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct dmaengine_buffer *dmaengine_buffer =
+		iio_buffer_to_dmaengine_buffer(indio_dev->buffer);
+
+	return sprintf(buf, "%u\n", dmaengine_buffer->align);
+}
+
+static IIO_DEVICE_ATTR(length_align_bytes, 0444,
+		       iio_dmaengine_buffer_get_length_align, NULL, 0);
+
+static const struct attribute *iio_dmaengine_buffer_attrs[] = {
+	&iio_dev_attr_length_align_bytes.dev_attr.attr,
+	NULL,
+};
+
 /**
  * iio_dmaengine_buffer_alloc() - Allocate new buffer which uses DMAengine
  * @dev: Parent device for the buffer
@@ -150,7 +170,7 @@ struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
 	if (!dmaengine_buffer)
 		return ERR_PTR(-ENOMEM);
 
-	chan = dma_request_slave_channel_reason(dev, channel);
+	chan = dma_request_chan(dev, channel);
 	if (IS_ERR(chan)) {
 		ret = PTR_ERR(chan);
 		goto err_free;
@@ -178,6 +198,8 @@ struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
 
 	iio_dma_buffer_init(&dmaengine_buffer->queue, chan->device->dev,
 		&iio_dmaengine_default_ops);
+	iio_buffer_set_attrs(&dmaengine_buffer->queue.buffer,
+		iio_dmaengine_buffer_attrs);
 
 	dmaengine_buffer->queue.buffer.access = &iio_dmaengine_buffer_ops;
 
@@ -206,3 +228,7 @@ void iio_dmaengine_buffer_free(struct iio_buffer *buffer)
 	iio_buffer_put(buffer);
 }
 EXPORT_SYMBOL_GPL(iio_dmaengine_buffer_free);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("DMA buffer for the IIO framework");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/buffer/kfifo_buf.c b/drivers/iio/buffer/kfifo_buf.c
index e78fc0834e6b..3150f8ab984b 100644
--- a/drivers/iio/buffer/kfifo_buf.c
+++ b/drivers/iio/buffer/kfifo_buf.c
@@ -98,8 +98,7 @@ static int iio_store_to_kfifo(struct iio_buffer *r,
 	return 0;
 }
 
-static int iio_read_first_n_kfifo(struct iio_buffer *r,
-			   size_t n, char __user *buf)
+static int iio_read_kfifo(struct iio_buffer *r, size_t n, char __user *buf)
 {
 	int ret, copied;
 	struct iio_kfifo *kf = iio_to_kfifo(r);
@@ -141,7 +140,7 @@ static void iio_kfifo_buffer_release(struct iio_buffer *buffer)
 
 static const struct iio_buffer_access_funcs kfifo_access_funcs = {
 	.store_to = &iio_store_to_kfifo,
-	.read_first_n = &iio_read_first_n_kfifo,
+	.read = &iio_read_kfifo,
 	.data_available = iio_kfifo_buf_data_available,
 	.request_update = &iio_request_update_kfifo,
 	.set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo,
diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile
index f97270bc4034..33d3a595dda9 100644
--- a/drivers/iio/chemical/Makefile
+++ b/drivers/iio/chemical/Makefile
@@ -4,7 +4,7 @@
 #
 
 # When adding new entries keep the list in alphabetical order
-obj-$(CONFIG_ATLAS_PH_SENSOR)	+= atlas-ph-sensor.o
+obj-$(CONFIG_ATLAS_PH_SENSOR)	+= atlas-sensor.o
 obj-$(CONFIG_BME680) += bme680_core.o
 obj-$(CONFIG_BME680_I2C) += bme680_i2c.o
 obj-$(CONFIG_BME680_SPI) += bme680_spi.o
diff --git a/drivers/iio/chemical/atlas-ph-sensor.c b/drivers/iio/chemical/atlas-sensor.c
index 6c175eb1c7a7..99095c80531b 100644
--- a/drivers/iio/chemical/atlas-ph-sensor.c
+++ b/drivers/iio/chemical/atlas-sensor.c
@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * atlas-ph-sensor.c - Support for Atlas Scientific OEM pH-SM sensor
+ * atlas-sensor.c - Support for Atlas Scientific OEM SM sensors
  *
- * Copyright (C) 2015-2018 Matt Ranostay
+ * Copyright (C) 2015-2019 Konsulko Group
  * Author: Matt Ranostay <matt.ranostay@konsulko.com>
  */
 
@@ -14,7 +14,6 @@
 #include <linux/err.h>
 #include <linux/irq.h>
 #include <linux/irq_work.h>
-#include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
@@ -25,8 +24,8 @@
 #include <linux/iio/triggered_buffer.h>
 #include <linux/pm_runtime.h>
 
-#define ATLAS_REGMAP_NAME	"atlas_ph_regmap"
-#define ATLAS_DRV_NAME		"atlas_ph"
+#define ATLAS_REGMAP_NAME	"atlas_regmap"
+#define ATLAS_DRV_NAME		"atlas"
 
 #define ATLAS_REG_DEV_TYPE		0x00
 #define ATLAS_REG_DEV_VERSION		0x01
@@ -681,5 +680,5 @@ static struct i2c_driver atlas_driver = {
 module_i2c_driver(atlas_driver);
 
 MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
-MODULE_DESCRIPTION("Atlas Scientific pH-SM sensor");
+MODULE_DESCRIPTION("Atlas Scientific SM sensors");
 MODULE_LICENSE("GPL");
diff --git a/drivers/iio/common/ssp_sensors/ssp.h b/drivers/iio/common/ssp_sensors/ssp.h
index 0a381bb1ae6f..abb832795619 100644
--- a/drivers/iio/common/ssp_sensors/ssp.h
+++ b/drivers/iio/common/ssp_sensors/ssp.h
@@ -7,7 +7,7 @@
 #define __SSP_SENSORHUB_H__
 
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/iio/common/ssp_sensors.h>
 #include <linux/iio/iio.h>
 #include <linux/spi/spi.h>
@@ -168,9 +168,9 @@ struct ssp_sensorhub_info {
  * @fw_dl_state:	firmware download state
  * @comm_lock:		lock protecting the handshake
  * @pending_lock:	lock protecting pending list and completion
- * @mcu_reset_gpio:	mcu reset line
- * @ap_mcu_gpio:	ap to mcu gpio line
- * @mcu_ap_gpio:	mcu to ap gpio line
+ * @mcu_reset_gpiod:	mcu reset line
+ * @ap_mcu_gpiod:	ap to mcu gpio line
+ * @mcu_ap_gpiod:	mcu to ap gpio line
  * @pending_list:	pending list for messages queued to be sent/read
  * @sensor_devs:	registered IIO devices table
  * @enable_refcount:	enable reference count for wdt (watchdog timer)
@@ -212,9 +212,9 @@ struct ssp_data {
 	struct mutex comm_lock;
 	struct mutex pending_lock;
 
-	int mcu_reset_gpio;
-	int ap_mcu_gpio;
-	int mcu_ap_gpio;
+	struct gpio_desc *mcu_reset_gpiod;
+	struct gpio_desc *ap_mcu_gpiod;
+	struct gpio_desc *mcu_ap_gpiod;
 
 	struct list_head pending_list;
 
diff --git a/drivers/iio/common/ssp_sensors/ssp_dev.c b/drivers/iio/common/ssp_sensors/ssp_dev.c
index 9c70553994c6..a94dbcf491ce 100644
--- a/drivers/iio/common/ssp_sensors/ssp_dev.c
+++ b/drivers/iio/common/ssp_sensors/ssp_dev.c
@@ -9,7 +9,6 @@
 #include <linux/mfd/core.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/of_platform.h>
 #include "ssp.h"
 
@@ -61,9 +60,9 @@ static const struct mfd_cell sensorhub_sensor_devs[] = {
 
 static void ssp_toggle_mcu_reset_gpio(struct ssp_data *data)
 {
-	gpio_set_value(data->mcu_reset_gpio, 0);
+	gpiod_set_value(data->mcu_reset_gpiod, 0);
 	usleep_range(1000, 1200);
-	gpio_set_value(data->mcu_reset_gpio, 1);
+	gpiod_set_value(data->mcu_reset_gpiod, 1);
 	msleep(50);
 }
 
@@ -441,7 +440,6 @@ MODULE_DEVICE_TABLE(of, ssp_of_match);
 
 static struct ssp_data *ssp_parse_dt(struct device *dev)
 {
-	int ret;
 	struct ssp_data *data;
 	struct device_node *node = dev->of_node;
 	const struct of_device_id *match;
@@ -450,26 +448,17 @@ static struct ssp_data *ssp_parse_dt(struct device *dev)
 	if (!data)
 		return NULL;
 
-	data->mcu_ap_gpio = of_get_named_gpio(node, "mcu-ap-gpios", 0);
-	if (data->mcu_ap_gpio < 0)
-		return NULL;
-
-	data->ap_mcu_gpio = of_get_named_gpio(node, "ap-mcu-gpios", 0);
-	if (data->ap_mcu_gpio < 0)
-		return NULL;
-
-	data->mcu_reset_gpio = of_get_named_gpio(node, "mcu-reset-gpios", 0);
-	if (data->mcu_reset_gpio < 0)
+	data->mcu_ap_gpiod = devm_gpiod_get(dev, "mcu-ap", GPIOD_IN);
+	if (IS_ERR(data->mcu_ap_gpiod))
 		return NULL;
 
-	ret = devm_gpio_request_one(dev, data->ap_mcu_gpio, GPIOF_OUT_INIT_HIGH,
-				    "ap-mcu-gpios");
-	if (ret)
+	data->ap_mcu_gpiod = devm_gpiod_get(dev, "ap-mcu", GPIOD_OUT_HIGH);
+	if (IS_ERR(data->ap_mcu_gpiod))
 		return NULL;
 
-	ret = devm_gpio_request_one(dev, data->mcu_reset_gpio,
-				    GPIOF_OUT_INIT_HIGH, "mcu-reset-gpios");
-	if (ret)
+	data->mcu_reset_gpiod = devm_gpiod_get(dev, "mcu-reset",
+					       GPIOD_OUT_HIGH);
+	if (IS_ERR(data->mcu_reset_gpiod))
 		return NULL;
 
 	match = of_match_node(ssp_of_match, node);
diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/ssp_sensors/ssp_spi.c
index 7db3d5886e3e..4864c38b8d1c 100644
--- a/drivers/iio/common/ssp_sensors/ssp_spi.c
+++ b/drivers/iio/common/ssp_sensors/ssp_spi.c
@@ -155,9 +155,9 @@ static int ssp_check_lines(struct ssp_data *data, bool state)
 {
 	int delay_cnt = 0;
 
-	gpio_set_value_cansleep(data->ap_mcu_gpio, state);
+	gpiod_set_value_cansleep(data->ap_mcu_gpiod, state);
 
-	while (gpio_get_value_cansleep(data->mcu_ap_gpio) != state) {
+	while (gpiod_get_value_cansleep(data->mcu_ap_gpiod) != state) {
 		usleep_range(3000, 3500);
 
 		if (data->shut_down || delay_cnt++ > 500) {
@@ -165,7 +165,7 @@ static int ssp_check_lines(struct ssp_data *data, bool state)
 				__func__, state);
 
 			if (!state)
-				gpio_set_value_cansleep(data->ap_mcu_gpio, 1);
+				gpiod_set_value_cansleep(data->ap_mcu_gpiod, 1);
 
 			return -ETIMEDOUT;
 		}
@@ -197,7 +197,7 @@ static int ssp_do_transfer(struct ssp_data *data, struct ssp_msg *msg,
 
 	status = spi_write(data->spi, msg->buffer, SSP_HEADER_SIZE);
 	if (status < 0) {
-		gpio_set_value_cansleep(data->ap_mcu_gpio, 1);
+		gpiod_set_value_cansleep(data->ap_mcu_gpiod, 1);
 		dev_err(SSP_DEV, "%s spi_write fail\n", __func__);
 		goto _error_locked;
 	}
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
index 4a2efa00f7f2..e817537cdfb5 100644
--- a/drivers/iio/common/st_sensors/st_sensors_trigger.c
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -19,6 +19,9 @@
 
 /**
  * st_sensors_new_samples_available() - check if more samples came in
+ * @indio_dev: IIO device reference.
+ * @sdata: Sensor data.
+ *
  * returns:
  * 0 - no new samples available
  * 1 - new samples available
diff --git a/drivers/iio/dac/ad5592r-base.c b/drivers/iio/dac/ad5592r-base.c
index 2d897e64c6a9..e2110113e884 100644
--- a/drivers/iio/dac/ad5592r-base.c
+++ b/drivers/iio/dac/ad5592r-base.c
@@ -15,7 +15,6 @@
 #include <linux/regulator/consumer.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
-#include <linux/gpio.h>
 #include <linux/property.h>
 
 #include <dt-bindings/iio/adi,ad5592r.h>
diff --git a/drivers/iio/dac/ad7303.c b/drivers/iio/dac/ad7303.c
index 14bbac6bee98..15af8a1cce3e 100644
--- a/drivers/iio/dac/ad7303.c
+++ b/drivers/iio/dac/ad7303.c
@@ -12,7 +12,6 @@
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/regulator/consumer.h>
-#include <linux/of.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -202,7 +201,6 @@ static int ad7303_probe(struct spi_device *spi)
 	const struct spi_device_id *id = spi_get_device_id(spi);
 	struct iio_dev *indio_dev;
 	struct ad7303_state *st;
-	bool ext_ref;
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
@@ -224,24 +222,15 @@ static int ad7303_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	if (spi->dev.of_node) {
-		ext_ref = of_property_read_bool(spi->dev.of_node,
-				"REF-supply");
-	} else {
-		struct ad7303_platform_data *pdata = spi->dev.platform_data;
-		if (pdata && pdata->use_external_ref)
-			ext_ref = true;
-		else
-		    ext_ref = false;
-	}
-
-	if (ext_ref) {
-		st->vref_reg = devm_regulator_get(&spi->dev, "REF");
-		if (IS_ERR(st->vref_reg)) {
-			ret = PTR_ERR(st->vref_reg);
+	st->vref_reg = devm_regulator_get_optional(&spi->dev, "REF");
+	if (IS_ERR(st->vref_reg)) {
+		ret = PTR_ERR(st->vref_reg);
+		if (ret != -ENODEV)
 			goto err_disable_vdd_reg;
-		}
+		st->vref_reg = NULL;
+	}
 
+	if (st->vref_reg) {
 		ret = regulator_enable(st->vref_reg);
 		if (ret)
 			goto err_disable_vdd_reg;
diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index ae0ca09ae062..1c2dc9b00f31 100644
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -14,11 +14,10 @@
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/gcd.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <asm/div64.h>
 #include <linux/clk.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -34,6 +33,7 @@ enum {
 struct adf4350_state {
 	struct spi_device		*spi;
 	struct regulator		*reg;
+	struct gpio_desc		*lock_detect_gpiod;
 	struct adf4350_platform_data	*pdata;
 	struct clk			*clk;
 	unsigned long			clkin;
@@ -61,7 +61,6 @@ static struct adf4350_platform_data default_pdata = {
 	.r3_user_settings = ADF4350_REG3_12BIT_CLKDIV_MODE(0),
 	.r4_user_settings = ADF4350_REG4_OUTPUT_PWR(3) |
 			    ADF4350_REG4_MUTE_TILL_LOCK_EN,
-	.gpio_lock_detect = -1,
 };
 
 static int adf4350_sync_config(struct adf4350_state *st)
@@ -317,8 +316,8 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
 			(u64)st->fpfd;
 		do_div(val, st->r1_mod * (1 << st->r4_rf_div_sel));
 		/* PLL unlocked? return error */
-		if (gpio_is_valid(st->pdata->gpio_lock_detect))
-			if (!gpio_get_value(st->pdata->gpio_lock_detect)) {
+		if (st->lock_detect_gpiod)
+			if (!gpiod_get_value(st->lock_detect_gpiod)) {
 				dev_dbg(&st->spi->dev, "PLL un-locked\n");
 				ret = -EBUSY;
 			}
@@ -381,7 +380,6 @@ static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
 	struct device_node *np = dev->of_node;
 	struct adf4350_platform_data *pdata;
 	unsigned int tmp;
-	int ret;
 
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -401,12 +399,6 @@ static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
 	of_property_read_u32(np, "adi,reference-div-factor", &tmp);
 	pdata->ref_div_factor = tmp;
 
-	ret = of_get_gpio(np, 0);
-	if (ret < 0)
-		pdata->gpio_lock_detect = -1;
-	else
-		pdata->gpio_lock_detect = ret;
-
 	pdata->ref_doubler_en = of_property_read_bool(np,
 			"adi,reference-doubler-enable");
 	pdata->ref_div2_en = of_property_read_bool(np,
@@ -561,16 +553,10 @@ static int adf4350_probe(struct spi_device *spi)
 
 	memset(st->regs_hw, 0xFF, sizeof(st->regs_hw));
 
-	if (gpio_is_valid(pdata->gpio_lock_detect)) {
-		ret = devm_gpio_request(&spi->dev, pdata->gpio_lock_detect,
-					indio_dev->name);
-		if (ret) {
-			dev_err(&spi->dev, "fail to request lock detect GPIO-%d",
-				pdata->gpio_lock_detect);
-			goto error_disable_reg;
-		}
-		gpio_direction_input(pdata->gpio_lock_detect);
-	}
+	st->lock_detect_gpiod = devm_gpiod_get_optional(&spi->dev, NULL,
+							GPIOD_IN);
+	if (IS_ERR(st->lock_detect_gpiod))
+		return PTR_ERR(st->lock_detect_gpiod);
 
 	if (pdata->power_up_frequency) {
 		ret = adf4350_set_freq(st, pdata->power_up_frequency);
diff --git a/drivers/iio/gyro/Kconfig b/drivers/iio/gyro/Kconfig
index 95e6f96d4529..7eaf77707b0b 100644
--- a/drivers/iio/gyro/Kconfig
+++ b/drivers/iio/gyro/Kconfig
@@ -75,26 +75,26 @@ config BMG160_SPI
 	select REGMAP_SPI
 
 config FXAS21002C
-       tristate "NXP FXAS21002C Gyro Sensor"
-       select IIO_BUFFER
-       select IIO_TRIGGERED_BUFFER
-       select FXAS21002C_I2C if (I2C)
-       select FXAS21002C_SPI if (SPI)
-       depends on (I2C || SPI_MASTER)
-       help
-         Say yes here to build support for NXP FXAS21002C Tri-axis Gyro
-         Sensor driver connected via I2C or SPI.
-
-         This driver can also be built as a module.  If so, the module
-         will be called fxas21002c_i2c or fxas21002c_spi.
+	tristate "NXP FXAS21002C Gyro Sensor"
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	select FXAS21002C_I2C if (I2C)
+	select FXAS21002C_SPI if (SPI)
+	depends on (I2C || SPI_MASTER)
+	help
+	  Say yes here to build support for NXP FXAS21002C Tri-axis Gyro
+	  Sensor driver connected via I2C or SPI.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called fxas21002c_i2c or fxas21002c_spi.
 
 config FXAS21002C_I2C
-       tristate
-       select REGMAP_I2C
+	tristate
+	select REGMAP_I2C
 
 config FXAS21002C_SPI
-       tristate
-       select REGMAP_SPI
+	tristate
+	select REGMAP_SPI
 
 config HID_SENSOR_GYRO_3D
 	depends on HID_SENSOR_HUB
diff --git a/drivers/iio/gyro/adis16136.c b/drivers/iio/gyro/adis16136.c
index d637d52d051a..f10c4f173898 100644
--- a/drivers/iio/gyro/adis16136.c
+++ b/drivers/iio/gyro/adis16136.c
@@ -185,12 +185,12 @@ static int adis16136_set_freq(struct adis16136 *adis16136, unsigned int freq)
 	return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, t);
 }
 
-static int adis16136_get_freq(struct adis16136 *adis16136, unsigned int *freq)
+static int __adis16136_get_freq(struct adis16136 *adis16136, unsigned int *freq)
 {
 	uint16_t t;
 	int ret;
 
-	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
+	ret = __adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
 	if (ret)
 		return ret;
 
@@ -224,10 +224,13 @@ static ssize_t adis16136_read_frequency(struct device *dev,
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct adis16136 *adis16136 = iio_priv(indio_dev);
+	struct mutex *slock = &adis16136->adis.state_lock;
 	unsigned int freq;
 	int ret;
 
-	ret = adis16136_get_freq(adis16136, &freq);
+	mutex_lock(slock);
+	ret = __adis16136_get_freq(adis16136, &freq);
+	mutex_unlock(slock);
 	if (ret)
 		return ret;
 
@@ -252,42 +255,50 @@ static const unsigned adis16136_3db_divisors[] = {
 static int adis16136_set_filter(struct iio_dev *indio_dev, int val)
 {
 	struct adis16136 *adis16136 = iio_priv(indio_dev);
+	struct mutex *slock = &adis16136->adis.state_lock;
 	unsigned int freq;
 	int i, ret;
 
-	ret = adis16136_get_freq(adis16136, &freq);
+	mutex_lock(slock);
+	ret = __adis16136_get_freq(adis16136, &freq);
 	if (ret)
-		return ret;
+		goto out_unlock;
 
 	for (i = ARRAY_SIZE(adis16136_3db_divisors) - 1; i >= 1; i--) {
 		if (freq / adis16136_3db_divisors[i] >= val)
 			break;
 	}
 
-	return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, i);
+	ret = __adis_write_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, i);
+out_unlock:
+	mutex_unlock(slock);
+
+	return ret;
 }
 
 static int adis16136_get_filter(struct iio_dev *indio_dev, int *val)
 {
 	struct adis16136 *adis16136 = iio_priv(indio_dev);
+	struct mutex *slock = &adis16136->adis.state_lock;
 	unsigned int freq;
 	uint16_t val16;
 	int ret;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(slock);
 
-	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, &val16);
+	ret = __adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT,
+				 &val16);
 	if (ret)
 		goto err_unlock;
 
-	ret = adis16136_get_freq(adis16136, &freq);
+	ret = __adis16136_get_freq(adis16136, &freq);
 	if (ret)
 		goto err_unlock;
 
 	*val = freq / adis16136_3db_divisors[val16 & 0x07];
 
 err_unlock:
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(slock);
 
 	return ret ? ret : IIO_VAL_INT;
 }
diff --git a/drivers/iio/gyro/adis16260.c b/drivers/iio/gyro/adis16260.c
index 207a0ce13439..726a0aa321a8 100644
--- a/drivers/iio/gyro/adis16260.c
+++ b/drivers/iio/gyro/adis16260.c
@@ -293,7 +293,7 @@ static int adis16260_write_raw(struct iio_dev *indio_dev,
 		addr = adis16260_addresses[chan->scan_index][1];
 		return adis_write_reg_16(adis, addr, val);
 	case IIO_CHAN_INFO_SAMP_FREQ:
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(&adis->state_lock);
 		if (spi_get_device_id(adis->spi)->driver_data)
 			t = 256 / val;
 		else
@@ -308,9 +308,9 @@ static int adis16260_write_raw(struct iio_dev *indio_dev,
 			adis->spi->max_speed_hz = ADIS16260_SPI_SLOW;
 		else
 			adis->spi->max_speed_hz = ADIS16260_SPI_FAST;
-		ret = adis_write_reg_8(adis, ADIS16260_SMPL_PRD, t);
+		ret = __adis_write_reg_8(adis, ADIS16260_SMPL_PRD, t);
 
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(&adis->state_lock);
 		return ret;
 	}
 	return -EINVAL;
diff --git a/drivers/iio/gyro/itg3200_core.c b/drivers/iio/gyro/itg3200_core.c
index 981ae2291505..b3afa556f973 100644
--- a/drivers/iio/gyro/itg3200_core.c
+++ b/drivers/iio/gyro/itg3200_core.c
@@ -15,7 +15,6 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/i2c.h>
-#include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/stat.h>
 #include <linux/module.h>
diff --git a/drivers/iio/gyro/st_gyro.h b/drivers/iio/gyro/st_gyro.h
index 592f6b34e987..fd9171cc3aba 100644
--- a/drivers/iio/gyro/st_gyro.h
+++ b/drivers/iio/gyro/st_gyro.h
@@ -28,7 +28,7 @@
  * struct st_sensors_platform_data - gyro platform data
  * @drdy_int_pin: DRDY on gyros is available only on INT2 pin.
  */
-static const struct st_sensors_platform_data gyro_pdata = {
+static __maybe_unused const struct st_sensors_platform_data gyro_pdata = {
 	.drdy_int_pin = 2,
 };
 
diff --git a/drivers/iio/humidity/hts221_core.c b/drivers/iio/humidity/hts221_core.c
index 4922444771c6..9003671f14fb 100644
--- a/drivers/iio/humidity/hts221_core.c
+++ b/drivers/iio/humidity/hts221_core.c
@@ -24,13 +24,6 @@
 #define HTS221_REG_CNTRL1_ADDR		0x20
 #define HTS221_REG_CNTRL2_ADDR		0x21
 
-#define HTS221_REG_AVG_ADDR		0x10
-#define HTS221_REG_H_OUT_L		0x28
-#define HTS221_REG_T_OUT_L		0x2a
-
-#define HTS221_HUMIDITY_AVG_MASK	0x07
-#define HTS221_TEMP_AVG_MASK		0x38
-
 #define HTS221_ODR_MASK			0x03
 #define HTS221_BDU_MASK			BIT(2)
 #define HTS221_ENABLE_MASK		BIT(7)
@@ -66,8 +59,8 @@ static const struct hts221_odr hts221_odr_table[] = {
 
 static const struct hts221_avg hts221_avg_list[] = {
 	{
-		.addr = HTS221_REG_AVG_ADDR,
-		.mask = HTS221_HUMIDITY_AVG_MASK,
+		.addr = 0x10,
+		.mask = 0x07,
 		.avg_avl = {
 			4, /* 0.4 %RH */
 			8, /* 0.3 %RH */
@@ -80,8 +73,8 @@ static const struct hts221_avg hts221_avg_list[] = {
 		},
 	},
 	{
-		.addr = HTS221_REG_AVG_ADDR,
-		.mask = HTS221_TEMP_AVG_MASK,
+		.addr = 0x10,
+		.mask = 0x38,
 		.avg_avl = {
 			2, /* 0.08 degC */
 			4, /* 0.05 degC */
@@ -98,7 +91,7 @@ static const struct hts221_avg hts221_avg_list[] = {
 static const struct iio_chan_spec hts221_channels[] = {
 	{
 		.type = IIO_HUMIDITYRELATIVE,
-		.address = HTS221_REG_H_OUT_L,
+		.address = 0x28,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 				      BIT(IIO_CHAN_INFO_OFFSET) |
 				      BIT(IIO_CHAN_INFO_SCALE) |
@@ -114,7 +107,7 @@ static const struct iio_chan_spec hts221_channels[] = {
 	},
 	{
 		.type = IIO_TEMP,
-		.address = HTS221_REG_T_OUT_L,
+		.address = 0x2a,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 				      BIT(IIO_CHAN_INFO_OFFSET) |
 				      BIT(IIO_CHAN_INFO_SCALE) |
diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h
index 159ea3f8c02b..fd9a5f1d5e51 100644
--- a/drivers/iio/iio_core.h
+++ b/drivers/iio/iio_core.h
@@ -42,14 +42,14 @@ struct poll_table_struct;
 
 __poll_t iio_buffer_poll(struct file *filp,
 			     struct poll_table_struct *wait);
-ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
-				      size_t n, loff_t *f_ps);
+ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
+			      size_t n, loff_t *f_ps);
 
 int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
 void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
 
 #define iio_buffer_poll_addr (&iio_buffer_poll)
-#define iio_buffer_read_first_n_outer_addr (&iio_buffer_read_first_n_outer)
+#define iio_buffer_read_outer_addr (&iio_buffer_read_outer)
 
 void iio_disable_all_buffers(struct iio_dev *indio_dev);
 void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
@@ -57,7 +57,7 @@ void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
 #else
 
 #define iio_buffer_poll_addr NULL
-#define iio_buffer_read_first_n_outer_addr NULL
+#define iio_buffer_read_outer_addr NULL
 
 static inline int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 {
diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
index e14c8536fd09..9ba4a7c8e7ad 100644
--- a/drivers/iio/imu/adis.c
+++ b/drivers/iio/imu/adis.c
@@ -26,7 +26,14 @@
 #define ADIS_MSC_CTRL_DATA_RDY_DIO2	BIT(0)
 #define ADIS_GLOB_CMD_SW_RESET		BIT(7)
 
-int adis_write_reg(struct adis *adis, unsigned int reg,
+/**
+ * __adis_write_reg() - write N bytes to register (unlocked version)
+ * @adis: The adis device
+ * @reg: The address of the lower of the two registers
+ * @value: The value to write to device (up to 4 bytes)
+ * @size: The size of the @value (in bytes)
+ */
+int __adis_write_reg(struct adis *adis, unsigned int reg,
 	unsigned int value, unsigned int size)
 {
 	unsigned int page = reg / ADIS_PAGE_SIZE;
@@ -70,8 +77,6 @@ int adis_write_reg(struct adis *adis, unsigned int reg,
 		},
 	};
 
-	mutex_lock(&adis->txrx_lock);
-
 	spi_message_init(&msg);
 
 	if (adis->current_page != page) {
@@ -96,8 +101,7 @@ int adis_write_reg(struct adis *adis, unsigned int reg,
 		adis->tx[3] = value & 0xff;
 		break;
 	default:
-		ret = -EINVAL;
-		goto out_unlock;
+		return -EINVAL;
 	}
 
 	xfers[size].cs_change = 0;
@@ -113,20 +117,18 @@ int adis_write_reg(struct adis *adis, unsigned int reg,
 		adis->current_page = page;
 	}
 
-out_unlock:
-	mutex_unlock(&adis->txrx_lock);
-
 	return ret;
 }
-EXPORT_SYMBOL_GPL(adis_write_reg);
+EXPORT_SYMBOL_GPL(__adis_write_reg);
 
 /**
- * adis_read_reg() - read 2 bytes from a 16-bit register
+ * __adis_read_reg() - read N bytes from register (unlocked version)
  * @adis: The adis device
  * @reg: The address of the lower of the two registers
  * @val: The value read back from the device
+ * @size: The size of the @val buffer
  */
-int adis_read_reg(struct adis *adis, unsigned int reg,
+int __adis_read_reg(struct adis *adis, unsigned int reg,
 	unsigned int *val, unsigned int size)
 {
 	unsigned int page = reg / ADIS_PAGE_SIZE;
@@ -166,7 +168,6 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
 		},
 	};
 
-	mutex_lock(&adis->txrx_lock);
 	spi_message_init(&msg);
 
 	if (adis->current_page != page) {
@@ -188,15 +189,14 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
 		spi_message_add_tail(&xfers[3], &msg);
 		break;
 	default:
-		ret = -EINVAL;
-		goto out_unlock;
+		return -EINVAL;
 	}
 
 	ret = spi_sync(adis->spi, &msg);
 	if (ret) {
 		dev_err(&adis->spi->dev, "Failed to read register 0x%02X: %d\n",
 				reg, ret);
-		goto out_unlock;
+		return ret;
 	} else {
 		adis->current_page = page;
 	}
@@ -210,12 +210,9 @@ int adis_read_reg(struct adis *adis, unsigned int reg,
 		break;
 	}
 
-out_unlock:
-	mutex_unlock(&adis->txrx_lock);
-
 	return ret;
 }
-EXPORT_SYMBOL_GPL(adis_read_reg);
+EXPORT_SYMBOL_GPL(__adis_read_reg);
 
 #ifdef CONFIG_DEBUG_FS
 
@@ -253,12 +250,16 @@ int adis_enable_irq(struct adis *adis, bool enable)
 	int ret = 0;
 	uint16_t msc;
 
-	if (adis->data->enable_irq)
-		return adis->data->enable_irq(adis, enable);
+	mutex_lock(&adis->state_lock);
+
+	if (adis->data->enable_irq) {
+		ret = adis->data->enable_irq(adis, enable);
+		goto out_unlock;
+	}
 
-	ret = adis_read_reg_16(adis, adis->data->msc_ctrl_reg, &msc);
+	ret = __adis_read_reg_16(adis, adis->data->msc_ctrl_reg, &msc);
 	if (ret)
-		goto error_ret;
+		goto out_unlock;
 
 	msc |= ADIS_MSC_CTRL_DATA_RDY_POL_HIGH;
 	msc &= ~ADIS_MSC_CTRL_DATA_RDY_DIO2;
@@ -267,26 +268,27 @@ int adis_enable_irq(struct adis *adis, bool enable)
 	else
 		msc &= ~ADIS_MSC_CTRL_DATA_RDY_EN;
 
-	ret = adis_write_reg_16(adis, adis->data->msc_ctrl_reg, msc);
+	ret = __adis_write_reg_16(adis, adis->data->msc_ctrl_reg, msc);
 
-error_ret:
+out_unlock:
+	mutex_unlock(&adis->state_lock);
 	return ret;
 }
 EXPORT_SYMBOL(adis_enable_irq);
 
 /**
- * adis_check_status() - Check the device for error conditions
+ * __adis_check_status() - Check the device for error conditions (unlocked)
  * @adis: The adis device
  *
  * Returns 0 on success, a negative error code otherwise
  */
-int adis_check_status(struct adis *adis)
+int __adis_check_status(struct adis *adis)
 {
 	uint16_t status;
 	int ret;
 	int i;
 
-	ret = adis_read_reg_16(adis, adis->data->diag_stat_reg, &status);
+	ret = __adis_read_reg_16(adis, adis->data->diag_stat_reg, &status);
 	if (ret)
 		return ret;
 
@@ -304,32 +306,32 @@ int adis_check_status(struct adis *adis)
 
 	return -EIO;
 }
-EXPORT_SYMBOL_GPL(adis_check_status);
+EXPORT_SYMBOL_GPL(__adis_check_status);
 
 /**
- * adis_reset() - Reset the device
+ * __adis_reset() - Reset the device (unlocked version)
  * @adis: The adis device
  *
  * Returns 0 on success, a negative error code otherwise
  */
-int adis_reset(struct adis *adis)
+int __adis_reset(struct adis *adis)
 {
 	int ret;
 
-	ret = adis_write_reg_8(adis, adis->data->glob_cmd_reg,
+	ret = __adis_write_reg_8(adis, adis->data->glob_cmd_reg,
 			ADIS_GLOB_CMD_SW_RESET);
 	if (ret)
 		dev_err(&adis->spi->dev, "Failed to reset device: %d\n", ret);
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(adis_reset);
+EXPORT_SYMBOL_GPL(__adis_reset);
 
 static int adis_self_test(struct adis *adis)
 {
 	int ret;
 
-	ret = adis_write_reg_16(adis, adis->data->msc_ctrl_reg,
+	ret = __adis_write_reg_16(adis, adis->data->msc_ctrl_reg,
 			adis->data->self_test_mask);
 	if (ret) {
 		dev_err(&adis->spi->dev, "Failed to initiate self test: %d\n",
@@ -339,10 +341,10 @@ static int adis_self_test(struct adis *adis)
 
 	msleep(adis->data->startup_delay);
 
-	ret = adis_check_status(adis);
+	ret = __adis_check_status(adis);
 
 	if (adis->data->self_test_no_autoclear)
-		adis_write_reg_16(adis, adis->data->msc_ctrl_reg, 0x00);
+		__adis_write_reg_16(adis, adis->data->msc_ctrl_reg, 0x00);
 
 	return ret;
 }
@@ -360,19 +362,23 @@ int adis_initial_startup(struct adis *adis)
 {
 	int ret;
 
+	mutex_lock(&adis->state_lock);
+
 	ret = adis_self_test(adis);
 	if (ret) {
 		dev_err(&adis->spi->dev, "Self-test failed, trying reset.\n");
-		adis_reset(adis);
+		__adis_reset(adis);
 		msleep(adis->data->startup_delay);
 		ret = adis_self_test(adis);
 		if (ret) {
 			dev_err(&adis->spi->dev, "Second self-test failed, giving up.\n");
-			return ret;
+			goto out_unlock;
 		}
 	}
 
-	return 0;
+out_unlock:
+	mutex_unlock(&adis->state_lock);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(adis_initial_startup);
 
@@ -398,15 +404,15 @@ int adis_single_conversion(struct iio_dev *indio_dev,
 	unsigned int uval;
 	int ret;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(&adis->state_lock);
 
-	ret = adis_read_reg(adis, chan->address, &uval,
+	ret = __adis_read_reg(adis, chan->address, &uval,
 			chan->scan_type.storagebits / 8);
 	if (ret)
 		goto err_unlock;
 
 	if (uval & error_mask) {
-		ret = adis_check_status(adis);
+		ret = __adis_check_status(adis);
 		if (ret)
 			goto err_unlock;
 	}
@@ -418,7 +424,7 @@ int adis_single_conversion(struct iio_dev *indio_dev,
 
 	ret = IIO_VAL_INT;
 err_unlock:
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(&adis->state_lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(adis_single_conversion);
@@ -438,7 +444,7 @@ EXPORT_SYMBOL_GPL(adis_single_conversion);
 int adis_init(struct adis *adis, struct iio_dev *indio_dev,
 	struct spi_device *spi, const struct adis_data *data)
 {
-	mutex_init(&adis->txrx_lock);
+	mutex_init(&adis->state_lock);
 	adis->spi = spi;
 	adis->data = data;
 	iio_device_set_drvdata(indio_dev, adis);
diff --git a/drivers/iio/imu/adis16400.c b/drivers/iio/imu/adis16400.c
index 44e46dc96e00..662cb5367c11 100644
--- a/drivers/iio/imu/adis16400.c
+++ b/drivers/iio/imu/adis16400.c
@@ -162,6 +162,7 @@ struct adis16400_chip_info {
 	unsigned int accel_scale_micro;
 	int temp_scale_nano;
 	int temp_offset;
+	/* set_freq() & get_freq() need to avoid using ADIS lib's state lock */
 	int (*set_freq)(struct adis16400_state *st, unsigned int freq);
 	int (*get_freq)(struct adis16400_state *st);
 };
@@ -326,7 +327,7 @@ static int adis16334_get_freq(struct adis16400_state *st)
 	int ret;
 	uint16_t t;
 
-	ret = adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
+	ret = __adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
 	if (ret)
 		return ret;
 
@@ -350,7 +351,7 @@ static int adis16334_set_freq(struct adis16400_state *st, unsigned int freq)
 	t <<= ADIS16334_RATE_DIV_SHIFT;
 	t |= ADIS16334_RATE_INT_CLK;
 
-	return adis_write_reg_16(&st->adis, ADIS16400_SMPL_PRD, t);
+	return __adis_write_reg_16(&st->adis, ADIS16400_SMPL_PRD, t);
 }
 
 static int adis16400_get_freq(struct adis16400_state *st)
@@ -358,7 +359,7 @@ static int adis16400_get_freq(struct adis16400_state *st)
 	int sps, ret;
 	uint16_t t;
 
-	ret = adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
+	ret = __adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
 	if (ret)
 		return ret;
 
@@ -390,7 +391,7 @@ static int adis16400_set_freq(struct adis16400_state *st, unsigned int freq)
 	else
 		st->adis.spi->max_speed_hz = ADIS16400_SPI_FAST;
 
-	return adis_write_reg_8(&st->adis, ADIS16400_SMPL_PRD, val);
+	return __adis_write_reg_8(&st->adis, ADIS16400_SMPL_PRD, val);
 }
 
 static const unsigned int adis16400_3db_divisors[] = {
@@ -404,7 +405,7 @@ static const unsigned int adis16400_3db_divisors[] = {
 	[7] = 200, /* Not a valid setting */
 };
 
-static int adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val)
+static int __adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val)
 {
 	struct adis16400_state *st = iio_priv(indio_dev);
 	uint16_t val16;
@@ -415,11 +416,11 @@ static int adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val)
 			break;
 	}
 
-	ret = adis_read_reg_16(&st->adis, ADIS16400_SENS_AVG, &val16);
+	ret = __adis_read_reg_16(&st->adis, ADIS16400_SENS_AVG, &val16);
 	if (ret)
 		return ret;
 
-	ret = adis_write_reg_16(&st->adis, ADIS16400_SENS_AVG,
+	ret = __adis_write_reg_16(&st->adis, ADIS16400_SENS_AVG,
 					 (val16 & ~0x07) | i);
 	return ret;
 }
@@ -507,32 +508,31 @@ static int adis16400_write_raw(struct iio_dev *indio_dev,
 	struct iio_chan_spec const *chan, int val, int val2, long info)
 {
 	struct adis16400_state *st = iio_priv(indio_dev);
+	struct mutex *slock = &st->adis.state_lock;
 	int ret, sps;
 
 	switch (info) {
 	case IIO_CHAN_INFO_CALIBBIAS:
-		mutex_lock(&indio_dev->mlock);
 		ret = adis_write_reg_16(&st->adis,
 				adis16400_addresses[chan->scan_index], val);
-		mutex_unlock(&indio_dev->mlock);
 		return ret;
 	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
 		/*
 		 * Need to cache values so we can update if the frequency
 		 * changes.
 		 */
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(slock);
 		st->filt_int = val;
 		/* Work out update to current value */
 		sps = st->variant->get_freq(st);
 		if (sps < 0) {
-			mutex_unlock(&indio_dev->mlock);
+			mutex_unlock(slock);
 			return sps;
 		}
 
-		ret = adis16400_set_filter(indio_dev, sps,
+		ret = __adis16400_set_filter(indio_dev, sps,
 			val * 1000 + val2 / 1000);
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(slock);
 		return ret;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		sps = val * 1000 + val2 / 1000;
@@ -540,9 +540,9 @@ static int adis16400_write_raw(struct iio_dev *indio_dev,
 		if (sps <= 0)
 			return -EINVAL;
 
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(slock);
 		ret = st->variant->set_freq(st, sps);
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(slock);
 		return ret;
 	default:
 		return -EINVAL;
@@ -553,6 +553,7 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
 	struct iio_chan_spec const *chan, int *val, int *val2, long info)
 {
 	struct adis16400_state *st = iio_priv(indio_dev);
+	struct mutex *slock = &st->adis.state_lock;
 	int16_t val16;
 	int ret;
 
@@ -596,10 +597,8 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
 			return -EINVAL;
 		}
 	case IIO_CHAN_INFO_CALIBBIAS:
-		mutex_lock(&indio_dev->mlock);
 		ret = adis_read_reg_16(&st->adis,
 				adis16400_addresses[chan->scan_index], &val16);
-		mutex_unlock(&indio_dev->mlock);
 		if (ret)
 			return ret;
 		val16 = sign_extend32(val16, 11);
@@ -610,27 +609,27 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
 		*val = st->variant->temp_offset;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(slock);
 		/* Need both the number of taps and the sampling frequency */
-		ret = adis_read_reg_16(&st->adis,
+		ret = __adis_read_reg_16(&st->adis,
 						ADIS16400_SENS_AVG,
 						&val16);
 		if (ret) {
-			mutex_unlock(&indio_dev->mlock);
+			mutex_unlock(slock);
 			return ret;
 		}
 		ret = st->variant->get_freq(st);
-		if (ret >= 0) {
-			ret /= adis16400_3db_divisors[val16 & 0x07];
-			*val = ret / 1000;
-			*val2 = (ret % 1000) * 1000;
-		}
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(slock);
 		if (ret)
 			return ret;
+		ret /= adis16400_3db_divisors[val16 & 0x07];
+		*val = ret / 1000;
+		*val2 = (ret % 1000) * 1000;
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_SAMP_FREQ:
+		mutex_lock(slock);
 		ret = st->variant->get_freq(st);
+		mutex_unlock(slock);
 		if (ret)
 			return ret;
 		*val = ret / 1000;
diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
index 748f8bbf184d..f73094e8d35d 100644
--- a/drivers/iio/imu/adis16480.c
+++ b/drivers/iio/imu/adis16480.c
@@ -555,6 +555,7 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
 	const struct iio_chan_spec *chan, unsigned int freq)
 {
 	struct adis16480 *st = iio_priv(indio_dev);
+	struct mutex *slock = &st->adis.state_lock;
 	unsigned int enable_mask, offset, reg;
 	unsigned int diff, best_diff;
 	unsigned int i, best_freq;
@@ -565,9 +566,11 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
 	offset = ad16480_filter_data[chan->scan_index][1];
 	enable_mask = BIT(offset + 2);
 
-	ret = adis_read_reg_16(&st->adis, reg, &val);
+	mutex_lock(slock);
+
+	ret = __adis_read_reg_16(&st->adis, reg, &val);
 	if (ret)
-		return ret;
+		goto out_unlock;
 
 	if (freq == 0) {
 		val &= ~enable_mask;
@@ -589,7 +592,11 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
 		val |= enable_mask;
 	}
 
-	return adis_write_reg_16(&st->adis, reg, val);
+	ret = __adis_write_reg_16(&st->adis, reg, val);
+out_unlock:
+	mutex_unlock(slock);
+
+	return ret;
 }
 
 static int adis16480_read_raw(struct iio_dev *indio_dev,
@@ -947,14 +954,14 @@ static int adis16480_enable_irq(struct adis *adis, bool enable)
 	uint16_t val;
 	int ret;
 
-	ret = adis_read_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL, &val);
+	ret = __adis_read_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL, &val);
 	if (ret)
 		return ret;
 
 	val &= ~ADIS16480_DRDY_EN_MSK;
 	val |= ADIS16480_DRDY_EN(enable);
 
-	return adis_write_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL, val);
+	return __adis_write_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL, val);
 }
 
 static int adis16480_initial_setup(struct iio_dev *indio_dev)
diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c
index 4998a89d083d..3f4dd5c00b03 100644
--- a/drivers/iio/imu/adis_buffer.c
+++ b/drivers/iio/imu/adis_buffer.c
@@ -129,7 +129,7 @@ static irqreturn_t adis_trigger_handler(int irq, void *p)
 		return -ENOMEM;
 
 	if (adis->data->has_paging) {
-		mutex_lock(&adis->txrx_lock);
+		mutex_lock(&adis->state_lock);
 		if (adis->current_page != 0) {
 			adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
 			adis->tx[1] = 0;
@@ -144,7 +144,7 @@ static irqreturn_t adis_trigger_handler(int irq, void *p)
 
 	if (adis->data->has_paging) {
 		adis->current_page = 0;
-		mutex_unlock(&adis->txrx_lock);
+		mutex_unlock(&adis->state_lock);
 	}
 
 	iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
diff --git a/drivers/iio/imu/inv_mpu6050/Kconfig b/drivers/iio/imu/inv_mpu6050/Kconfig
index e4c4c12236a7..017bc0fcc365 100644
--- a/drivers/iio/imu/inv_mpu6050/Kconfig
+++ b/drivers/iio/imu/inv_mpu6050/Kconfig
@@ -10,11 +10,12 @@ config INV_MPU6050_IIO
 
 config INV_MPU6050_I2C
 	tristate "Invensense MPU6050 devices (I2C)"
-	depends on I2C_MUX
+	depends on I2C
+	select I2C_MUX
 	select INV_MPU6050_IIO
 	select REGMAP_I2C
 	help
-	  This driver supports the Invensense MPU6000/6050/6500/6515,
+	  This driver supports the Invensense MPU6050/6500/6515,
 	  MPU9150/9250/9255 and ICM20608/20602 motion tracking devices
 	  over I2C.
 	  This driver can be built as a module. The module will be called
@@ -26,8 +27,8 @@ config INV_MPU6050_SPI
 	select INV_MPU6050_IIO
 	select REGMAP_SPI
 	help
-	  This driver supports the Invensense MPU6000/6050/6500/6515,
-	  MPU9150/9250/9255 and ICM20608/20602 motion tracking devices
+	  This driver supports the Invensense MPU6000/6500/6515,
+	  MPU9250/9255 and ICM20608/20602 motion tracking devices
 	  over SPI.
 	  This driver can be built as a module. The module will be called
 	  inv-mpu6050-spi.
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 0686e41bb8a1..268240644adf 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -915,6 +915,33 @@ static const unsigned long inv_mpu_scan_masks[] = {
 		.ext_info = inv_ext_info,				\
 	}
 
+static const struct iio_chan_spec inv_mpu9150_channels[] = {
+	IIO_CHAN_SOFT_TIMESTAMP(INV_MPU9X50_SCAN_TIMESTAMP),
+	/*
+	 * Note that temperature should only be via polled reading only,
+	 * not the final scan elements output.
+	 */
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW)
+				| BIT(IIO_CHAN_INFO_OFFSET)
+				| BIT(IIO_CHAN_INFO_SCALE),
+		.scan_index = -1,
+	},
+	INV_MPU6050_CHAN(IIO_ANGL_VEL, IIO_MOD_X, INV_MPU6050_SCAN_GYRO_X),
+	INV_MPU6050_CHAN(IIO_ANGL_VEL, IIO_MOD_Y, INV_MPU6050_SCAN_GYRO_Y),
+	INV_MPU6050_CHAN(IIO_ANGL_VEL, IIO_MOD_Z, INV_MPU6050_SCAN_GYRO_Z),
+
+	INV_MPU6050_CHAN(IIO_ACCEL, IIO_MOD_X, INV_MPU6050_SCAN_ACCL_X),
+	INV_MPU6050_CHAN(IIO_ACCEL, IIO_MOD_Y, INV_MPU6050_SCAN_ACCL_Y),
+	INV_MPU6050_CHAN(IIO_ACCEL, IIO_MOD_Z, INV_MPU6050_SCAN_ACCL_Z),
+
+	/* Magnetometer resolution is 13 bits */
+	INV_MPU9X50_MAGN_CHAN(IIO_MOD_X, 13, INV_MPU9X50_SCAN_MAGN_X),
+	INV_MPU9X50_MAGN_CHAN(IIO_MOD_Y, 13, INV_MPU9X50_SCAN_MAGN_Y),
+	INV_MPU9X50_MAGN_CHAN(IIO_MOD_Z, 13, INV_MPU9X50_SCAN_MAGN_Z),
+};
+
 static const struct iio_chan_spec inv_mpu9250_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(INV_MPU9X50_SCAN_TIMESTAMP),
 	/*
@@ -1324,21 +1351,16 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
 		inv_mpu_bus_setup(indio_dev);
 
 	switch (chip_type) {
+	case INV_MPU9150:
+		indio_dev->channels = inv_mpu9150_channels;
+		indio_dev->num_channels = ARRAY_SIZE(inv_mpu9150_channels);
+		indio_dev->available_scan_masks = inv_mpu9x50_scan_masks;
+		break;
 	case INV_MPU9250:
 	case INV_MPU9255:
-		/*
-		 * Use magnetometer inside the chip only if there is no i2c
-		 * auxiliary device in use.
-		 */
-		if (!st->magn_disabled) {
-			indio_dev->channels = inv_mpu9250_channels;
-			indio_dev->num_channels = ARRAY_SIZE(inv_mpu9250_channels);
-			indio_dev->available_scan_masks = inv_mpu9x50_scan_masks;
-		} else {
-			indio_dev->channels = inv_mpu_channels;
-			indio_dev->num_channels = ARRAY_SIZE(inv_mpu_channels);
-			indio_dev->available_scan_masks = inv_mpu_scan_masks;
-		}
+		indio_dev->channels = inv_mpu9250_channels;
+		indio_dev->num_channels = ARRAY_SIZE(inv_mpu9250_channels);
+		indio_dev->available_scan_masks = inv_mpu9x50_scan_masks;
 		break;
 	case INV_ICM20602:
 		indio_dev->channels = inv_icm20602_channels;
@@ -1351,6 +1373,15 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
 		indio_dev->available_scan_masks = inv_mpu_scan_masks;
 		break;
 	}
+	/*
+	 * Use magnetometer inside the chip only if there is no i2c
+	 * auxiliary device in use. Otherwise Going back to 6-axis only.
+	 */
+	if (st->magn_disabled) {
+		indio_dev->channels = inv_mpu_channels;
+		indio_dev->num_channels = ARRAY_SIZE(inv_mpu_channels);
+		indio_dev->available_scan_masks = inv_mpu_scan_masks;
+	}
 
 	indio_dev->info = &mpu_info;
 	indio_dev->modes = INDIO_BUFFER_TRIGGERED;
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
index 389cc8505e0e..f47a28b4be23 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
@@ -77,6 +77,7 @@ static bool inv_mpu_i2c_aux_bus(struct device *dev)
 	case INV_ICM20602:
 		/* no i2c auxiliary bus on the chip */
 		return false;
+	case INV_MPU9150:
 	case INV_MPU9250:
 	case INV_MPU9255:
 		if (st->magn_disabled)
@@ -102,6 +103,7 @@ static int inv_mpu_magn_disable(struct iio_dev *indio_dev)
 	struct device_node *mux_node;
 
 	switch (st->chip_type) {
+	case INV_MPU9150:
 	case INV_MPU9250:
 	case INV_MPU9255:
 		mux_node = of_get_child_by_name(dev->of_node, "i2c-gate");
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
index 02735af152c8..4f192352521e 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
@@ -12,7 +12,9 @@
 #include "inv_mpu_magn.h"
 
 /*
- * MPU9250 magnetometer is an AKM AK8963 chip on I2C aux bus
+ * MPU9xxx magnetometer are AKM chips on I2C aux bus
+ * MPU9150 is AK8975
+ * MPU9250 is AK8963
  */
 #define INV_MPU_MAGN_I2C_ADDR		0x0C
 
@@ -33,10 +35,10 @@
 #define INV_MPU_MAGN_BITS_MODE_PWDN	0x00
 #define INV_MPU_MAGN_BITS_MODE_SINGLE	0x01
 #define INV_MPU_MAGN_BITS_MODE_FUSE	0x0F
-#define INV_MPU_MAGN_BIT_OUTPUT_BIT	0x10
+#define INV_MPU9250_MAGN_BIT_OUTPUT_BIT	0x10
 
-#define INV_MPU_MAGN_REG_CNTL2		0x0B
-#define INV_MPU_MAGN_BIT_SRST		0x01
+#define INV_MPU9250_MAGN_REG_CNTL2	0x0B
+#define INV_MPU9250_MAGN_BIT_SRST	0x01
 
 #define INV_MPU_MAGN_REG_ASAX		0x10
 #define INV_MPU_MAGN_REG_ASAY		0x11
@@ -48,6 +50,7 @@
 static bool inv_magn_supported(const struct inv_mpu6050_state *st)
 {
 	switch (st->chip_type) {
+	case INV_MPU9150:
 	case INV_MPU9250:
 	case INV_MPU9255:
 		return true;
@@ -61,6 +64,7 @@ static int inv_magn_init(struct inv_mpu6050_state *st)
 {
 	uint8_t val;
 	uint8_t asa[3];
+	int32_t sensitivity;
 	int ret;
 
 	/* check whoami */
@@ -71,12 +75,19 @@ static int inv_magn_init(struct inv_mpu6050_state *st)
 	if (val != INV_MPU_MAGN_BITS_WIA)
 		return -ENODEV;
 
-	/* reset chip */
-	ret = inv_mpu_aux_write(st, INV_MPU_MAGN_I2C_ADDR,
-				INV_MPU_MAGN_REG_CNTL2,
-				INV_MPU_MAGN_BIT_SRST);
-	if (ret)
-		return ret;
+	/* software reset for MPU925x only */
+	switch (st->chip_type) {
+	case INV_MPU9250:
+	case INV_MPU9255:
+		ret = inv_mpu_aux_write(st, INV_MPU_MAGN_I2C_ADDR,
+					INV_MPU9250_MAGN_REG_CNTL2,
+					INV_MPU9250_MAGN_BIT_SRST);
+		if (ret)
+			return ret;
+		break;
+	default:
+		break;
+	}
 
 	/* read fuse ROM data */
 	ret = inv_mpu_aux_write(st, INV_MPU_MAGN_I2C_ADDR,
@@ -98,22 +109,36 @@ static int inv_magn_init(struct inv_mpu6050_state *st)
 		return ret;
 
 	/*
+	 * Sensor sentivity
+	 * 1 uT = 0.01 G and value is in micron (1e6)
+	 * sensitvity = x uT * 0.01 * 1e6
+	 */
+	switch (st->chip_type) {
+	case INV_MPU9150:
+		/* sensor sensitivity is 0.3 uT */
+		sensitivity = 3000;
+		break;
+	case INV_MPU9250:
+	case INV_MPU9255:
+		/* sensor sensitivity in 16 bits mode: 0.15 uT */
+		sensitivity = 1500;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/*
 	 * Sensitivity adjustement and scale to Gauss
 	 *
 	 * Hadj = H * (((ASA - 128) * 0.5 / 128) + 1)
 	 * Factor simplification:
 	 * Hadj = H * ((ASA + 128) / 256)
 	 *
-	 * Sensor sentivity
-	 * 0.15 uT in 16 bits mode
-	 * 1 uT = 0.01 G and value is in micron (1e6)
-	 * sensitvity = 0.15 uT * 0.01 * 1e6
-	 *
-	 * raw_to_gauss = Hadj * 1500
+	 * raw_to_gauss = Hadj * sensitivity
 	 */
-	st->magn_raw_to_gauss[0] = (((int32_t)asa[0] + 128) * 1500) / 256;
-	st->magn_raw_to_gauss[1] = (((int32_t)asa[1] + 128) * 1500) / 256;
-	st->magn_raw_to_gauss[2] = (((int32_t)asa[2] + 128) * 1500) / 256;
+	st->magn_raw_to_gauss[0] = (((int32_t)asa[0] + 128) * sensitivity) / 256;
+	st->magn_raw_to_gauss[1] = (((int32_t)asa[1] + 128) * sensitivity) / 256;
+	st->magn_raw_to_gauss[2] = (((int32_t)asa[2] + 128) * sensitivity) / 256;
 
 	return 0;
 }
@@ -129,6 +154,7 @@ static int inv_magn_init(struct inv_mpu6050_state *st)
  */
 int inv_mpu_magn_probe(struct inv_mpu6050_state *st)
 {
+	uint8_t val;
 	int ret;
 
 	/* quit if chip is not supported */
@@ -179,10 +205,17 @@ int inv_mpu_magn_probe(struct inv_mpu6050_state *st)
 	if (ret)
 		return ret;
 
-	/* add 16 bits mode */
-	ret = regmap_write(st->map, INV_MPU6050_REG_I2C_SLV_DO(1),
-			   INV_MPU_MAGN_BITS_MODE_SINGLE |
-			   INV_MPU_MAGN_BIT_OUTPUT_BIT);
+	/* add 16 bits mode for MPU925x */
+	val = INV_MPU_MAGN_BITS_MODE_SINGLE;
+	switch (st->chip_type) {
+	case INV_MPU9250:
+	case INV_MPU9255:
+		val |= INV_MPU9250_MAGN_BIT_OUTPUT_BIT;
+		break;
+	default:
+		break;
+	}
+	ret = regmap_write(st->map, INV_MPU6050_REG_I2C_SLV_DO(1), val);
 	if (ret)
 		return ret;
 
@@ -237,6 +270,7 @@ int inv_mpu_magn_set_orient(struct inv_mpu6050_state *st)
 
 	/* fill magnetometer orientation */
 	switch (st->chip_type) {
+	case INV_MPU9150:
 	case INV_MPU9250:
 	case INV_MPU9255:
 		/* x <- y */
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
index 142692fc0758..ec102d5a5c77 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
@@ -74,7 +74,6 @@ static int inv_mpu_probe(struct spi_device *spi)
 static const struct spi_device_id inv_mpu_id[] = {
 	{"mpu6000", INV_MPU6000},
 	{"mpu6500", INV_MPU6500},
-	{"mpu9150", INV_MPU9150},
 	{"mpu9250", INV_MPU9250},
 	{"mpu9255", INV_MPU9255},
 	{"icm20608", INV_ICM20608},
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
index d7d951927a44..a9c75bc62f18 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
@@ -50,6 +50,7 @@ static void inv_scan_query(struct iio_dev *indio_dev)
 	struct inv_mpu6050_state *st = iio_priv(indio_dev);
 
 	switch (st->chip_type) {
+	case INV_MPU9150:
 	case INV_MPU9250:
 	case INV_MPU9255:
 		return inv_scan_query_mpu9x50(indio_dev);
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
index dc55d7dff3eb..c08f57226ebb 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
@@ -176,21 +176,38 @@ struct st_lsm6dsx_hw_ts_settings {
  * @pullup_en: i2c controller pull-up register info (addr + mask).
  * @aux_sens: aux sensor register info (addr + mask).
  * @wr_once: write_once register info (addr + mask).
+ * @emb_func:  embedded function register info (addr + mask).
+ * @num_ext_dev: max number of slave devices.
  * @shub_out: sensor hub first output register info.
  * @slv0_addr: slave0 address in secondary page.
  * @dw_slv0_addr: slave0 write register address in secondary page.
  * @batch_en: Enable/disable FIFO batching.
+ * @pause: controller pause value.
  */
 struct st_lsm6dsx_shub_settings {
 	struct st_lsm6dsx_reg page_mux;
-	struct st_lsm6dsx_reg master_en;
-	struct st_lsm6dsx_reg pullup_en;
+	struct {
+		bool sec_page;
+		u8 addr;
+		u8 mask;
+	} master_en;
+	struct {
+		bool sec_page;
+		u8 addr;
+		u8 mask;
+	} pullup_en;
 	struct st_lsm6dsx_reg aux_sens;
 	struct st_lsm6dsx_reg wr_once;
-	u8 shub_out;
+	struct st_lsm6dsx_reg emb_func;
+	u8 num_ext_dev;
+	struct {
+		bool sec_page;
+		u8 addr;
+	} shub_out;
 	u8 slv0_addr;
 	u8 dw_slv0_addr;
 	u8 batch_en;
+	u8 pause;
 };
 
 struct st_lsm6dsx_event_settings {
@@ -389,14 +406,17 @@ struct st_lsm6dsx_hw {
 	const struct st_lsm6dsx_settings *settings;
 };
 
-static const struct iio_event_spec st_lsm6dsx_event = {
+static __maybe_unused const struct iio_event_spec st_lsm6dsx_event = {
 	.type = IIO_EV_TYPE_THRESH,
 	.dir = IIO_EV_DIR_EITHER,
 	.mask_separate = BIT(IIO_EV_INFO_VALUE) |
 			 BIT(IIO_EV_INFO_ENABLE)
 };
 
-static const unsigned long st_lsm6dsx_available_scan_masks[] = {0x7, 0x0};
+static __maybe_unused const unsigned long st_lsm6dsx_available_scan_masks[] = {
+	0x7, 0x0,
+};
+
 extern const struct dev_pm_ops st_lsm6dsx_pm_ops;
 
 int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
index cb536b81a1c2..bb899345f2bb 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -336,12 +336,13 @@ static inline int st_lsm6dsx_read_block(struct st_lsm6dsx_hw *hw, u8 addr,
  */
 int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
 {
+	struct st_lsm6dsx_sensor *acc_sensor, *gyro_sensor, *ext_sensor = NULL;
+	int err, acc_sip, gyro_sip, ts_sip, ext_sip, read_len, offset;
 	u16 fifo_len, pattern_len = hw->sip * ST_LSM6DSX_SAMPLE_SIZE;
 	u16 fifo_diff_mask = hw->settings->fifo_ops.fifo_diff.mask;
-	int err, acc_sip, gyro_sip, ts_sip, read_len, offset;
-	struct st_lsm6dsx_sensor *acc_sensor, *gyro_sensor;
 	u8 gyro_buff[ST_LSM6DSX_IIO_BUFF_SIZE];
 	u8 acc_buff[ST_LSM6DSX_IIO_BUFF_SIZE];
+	u8 ext_buff[ST_LSM6DSX_IIO_BUFF_SIZE];
 	bool reset_ts = false;
 	__le16 fifo_status;
 	s64 ts = 0;
@@ -364,6 +365,8 @@ int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
 
 	acc_sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
 	gyro_sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_GYRO]);
+	if (hw->iio_devs[ST_LSM6DSX_ID_EXT0])
+		ext_sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_EXT0]);
 
 	for (read_len = 0; read_len < fifo_len; read_len += pattern_len) {
 		err = st_lsm6dsx_read_block(hw, ST_LSM6DSX_REG_FIFO_OUTL_ADDR,
@@ -391,12 +394,13 @@ int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
 		 * following pattern is repeated every 9 samples:
 		 *   - Gx, Gy, Gz, Ax, Ay, Az, Ts, Gx, Gy, Gz, Ts, Gx, ..
 		 */
+		ext_sip = ext_sensor ? ext_sensor->sip : 0;
 		gyro_sip = gyro_sensor->sip;
 		acc_sip = acc_sensor->sip;
 		ts_sip = hw->ts_sip;
 		offset = 0;
 
-		while (acc_sip > 0 || gyro_sip > 0) {
+		while (acc_sip > 0 || gyro_sip > 0 || ext_sip > 0) {
 			if (gyro_sip > 0) {
 				memcpy(gyro_buff, &hw->buff[offset],
 				       ST_LSM6DSX_SAMPLE_SIZE);
@@ -407,6 +411,11 @@ int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
 				       ST_LSM6DSX_SAMPLE_SIZE);
 				offset += ST_LSM6DSX_SAMPLE_SIZE;
 			}
+			if (ext_sip > 0) {
+				memcpy(ext_buff, &hw->buff[offset],
+				       ST_LSM6DSX_SAMPLE_SIZE);
+				offset += ST_LSM6DSX_SAMPLE_SIZE;
+			}
 
 			if (ts_sip-- > 0) {
 				u8 data[ST_LSM6DSX_SAMPLE_SIZE];
@@ -440,6 +449,10 @@ int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
 				iio_push_to_buffers_with_timestamp(
 					hw->iio_devs[ST_LSM6DSX_ID_ACC],
 					acc_buff, acc_sensor->ts_ref + ts);
+			if (ext_sip-- > 0)
+				iio_push_to_buffers_with_timestamp(
+					hw->iio_devs[ST_LSM6DSX_ID_EXT0],
+					ext_buff, ext_sensor->ts_ref + ts);
 		}
 	}
 
@@ -638,12 +651,12 @@ int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable)
 		err = st_lsm6dsx_sensor_set_enable(sensor, enable);
 		if (err < 0)
 			goto out;
-
-		err = st_lsm6dsx_set_fifo_odr(sensor, enable);
-		if (err < 0)
-			goto out;
 	}
 
+	err = st_lsm6dsx_set_fifo_odr(sensor, enable);
+	if (err < 0)
+		goto out;
+
 	err = st_lsm6dsx_update_decimators(hw);
 	if (err < 0)
 		goto out;
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index a7d40c02ce6b..d205b994a9e0 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -54,6 +54,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/pm.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/bitfield.h>
 
@@ -655,6 +656,10 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.addr = 0x08,
 				.mask = GENMASK(5, 3),
 			},
+			[ST_LSM6DSX_ID_EXT0] = {
+				.addr = 0x09,
+				.mask = GENMASK(2, 0),
+			},
 		},
 		.fifo_ops = {
 			.update_fifo = st_lsm6dsx_update_fifo,
@@ -687,6 +692,39 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.mask = GENMASK(5, 3),
 			},
 		},
+		.shub_settings = {
+			.page_mux = {
+				.addr = 0x01,
+				.mask = BIT(7),
+			},
+			.master_en = {
+				.addr = 0x1a,
+				.mask = BIT(0),
+			},
+			.pullup_en = {
+				.addr = 0x1a,
+				.mask = BIT(3),
+			},
+			.aux_sens = {
+				.addr = 0x04,
+				.mask = GENMASK(5, 4),
+			},
+			.wr_once = {
+				.addr = 0x07,
+				.mask = BIT(5),
+			},
+			.emb_func = {
+				.addr = 0x19,
+				.mask = BIT(2),
+			},
+			.num_ext_dev = 1,
+			.shub_out = {
+				.addr = 0x2e,
+			},
+			.slv0_addr = 0x02,
+			.dw_slv0_addr = 0x0e,
+			.pause = 0x7,
+		},
 		.event_settings = {
 			.enable_reg = {
 				.addr = 0x58,
@@ -867,10 +905,12 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.mask = BIT(6),
 			},
 			.master_en = {
+				.sec_page = true,
 				.addr = 0x14,
 				.mask = BIT(2),
 			},
 			.pullup_en = {
+				.sec_page = true,
 				.addr = 0x14,
 				.mask = BIT(3),
 			},
@@ -882,7 +922,11 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.addr = 0x14,
 				.mask = BIT(6),
 			},
-			.shub_out = 0x02,
+			.num_ext_dev = 3,
+			.shub_out = {
+				.sec_page = true,
+				.addr = 0x02,
+			},
 			.slv0_addr = 0x15,
 			.dw_slv0_addr = 0x21,
 			.batch_en = BIT(3),
@@ -1241,10 +1285,12 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.mask = BIT(6),
 			},
 			.master_en = {
+				.sec_page = true,
 				.addr = 0x14,
 				.mask = BIT(2),
 			},
 			.pullup_en = {
+				.sec_page = true,
 				.addr = 0x14,
 				.mask = BIT(3),
 			},
@@ -1256,7 +1302,11 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.addr = 0x14,
 				.mask = BIT(6),
 			},
-			.shub_out = 0x02,
+			.num_ext_dev = 3,
+			.shub_out = {
+				.sec_page = true,
+				.addr = 0x02,
+			},
 			.slv0_addr = 0x15,
 			.dw_slv0_addr = 0x21,
 			.batch_en = BIT(3),
@@ -1608,11 +1658,11 @@ static int st_lsm6dsx_event_setup(struct st_lsm6dsx_hw *hw, int state)
 }
 
 static int st_lsm6dsx_read_event(struct iio_dev *iio_dev,
-				   const struct iio_chan_spec *chan,
-				   enum iio_event_type type,
-				   enum iio_event_direction dir,
-				   enum iio_event_info info,
-				   int *val, int *val2)
+				 const struct iio_chan_spec *chan,
+				 enum iio_event_type type,
+				 enum iio_event_direction dir,
+				 enum iio_event_info info,
+				 int *val, int *val2)
 {
 	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
 	struct st_lsm6dsx_hw *hw = sensor->hw;
@@ -1826,14 +1876,14 @@ static const struct iio_info st_lsm6dsx_gyro_info = {
 	.hwfifo_set_watermark = st_lsm6dsx_set_watermark,
 };
 
-static int st_lsm6dsx_of_get_drdy_pin(struct st_lsm6dsx_hw *hw, int *drdy_pin)
+static int st_lsm6dsx_get_drdy_pin(struct st_lsm6dsx_hw *hw, int *drdy_pin)
 {
-	struct device_node *np = hw->dev->of_node;
+	struct device *dev = hw->dev;
 
-	if (!np)
+	if (!dev_fwnode(dev))
 		return -EINVAL;
 
-	return of_property_read_u32(np, "st,drdy-int-pin", drdy_pin);
+	return device_property_read_u32(dev, "st,drdy-int-pin", drdy_pin);
 }
 
 static int
@@ -1842,7 +1892,7 @@ st_lsm6dsx_get_drdy_reg(struct st_lsm6dsx_hw *hw,
 {
 	int err = 0, drdy_pin;
 
-	if (st_lsm6dsx_of_get_drdy_pin(hw, &drdy_pin) < 0) {
+	if (st_lsm6dsx_get_drdy_pin(hw, &drdy_pin) < 0) {
 		struct st_sensors_platform_data *pdata;
 		struct device *dev = hw->dev;
 
@@ -1871,26 +1921,29 @@ st_lsm6dsx_get_drdy_reg(struct st_lsm6dsx_hw *hw,
 static int st_lsm6dsx_init_shub(struct st_lsm6dsx_hw *hw)
 {
 	const struct st_lsm6dsx_shub_settings *hub_settings;
-	struct device_node *np = hw->dev->of_node;
 	struct st_sensors_platform_data *pdata;
+	struct device *dev = hw->dev;
 	unsigned int data;
 	int err = 0;
 
 	hub_settings = &hw->settings->shub_settings;
 
-	pdata = (struct st_sensors_platform_data *)hw->dev->platform_data;
-	if ((np && of_property_read_bool(np, "st,pullups")) ||
+	pdata = (struct st_sensors_platform_data *)dev->platform_data;
+	if ((dev_fwnode(dev) && device_property_read_bool(dev, "st,pullups")) ||
 	    (pdata && pdata->pullups)) {
-		err = st_lsm6dsx_set_page(hw, true);
-		if (err < 0)
-			return err;
+		if (hub_settings->pullup_en.sec_page) {
+			err = st_lsm6dsx_set_page(hw, true);
+			if (err < 0)
+				return err;
+		}
 
 		data = ST_LSM6DSX_SHIFT_VAL(1, hub_settings->pullup_en.mask);
 		err = regmap_update_bits(hw->regmap,
 					 hub_settings->pullup_en.addr,
 					 hub_settings->pullup_en.mask, data);
 
-		st_lsm6dsx_set_page(hw, false);
+		if (hub_settings->pullup_en.sec_page)
+			st_lsm6dsx_set_page(hw, false);
 
 		if (err < 0)
 			return err;
@@ -1908,6 +1961,16 @@ static int st_lsm6dsx_init_shub(struct st_lsm6dsx_hw *hw)
 					 hub_settings->aux_sens.mask, data);
 
 		st_lsm6dsx_set_page(hw, false);
+
+		if (err < 0)
+			return err;
+	}
+
+	if (hub_settings->emb_func.addr) {
+		data = ST_LSM6DSX_SHIFT_VAL(1, hub_settings->emb_func.mask);
+		err = regmap_update_bits(hw->regmap,
+					 hub_settings->emb_func.addr,
+					 hub_settings->emb_func.mask, data);
 	}
 
 	return err;
@@ -2157,9 +2220,9 @@ static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
 
 static int st_lsm6dsx_irq_setup(struct st_lsm6dsx_hw *hw)
 {
-	struct device_node *np = hw->dev->of_node;
 	struct st_sensors_platform_data *pdata;
 	const struct st_lsm6dsx_reg *reg;
+	struct device *dev = hw->dev;
 	unsigned long irq_type;
 	bool irq_active_low;
 	int err;
@@ -2187,8 +2250,8 @@ static int st_lsm6dsx_irq_setup(struct st_lsm6dsx_hw *hw)
 	if (err < 0)
 		return err;
 
-	pdata = (struct st_sensors_platform_data *)hw->dev->platform_data;
-	if ((np && of_property_read_bool(np, "drive-open-drain")) ||
+	pdata = (struct st_sensors_platform_data *)dev->platform_data;
+	if ((dev_fwnode(dev) && device_property_read_bool(dev, "drive-open-drain")) ||
 	    (pdata && pdata->open_drain)) {
 		reg = &hw->settings->irq_config.od;
 		err = regmap_update_bits(hw->regmap, reg->addr, reg->mask,
@@ -2218,7 +2281,6 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
 {
 	struct st_sensors_platform_data *pdata = dev->platform_data;
 	const struct st_lsm6dsx_shub_settings *hub_settings;
-	struct device_node *np = dev->of_node;
 	struct st_lsm6dsx_hw *hw;
 	const char *name = NULL;
 	int i, err;
@@ -2281,7 +2343,7 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id,
 			return err;
 	}
 
-	if ((np && of_property_read_bool(np, "wakeup-source")) ||
+	if ((dev_fwnode(dev) && device_property_read_bool(dev, "wakeup-source")) ||
 	    (pdata && pdata->wakeup_source))
 		device_init_wakeup(dev, true);
 
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
index cd47ec1fedcb..0fb32131afce 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
@@ -12,7 +12,6 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
-#include <linux/of.h>
 #include <linux/regmap.h>
 
 #include "st_lsm6dsx.h"
@@ -122,7 +121,7 @@ static struct i2c_driver st_lsm6dsx_driver = {
 	.driver = {
 		.name = "st_lsm6dsx_i2c",
 		.pm = &st_lsm6dsx_pm_ops,
-		.of_match_table = of_match_ptr(st_lsm6dsx_i2c_of_match),
+		.of_match_table = st_lsm6dsx_i2c_of_match,
 	},
 	.probe = st_lsm6dsx_i2c_probe,
 	.id_table = st_lsm6dsx_i2c_id_table,
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c
index fa5d1001a46c..eea555617d4a 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c
@@ -30,7 +30,6 @@
 
 #include "st_lsm6dsx.h"
 
-#define ST_LSM6DSX_MAX_SLV_NUM			3
 #define ST_LSM6DSX_SLV_ADDR(n, base)		((base) + (n) * 3)
 #define ST_LSM6DSX_SLV_SUB_ADDR(n, base)	((base) + 1 + (n) * 3)
 #define ST_LSM6DSX_SLV_CONFIG(n, base)		((base) + 2 + (n) * 3)
@@ -102,24 +101,31 @@ static void st_lsm6dsx_shub_wait_complete(struct st_lsm6dsx_hw *hw)
 }
 
 /**
- * st_lsm6dsx_shub_read_reg - read i2c controller register
+ * st_lsm6dsx_shub_read_output - read i2c controller register
  *
  * Read st_lsm6dsx i2c controller register
  */
-static int st_lsm6dsx_shub_read_reg(struct st_lsm6dsx_hw *hw, u8 addr,
-				    u8 *data, int len)
+static int
+st_lsm6dsx_shub_read_output(struct st_lsm6dsx_hw *hw, u8 *data,
+			    int len)
 {
+	const struct st_lsm6dsx_shub_settings *hub_settings;
 	int err;
 
 	mutex_lock(&hw->page_lock);
 
-	err = st_lsm6dsx_set_page(hw, true);
-	if (err < 0)
-		goto out;
+	hub_settings = &hw->settings->shub_settings;
+	if (hub_settings->shub_out.sec_page) {
+		err = st_lsm6dsx_set_page(hw, true);
+		if (err < 0)
+			goto out;
+	}
 
-	err = regmap_bulk_read(hw->regmap, addr, data, len);
+	err = regmap_bulk_read(hw->regmap, hub_settings->shub_out.addr,
+			       data, len);
 
-	st_lsm6dsx_set_page(hw, false);
+	if (hub_settings->shub_out.sec_page)
+		st_lsm6dsx_set_page(hw, false);
 out:
 	mutex_unlock(&hw->page_lock);
 
@@ -186,15 +192,18 @@ static int st_lsm6dsx_shub_master_enable(struct st_lsm6dsx_sensor *sensor,
 	mutex_lock(&hw->page_lock);
 
 	hub_settings = &hw->settings->shub_settings;
-	err = st_lsm6dsx_set_page(hw, true);
-	if (err < 0)
-		goto out;
+	if (hub_settings->master_en.sec_page) {
+		err = st_lsm6dsx_set_page(hw, true);
+		if (err < 0)
+			goto out;
+	}
 
 	data = ST_LSM6DSX_SHIFT_VAL(enable, hub_settings->master_en.mask);
 	err = regmap_update_bits(hw->regmap, hub_settings->master_en.addr,
 				 hub_settings->master_en.mask, data);
 
-	st_lsm6dsx_set_page(hw, false);
+	if (hub_settings->master_en.sec_page)
+		st_lsm6dsx_set_page(hw, false);
 out:
 	mutex_unlock(&hw->page_lock);
 
@@ -212,16 +221,21 @@ st_lsm6dsx_shub_read(struct st_lsm6dsx_sensor *sensor, u8 addr,
 		     u8 *data, int len)
 {
 	const struct st_lsm6dsx_shub_settings *hub_settings;
+	u8 config[3], slv_addr, slv_config = 0;
 	struct st_lsm6dsx_hw *hw = sensor->hw;
-	u8 config[3], slv_addr;
+	const struct st_lsm6dsx_reg *aux_sens;
 	int err;
 
 	hub_settings = &hw->settings->shub_settings;
 	slv_addr = ST_LSM6DSX_SLV_ADDR(0, hub_settings->slv0_addr);
+	aux_sens = &hw->settings->shub_settings.aux_sens;
+	/* do not overwrite aux_sens */
+	if (slv_addr + 2 == aux_sens->addr)
+		slv_config = ST_LSM6DSX_SHIFT_VAL(3, aux_sens->mask);
 
 	config[0] = (sensor->ext_info.addr << 1) | 1;
 	config[1] = addr;
-	config[2] = len & ST_LS6DSX_READ_OP_MASK;
+	config[2] = (len & ST_LS6DSX_READ_OP_MASK) | slv_config;
 
 	err = st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 					sizeof(config));
@@ -234,12 +248,14 @@ st_lsm6dsx_shub_read(struct st_lsm6dsx_sensor *sensor, u8 addr,
 
 	st_lsm6dsx_shub_wait_complete(hw);
 
-	err = st_lsm6dsx_shub_read_reg(hw, hub_settings->shub_out, data,
-				       len & ST_LS6DSX_READ_OP_MASK);
+	err = st_lsm6dsx_shub_read_output(hw, data,
+					  len & ST_LS6DSX_READ_OP_MASK);
 
 	st_lsm6dsx_shub_master_enable(sensor, false);
 
-	memset(config, 0, sizeof(config));
+	config[0] = hub_settings->pause;
+	config[1] = 0;
+	config[2] = slv_config;
 	return st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 					 sizeof(config));
 }
@@ -296,7 +312,8 @@ st_lsm6dsx_shub_write(struct st_lsm6dsx_sensor *sensor, u8 addr,
 		st_lsm6dsx_shub_master_enable(sensor, false);
 	}
 
-	memset(config, 0, sizeof(config));
+	config[0] = hub_settings->pause;
+	config[1] = 0;
 	return st_lsm6dsx_shub_write_reg(hw, slv_addr, config, sizeof(config));
 }
 
@@ -688,14 +705,19 @@ st_lsm6dsx_shub_check_wai(struct st_lsm6dsx_hw *hw, u8 *i2c_addr,
 			  const struct st_lsm6dsx_ext_dev_settings *settings)
 {
 	const struct st_lsm6dsx_shub_settings *hub_settings;
+	u8 config[3], data, slv_addr, slv_config = 0;
+	const struct st_lsm6dsx_reg *aux_sens;
 	struct st_lsm6dsx_sensor *sensor;
-	u8 config[3], data, slv_addr;
 	bool found = false;
 	int i, err;
 
+	sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
 	hub_settings = &hw->settings->shub_settings;
+	aux_sens = &hw->settings->shub_settings.aux_sens;
 	slv_addr = ST_LSM6DSX_SLV_ADDR(0, hub_settings->slv0_addr);
-	sensor = iio_priv(hw->iio_devs[ST_LSM6DSX_ID_ACC]);
+	/* do not overwrite aux_sens */
+	if (slv_addr + 2 == aux_sens->addr)
+		slv_config = ST_LSM6DSX_SHIFT_VAL(3, aux_sens->mask);
 
 	for (i = 0; i < ARRAY_SIZE(settings->i2c_addr); i++) {
 		if (!settings->i2c_addr[i])
@@ -704,7 +726,7 @@ st_lsm6dsx_shub_check_wai(struct st_lsm6dsx_hw *hw, u8 *i2c_addr,
 		/* read wai slave register */
 		config[0] = (settings->i2c_addr[i] << 1) | 0x1;
 		config[1] = settings->wai.addr;
-		config[2] = 0x1;
+		config[2] = 0x1 | slv_config;
 
 		err = st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 						sizeof(config));
@@ -717,9 +739,7 @@ st_lsm6dsx_shub_check_wai(struct st_lsm6dsx_hw *hw, u8 *i2c_addr,
 
 		st_lsm6dsx_shub_wait_complete(hw);
 
-		err = st_lsm6dsx_shub_read_reg(hw,
-					       hub_settings->shub_out,
-					       &data, sizeof(data));
+		err = st_lsm6dsx_shub_read_output(hw, &data, sizeof(data));
 
 		st_lsm6dsx_shub_master_enable(sensor, false);
 
@@ -735,7 +755,9 @@ st_lsm6dsx_shub_check_wai(struct st_lsm6dsx_hw *hw, u8 *i2c_addr,
 	}
 
 	/* reset SLV0 channel */
-	memset(config, 0, sizeof(config));
+	config[0] = hub_settings->pause;
+	config[1] = 0;
+	config[2] = slv_config;
 	err = st_lsm6dsx_shub_write_reg(hw, slv_addr, config,
 					sizeof(config));
 	if (err < 0)
@@ -770,7 +792,7 @@ int st_lsm6dsx_shub_probe(struct st_lsm6dsx_hw *hw, const char *name)
 		if (err < 0)
 			return err;
 
-		if (++num_ext_dev >= ST_LSM6DSX_MAX_SLV_NUM)
+		if (++num_ext_dev >= hw->settings->shub_settings.num_ext_dev)
 			break;
 		id++;
 	}
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c
index 67ff36eac247..eb1086e4a951 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c
@@ -12,7 +12,6 @@
 #include <linux/module.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
-#include <linux/of.h>
 #include <linux/regmap.h>
 
 #include "st_lsm6dsx.h"
@@ -122,7 +121,7 @@ static struct spi_driver st_lsm6dsx_driver = {
 	.driver = {
 		.name = "st_lsm6dsx_spi",
 		.pm = &st_lsm6dsx_pm_ops,
-		.of_match_table = of_match_ptr(st_lsm6dsx_spi_of_match),
+		.of_match_table = st_lsm6dsx_spi_of_match,
 	},
 	.probe = st_lsm6dsx_spi_probe,
 	.id_table = st_lsm6dsx_spi_id_table,
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index c193d64e5217..dbbf0cf4cac9 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -87,7 +87,7 @@ static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf,
 }
 
 /**
- * iio_buffer_read_first_n_outer() - chrdev read for buffer access
+ * iio_buffer_read_outer() - chrdev read for buffer access
  * @filp:	File structure pointer for the char device
  * @buf:	Destination buffer for iio buffer read
  * @n:		First n bytes to read
@@ -99,8 +99,8 @@ static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf,
  * Return: negative values corresponding to error codes or ret != 0
  *	   for ending the reading activity
  **/
-ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
-				      size_t n, loff_t *f_ps)
+ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
+			      size_t n, loff_t *f_ps)
 {
 	struct iio_dev *indio_dev = filp->private_data;
 	struct iio_buffer *rb = indio_dev->buffer;
@@ -112,7 +112,7 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
 	if (!indio_dev->info)
 		return -ENODEV;
 
-	if (!rb || !rb->access->read_first_n)
+	if (!rb || !rb->access->read)
 		return -EINVAL;
 
 	datum_size = rb->bytes_per_datum;
@@ -147,7 +147,7 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
 			continue;
 		}
 
-		ret = rb->access->read_first_n(rb, n, buf);
+		ret = rb->access->read(rb, n, buf);
 		if (ret == 0 && (filp->f_flags & O_NONBLOCK))
 			ret = -EAGAIN;
 	} while (ret == 0);
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index a46cdf2d8833..65ff0d067018 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -161,6 +161,7 @@ static const char * const iio_chan_info_postfix[] = {
 	[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
 	[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
 	[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
+	[IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
 };
 
 /**
@@ -596,6 +597,8 @@ static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
 		}
 		return l;
 	}
+	case IIO_VAL_CHAR:
+		return snprintf(buf, len, "%c", (char)vals[0]);
 	default:
 		return 0;
 	}
@@ -837,7 +840,8 @@ static ssize_t iio_write_channel_info(struct device *dev,
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	int ret, fract_mult = 100000;
-	int integer, fract;
+	int integer, fract = 0;
+	bool is_char = false;
 
 	/* Assumes decimal - precision based on number of digits */
 	if (!indio_dev->info->write_raw)
@@ -855,13 +859,24 @@ static ssize_t iio_write_channel_info(struct device *dev,
 		case IIO_VAL_INT_PLUS_NANO:
 			fract_mult = 100000000;
 			break;
+		case IIO_VAL_CHAR:
+			is_char = true;
+			break;
 		default:
 			return -EINVAL;
 		}
 
-	ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
-	if (ret)
-		return ret;
+	if (is_char) {
+		char ch;
+
+		if (sscanf(buf, "%c", &ch) != 1)
+			return -EINVAL;
+		integer = ch;
+	} else {
+		ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
+		if (ret)
+			return ret;
+	}
 
 	ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
 					 integer, fract, this_attr->address);
@@ -1617,7 +1632,7 @@ static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 }
 
 static const struct file_operations iio_buffer_fileops = {
-	.read = iio_buffer_read_first_n_outer_addr,
+	.read = iio_buffer_read_outer_addr,
 	.release = iio_chrdev_release,
 	.open = iio_chrdev_open,
 	.poll = iio_buffer_poll_addr,
diff --git a/drivers/iio/light/apds9960.c b/drivers/iio/light/apds9960.c
index c5dfb9a6b5a1..52f86bc777dd 100644
--- a/drivers/iio/light/apds9960.c
+++ b/drivers/iio/light/apds9960.c
@@ -15,7 +15,6 @@
 #include <linux/mutex.h>
 #include <linux/err.h>
 #include <linux/irq.h>
-#include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
@@ -24,7 +23,6 @@
 #include <linux/iio/events.h>
 #include <linux/iio/kfifo_buf.h>
 #include <linux/iio/sysfs.h>
-#include <linux/of_gpio.h>
 
 #define APDS9960_REGMAP_NAME	"apds9960_regmap"
 #define APDS9960_DRV_NAME	"apds9960"
diff --git a/drivers/iio/light/lm3533-als.c b/drivers/iio/light/lm3533-als.c
index 6733b52c22df..bc196c212881 100644
--- a/drivers/iio/light/lm3533-als.c
+++ b/drivers/iio/light/lm3533-als.c
@@ -742,7 +742,7 @@ static int lm3533_als_set_resistor(struct lm3533_als *als, u8 val)
 	if (val < LM3533_ALS_RESISTOR_MIN || val > LM3533_ALS_RESISTOR_MAX) {
 		dev_err(&als->pdev->dev, "invalid resistor value\n");
 		return -EINVAL;
-	};
+	}
 
 	ret = lm3533_write(als->lm3533, LM3533_REG_ALS_RESISTOR_SELECT, val);
 	if (ret) {
diff --git a/drivers/iio/light/si1145.c b/drivers/iio/light/si1145.c
index 982bba0c54e7..0476c2bc8138 100644
--- a/drivers/iio/light/si1145.c
+++ b/drivers/iio/light/si1145.c
@@ -17,7 +17,6 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/irq.h>
-#include <linux/gpio.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
diff --git a/drivers/iio/light/st_uvis25_i2c.c b/drivers/iio/light/st_uvis25_i2c.c
index dacbac6a6662..4889bbeb0c73 100644
--- a/drivers/iio/light/st_uvis25_i2c.c
+++ b/drivers/iio/light/st_uvis25_i2c.c
@@ -9,7 +9,6 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/acpi.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/regmap.h>
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 893bec5a0312..55cffaa82456 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -16,8 +16,7 @@
 #include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/bitops.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/acpi.h>
 #include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
@@ -360,7 +359,7 @@ struct ak8975_data {
 	struct mutex		lock;
 	u8			asa[3];
 	long			raw_to_gauss[3];
-	int			eoc_gpio;
+	struct gpio_desc	*eoc_gpiod;
 	int			eoc_irq;
 	wait_queue_head_t	data_ready_queue;
 	unsigned long		flags;
@@ -498,15 +497,13 @@ static int ak8975_setup_irq(struct ak8975_data *data)
 	if (client->irq)
 		irq = client->irq;
 	else
-		irq = gpio_to_irq(data->eoc_gpio);
+		irq = gpiod_to_irq(data->eoc_gpiod);
 
 	rc = devm_request_irq(&client->dev, irq, ak8975_irq_handler,
 			      IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 			      dev_name(&client->dev), data);
 	if (rc < 0) {
-		dev_err(&client->dev,
-			"irq %d request failed, (gpio %d): %d\n",
-			irq, data->eoc_gpio, rc);
+		dev_err(&client->dev, "irq %d request failed: %d\n", irq, rc);
 		return rc;
 	}
 
@@ -549,7 +546,7 @@ static int ak8975_setup(struct i2c_client *client)
 		return ret;
 	}
 
-	if (data->eoc_gpio > 0 || client->irq > 0) {
+	if (data->eoc_gpiod || client->irq > 0) {
 		ret = ak8975_setup_irq(data);
 		if (ret < 0) {
 			dev_err(&client->dev,
@@ -574,7 +571,7 @@ static int wait_conversion_complete_gpio(struct ak8975_data *data)
 	/* Wait for the conversion to complete. */
 	while (timeout_ms) {
 		msleep(AK8975_CONVERSION_DONE_POLL_TIME);
-		if (gpio_get_value(data->eoc_gpio))
+		if (gpiod_get_value(data->eoc_gpiod))
 			break;
 		timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME;
 	}
@@ -646,7 +643,7 @@ static int ak8975_start_read_axis(struct ak8975_data *data,
 	/* Wait for the conversion to complete. */
 	if (data->eoc_irq)
 		ret = wait_conversion_complete_interrupt(data);
-	else if (gpio_is_valid(data->eoc_gpio))
+	else if (data->eoc_gpiod)
 		ret = wait_conversion_complete_gpio(data);
 	else
 		ret = wait_conversion_complete_polled(data);
@@ -856,36 +853,23 @@ static int ak8975_probe(struct i2c_client *client,
 {
 	struct ak8975_data *data;
 	struct iio_dev *indio_dev;
-	int eoc_gpio;
+	struct gpio_desc *eoc_gpiod;
 	int err;
 	const char *name = NULL;
 	enum asahi_compass_chipset chipset = AK_MAX_TYPE;
 	const struct ak8975_platform_data *pdata =
 		dev_get_platdata(&client->dev);
 
-	/* Grab and set up the supplied GPIO. */
-	if (pdata)
-		eoc_gpio = pdata->eoc_gpio;
-	else if (client->dev.of_node)
-		eoc_gpio = of_get_gpio(client->dev.of_node, 0);
-	else
-		eoc_gpio = -1;
-
-	if (eoc_gpio == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-
-	/* We may not have a GPIO based IRQ to scan, that is fine, we will
-	   poll if so */
-	if (gpio_is_valid(eoc_gpio)) {
-		err = devm_gpio_request_one(&client->dev, eoc_gpio,
-							GPIOF_IN, "ak_8975");
-		if (err < 0) {
-			dev_err(&client->dev,
-				"failed to request GPIO %d, error %d\n",
-							eoc_gpio, err);
-			return err;
-		}
-	}
+	/*
+	 * Grab and set up the supplied GPIO.
+	 * We may not have a GPIO based IRQ to scan, that is fine, we will
+	 * poll if so.
+	 */
+	eoc_gpiod = devm_gpiod_get_optional(&client->dev, NULL, GPIOD_IN);
+	if (IS_ERR(eoc_gpiod))
+		return PTR_ERR(eoc_gpiod);
+	if (eoc_gpiod)
+		gpiod_set_consumer_name(eoc_gpiod, "ak_8975");
 
 	/* Register with IIO */
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
@@ -896,7 +880,7 @@ static int ak8975_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, indio_dev);
 
 	data->client = client;
-	data->eoc_gpio = eoc_gpio;
+	data->eoc_gpiod = eoc_gpiod;
 	data->eoc_irq = 0;
 
 	if (!pdata) {
diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index ba420e484787..9c2d9bf8f100 100644
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -53,6 +53,18 @@ config IIO_CROS_EC_BARO
 	  To compile this driver as a module, choose M here: the module
 	  will be called cros_ec_baro.
 
+config DLHL60D
+	tristate "All Sensors DLHL60D and DLHL60G low voltage digital pressure sensors"
+	depends on I2C
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	help
+	  Say yes here to build support for the All Sensors DLH series
+	  pressure sensors driver.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called dlhl60d.
+
 config DPS310
 	tristate "Infineon DPS310 pressure and temperature sensor"
 	depends on I2C
diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
index d8f5ace1f25d..5a79192d8cb5 100644
--- a/drivers/iio/pressure/Makefile
+++ b/drivers/iio/pressure/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_BMP280) += bmp280.o
 bmp280-objs := bmp280-core.o bmp280-regmap.o
 obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
 obj-$(CONFIG_BMP280_SPI) += bmp280-spi.o
+obj-$(CONFIG_DLHL60D) += dlhl60d.o
 obj-$(CONFIG_DPS310) += dps310.o
 obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o
 obj-$(CONFIG_HID_SENSOR_PRESS)   += hid-sensor-press.o
diff --git a/drivers/iio/pressure/bmp280-i2c.c b/drivers/iio/pressure/bmp280-i2c.c
index 3109c8e2cc11..8b03ea15c0d0 100644
--- a/drivers/iio/pressure/bmp280-i2c.c
+++ b/drivers/iio/pressure/bmp280-i2c.c
@@ -1,8 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include <linux/module.h>
 #include <linux/i2c.h>
-#include <linux/acpi.h>
-#include <linux/of.h>
 #include <linux/regmap.h>
 
 #include "bmp280.h"
@@ -38,16 +36,6 @@ static int bmp280_i2c_probe(struct i2c_client *client,
 				   client->irq);
 }
 
-static const struct acpi_device_id bmp280_acpi_i2c_match[] = {
-	{"BMP0280", BMP280_CHIP_ID },
-	{"BMP0180", BMP180_CHIP_ID },
-	{"BMP0085", BMP180_CHIP_ID },
-	{"BME0280", BME280_CHIP_ID },
-	{ },
-};
-MODULE_DEVICE_TABLE(acpi, bmp280_acpi_i2c_match);
-
-#ifdef CONFIG_OF
 static const struct of_device_id bmp280_of_i2c_match[] = {
 	{ .compatible = "bosch,bme280", .data = (void *)BME280_CHIP_ID },
 	{ .compatible = "bosch,bmp280", .data = (void *)BMP280_CHIP_ID },
@@ -56,9 +44,6 @@ static const struct of_device_id bmp280_of_i2c_match[] = {
 	{ },
 };
 MODULE_DEVICE_TABLE(of, bmp280_of_i2c_match);
-#else
-#define bmp280_of_i2c_match NULL
-#endif
 
 static const struct i2c_device_id bmp280_i2c_id[] = {
 	{"bmp280", BMP280_CHIP_ID },
@@ -72,8 +57,7 @@ MODULE_DEVICE_TABLE(i2c, bmp280_i2c_id);
 static struct i2c_driver bmp280_i2c_driver = {
 	.driver = {
 		.name	= "bmp280",
-		.acpi_match_table = ACPI_PTR(bmp280_acpi_i2c_match),
-		.of_match_table = of_match_ptr(bmp280_of_i2c_match),
+		.of_match_table = bmp280_of_i2c_match,
 		.pm = &bmp280_dev_pm_ops,
 	},
 	.probe		= bmp280_i2c_probe,
diff --git a/drivers/iio/pressure/dlhl60d.c b/drivers/iio/pressure/dlhl60d.c
new file mode 100644
index 000000000000..b8c99e7bd6cf
--- /dev/null
+++ b/drivers/iio/pressure/dlhl60d.c
@@ -0,0 +1,375 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * All Sensors DLH series low voltage digital pressure sensors
+ *
+ * Copyright (c) 2019 AVL DiTEST GmbH
+ *   Tomislav Denis <tomislav.denis@avl.com>
+ *
+ * Datasheet: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <asm/unaligned.h>
+
+/* Commands */
+#define DLH_START_SINGLE    0xAA
+
+/* Status bits */
+#define DLH_STATUS_OK       0x40
+
+/* DLH  data format */
+#define DLH_NUM_READ_BYTES  7
+#define DLH_NUM_DATA_BYTES  3
+#define DLH_NUM_PR_BITS     24
+#define DLH_NUM_TEMP_BITS   24
+
+/* DLH  timings */
+#define DLH_SINGLE_DUT_MS   5
+
+enum dhl_ids {
+	dlhl60d,
+	dlhl60g,
+};
+
+struct dlh_info {
+	u8 osdig;           /* digital offset factor */
+	unsigned int fss;   /* full scale span (inch H2O) */
+};
+
+struct dlh_state {
+	struct i2c_client *client;
+	struct dlh_info info;
+	bool use_interrupt;
+	struct completion completion;
+	u8 rx_buf[DLH_NUM_READ_BYTES] ____cacheline_aligned;
+};
+
+static struct dlh_info dlh_info_tbl[] = {
+	[dlhl60d] = {
+		.osdig = 2,
+		.fss = 120,
+	},
+	[dlhl60g] = {
+		.osdig = 10,
+		.fss = 60,
+	},
+};
+
+
+static int dlh_cmd_start_single(struct dlh_state *st)
+{
+	int ret;
+
+	ret = i2c_smbus_write_byte(st->client, DLH_START_SINGLE);
+	if (ret)
+		dev_err(&st->client->dev,
+			"%s: I2C write byte failed\n", __func__);
+
+	return ret;
+}
+
+static int dlh_cmd_read_data(struct dlh_state *st)
+{
+	int ret;
+
+	ret = i2c_master_recv(st->client, st->rx_buf, DLH_NUM_READ_BYTES);
+	if (ret < 0) {
+		dev_err(&st->client->dev,
+			"%s: I2C read block failed\n", __func__);
+		return ret;
+	}
+
+	if (st->rx_buf[0] != DLH_STATUS_OK) {
+		dev_err(&st->client->dev,
+			"%s: invalid status 0x%02x\n", __func__, st->rx_buf[0]);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int dlh_start_capture_and_read(struct dlh_state *st)
+{
+	int ret;
+
+	if (st->use_interrupt)
+		reinit_completion(&st->completion);
+
+	ret = dlh_cmd_start_single(st);
+	if (ret)
+		return ret;
+
+	if (st->use_interrupt) {
+		ret = wait_for_completion_timeout(&st->completion,
+			msecs_to_jiffies(DLH_SINGLE_DUT_MS));
+		if (!ret) {
+			dev_err(&st->client->dev,
+				"%s: conversion timed out\n", __func__);
+			return -ETIMEDOUT;
+		}
+	} else {
+		mdelay(DLH_SINGLE_DUT_MS);
+	}
+
+	return dlh_cmd_read_data(st);
+}
+
+static int dlh_read_direct(struct dlh_state *st,
+	unsigned int *pressure, unsigned int *temperature)
+{
+	int ret;
+
+	ret = dlh_start_capture_and_read(st);
+	if (ret)
+		return ret;
+
+	*pressure = get_unaligned_be32(&st->rx_buf[1]) >> 8;
+	*temperature = get_unaligned_be32(&st->rx_buf[3]) &
+		GENMASK(DLH_NUM_TEMP_BITS - 1, 0);
+
+	return 0;
+}
+
+static int dlh_read_raw(struct iio_dev *indio_dev,
+	struct iio_chan_spec const *channel, int *value,
+	int *value2, long mask)
+{
+	struct dlh_state *st = iio_priv(indio_dev);
+	unsigned int pressure, temperature;
+	int ret;
+	s64 tmp;
+	s32 rem;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		ret = dlh_read_direct(st, &pressure, &temperature);
+		iio_device_release_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		switch (channel->type) {
+		case IIO_PRESSURE:
+			*value = pressure;
+			return IIO_VAL_INT;
+
+		case IIO_TEMP:
+			*value = temperature;
+			return IIO_VAL_INT;
+
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_SCALE:
+		switch (channel->type) {
+		case IIO_PRESSURE:
+			tmp = div_s64(125LL * st->info.fss * 24909 * 100,
+				1 << DLH_NUM_PR_BITS);
+			tmp = div_s64_rem(tmp, 1000000000LL, &rem);
+			*value = tmp;
+			*value2 = rem;
+			return IIO_VAL_INT_PLUS_NANO;
+
+		case IIO_TEMP:
+			*value = 125 * 1000;
+			*value2 = DLH_NUM_TEMP_BITS;
+			return IIO_VAL_FRACTIONAL_LOG2;
+
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_OFFSET:
+		switch (channel->type) {
+		case IIO_PRESSURE:
+			*value = -125 * st->info.fss * 24909;
+			*value2 = 100 * st->info.osdig * 100000;
+			return IIO_VAL_FRACTIONAL;
+
+		case IIO_TEMP:
+			*value = -40 * 1000;
+			return IIO_VAL_INT;
+
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_info dlh_info = {
+	.read_raw = dlh_read_raw,
+};
+
+static const struct iio_chan_spec dlh_channels[] = {
+	{
+		.type = IIO_PRESSURE,
+		.indexed = 1,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type =
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_OFFSET),
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = DLH_NUM_PR_BITS,
+			.storagebits = 32,
+			.shift = 8,
+			.endianness = IIO_BE,
+		},
+	}, {
+		.type = IIO_TEMP,
+		.indexed = 1,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type =
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_OFFSET),
+		.scan_index = 1,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = DLH_NUM_TEMP_BITS,
+			.storagebits = 32,
+			.shift = 8,
+			.endianness = IIO_BE,
+		},
+	}
+};
+
+static irqreturn_t dlh_trigger_handler(int irq, void *private)
+{
+	struct iio_poll_func *pf = private;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct dlh_state *st = iio_priv(indio_dev);
+	int ret;
+	unsigned int chn, i = 0;
+	__be32 tmp_buf[2];
+
+	ret = dlh_start_capture_and_read(st);
+	if (ret)
+		goto out;
+
+	for_each_set_bit(chn, indio_dev->active_scan_mask,
+		indio_dev->masklength) {
+		memcpy(tmp_buf + i,
+			&st->rx_buf[1] + chn * DLH_NUM_DATA_BYTES,
+			DLH_NUM_DATA_BYTES);
+		i++;
+	}
+
+	iio_push_to_buffers(indio_dev, tmp_buf);
+
+out:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t dlh_interrupt(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct dlh_state *st = iio_priv(indio_dev);
+
+	complete(&st->completion);
+
+	return IRQ_HANDLED;
+};
+
+static int dlh_probe(struct i2c_client *client,
+	const struct i2c_device_id *id)
+{
+	struct dlh_state *st;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter,
+		I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE)) {
+		dev_err(&client->dev,
+			"adapter doesn't support required i2c functionality\n");
+		return -EOPNOTSUPP;
+	}
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
+	if (!indio_dev) {
+		dev_err(&client->dev, "failed to allocate iio device\n");
+		return -ENOMEM;
+	}
+
+	i2c_set_clientdata(client, indio_dev);
+
+	st = iio_priv(indio_dev);
+	st->info = dlh_info_tbl[id->driver_data];
+	st->client = client;
+	st->use_interrupt = false;
+
+	indio_dev->name = id->name;
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->dev.of_node = client->dev.of_node;
+	indio_dev->info = &dlh_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels =  dlh_channels;
+	indio_dev->num_channels = ARRAY_SIZE(dlh_channels);
+
+	if (client->irq > 0) {
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+			dlh_interrupt, NULL,
+			IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+			id->name, indio_dev);
+		if (ret) {
+			dev_err(&client->dev, "failed to allocate threaded irq");
+			return ret;
+		}
+
+		st->use_interrupt = true;
+		init_completion(&st->completion);
+	}
+
+	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
+		NULL, &dlh_trigger_handler, NULL);
+	if (ret) {
+		dev_err(&client->dev, "failed to setup iio buffer\n");
+		return ret;
+	}
+
+	ret = devm_iio_device_register(&client->dev, indio_dev);
+	if (ret)
+		dev_err(&client->dev, "failed to register iio device\n");
+
+	return ret;
+}
+
+static const struct of_device_id dlh_of_match[] = {
+	{ .compatible = "asc,dlhl60d" },
+	{ .compatible = "asc,dlhl60g" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, dlh_of_match);
+
+static const struct i2c_device_id dlh_id[] = {
+	{ "dlhl60d",    dlhl60d },
+	{ "dlhl60g",    dlhl60g },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, dlh_id);
+
+static struct i2c_driver dlh_driver = {
+	.driver = {
+		.name = "dlhl60d",
+		.of_match_table = dlh_of_match,
+	},
+	.probe = dlh_probe,
+	.id_table = dlh_id,
+};
+module_i2c_driver(dlh_driver);
+
+MODULE_AUTHOR("Tomislav Denis <tomislav.denis@avl.com>");
+MODULE_DESCRIPTION("Driver for All Sensors DLH series pressure sensors");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/pressure/st_pressure.h b/drivers/iio/pressure/st_pressure.h
index c2e47a6c3118..5c746ff6087e 100644
--- a/drivers/iio/pressure/st_pressure.h
+++ b/drivers/iio/pressure/st_pressure.h
@@ -37,7 +37,7 @@ enum st_press_type {
  * struct st_sensors_platform_data - default press platform data
  * @drdy_int_pin: default press DRDY is available on INT1 pin.
  */
-static const struct st_sensors_platform_data default_press_pdata = {
+static __maybe_unused const struct st_sensors_platform_data default_press_pdata = {
 	.drdy_int_pin = 1,
 };
 
diff --git a/drivers/iio/pressure/st_pressure_i2c.c b/drivers/iio/pressure/st_pressure_i2c.c
index 71d2ed6b4948..6203bc9d5c2d 100644
--- a/drivers/iio/pressure/st_pressure_i2c.c
+++ b/drivers/iio/pressure/st_pressure_i2c.c
@@ -61,8 +61,6 @@ static const struct acpi_device_id st_press_acpi_match[] = {
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, st_press_acpi_match);
-#else
-#define st_press_acpi_match NULL
 #endif
 
 static const struct i2c_device_id st_press_id_table[] = {
diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index d53601447da4..37606d400805 100644
--- a/drivers/iio/proximity/Kconfig
+++ b/drivers/iio/proximity/Kconfig
@@ -58,6 +58,21 @@ config MB1232
 	  To compile this driver as a module, choose M here: the
 	  module will be called mb1232.
 
+config PING
+	tristate "Parallax GPIO bitbanged ranger sensors"
+	depends on GPIOLIB
+	help
+	  Say Y here to build a driver for GPIO bitbanged ranger sensors
+	  with just one GPIO for the trigger and echo. This driver can be
+	  used to measure the distance of objects.
+
+	  Actually supported are:
+	  - Parallax PING))) (ultrasonic)
+	  - Parallax LaserPING (time-of-flight)
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ping.
+
 config RFD77402
 	tristate "RFD77402 ToF sensor"
 	depends on I2C
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
index 0bb5f9de13d6..c591b019304e 100644
--- a/drivers/iio/proximity/Makefile
+++ b/drivers/iio/proximity/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_AS3935)		+= as3935.o
 obj-$(CONFIG_ISL29501)		+= isl29501.o
 obj-$(CONFIG_LIDAR_LITE_V2)	+= pulsedlight-lidar-lite-v2.o
 obj-$(CONFIG_MB1232)		+= mb1232.o
+obj-$(CONFIG_PING)		+= ping.o
 obj-$(CONFIG_RFD77402)		+= rfd77402.o
 obj-$(CONFIG_SRF04)		+= srf04.o
 obj-$(CONFIG_SRF08)		+= srf08.o
diff --git a/drivers/iio/proximity/as3935.c b/drivers/iio/proximity/as3935.c
index b591c63bd6c4..bac9a433dd19 100644
--- a/drivers/iio/proximity/as3935.c
+++ b/drivers/iio/proximity/as3935.c
@@ -14,7 +14,6 @@
 #include <linux/mutex.h>
 #include <linux/err.h>
 #include <linux/irq.h>
-#include <linux/gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -22,8 +21,6 @@
 #include <linux/iio/trigger_consumer.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/triggered_buffer.h>
-#include <linux/of_gpio.h>
-
 
 #define AS3935_AFE_GAIN		0x00
 #define AS3935_AFE_MASK		0x3F
diff --git a/drivers/iio/proximity/ping.c b/drivers/iio/proximity/ping.c
new file mode 100644
index 000000000000..34aff108dff5
--- /dev/null
+++ b/drivers/iio/proximity/ping.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PING: ultrasonic sensor for distance measuring by using only one GPIOs
+ *
+ * Copyright (c) 2019 Andreas Klinger <ak@it-klinger.de>
+ *
+ * For details about the devices see:
+ * http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
+ * http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
+ *
+ * the measurement cycle as timing diagram looks like:
+ *
+ * GPIO      ___              ________________________
+ * ping:  __/   \____________/                        \________________
+ *          ^   ^            ^                        ^
+ *          |<->|            interrupt                interrupt
+ *         udelay(5)         (ts_rising)              (ts_falling)
+ *                           |<---------------------->|
+ *                           .  pulse time measured   .
+ *                           .  --> one round trip of ultra sonic waves
+ * ultra                     .                        .
+ * sonic            _   _   _.                        .
+ * burst: _________/ \_/ \_/ \_________________________________________
+ *                                                    .
+ * ultra                                              .
+ * sonic                                     _   _   _.
+ * echo:  __________________________________/ \_/ \_/ \________________
+ */
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+struct ping_cfg {
+	unsigned long	trigger_pulse_us;	/* length of trigger pulse */
+	int		laserping_error;	/* support error code in */
+						/*   pulse width of laser */
+						/*   ping sensors */
+	s64		timeout_ns;		/* timeout in ns */
+};
+
+struct ping_data {
+	struct device		*dev;
+	struct gpio_desc	*gpiod_ping;
+	struct mutex		lock;
+	int			irqnr;
+	ktime_t			ts_rising;
+	ktime_t			ts_falling;
+	struct completion	rising;
+	struct completion	falling;
+	const struct ping_cfg	*cfg;
+};
+
+static const struct ping_cfg pa_ping_cfg = {
+	.trigger_pulse_us	= 5,
+	.laserping_error	= 0,
+	.timeout_ns		= 18500000,	/* 3 meters */
+};
+
+static const struct ping_cfg pa_laser_ping_cfg = {
+	.trigger_pulse_us	= 5,
+	.laserping_error	= 1,
+	.timeout_ns		= 15500000,	/* 2 meters plus error codes */
+};
+
+static irqreturn_t ping_handle_irq(int irq, void *dev_id)
+{
+	struct iio_dev *indio_dev = dev_id;
+	struct ping_data *data = iio_priv(indio_dev);
+	ktime_t now = ktime_get();
+
+	if (gpiod_get_value(data->gpiod_ping)) {
+		data->ts_rising = now;
+		complete(&data->rising);
+	} else {
+		data->ts_falling = now;
+		complete(&data->falling);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int ping_read(struct ping_data *data)
+{
+	int ret;
+	ktime_t ktime_dt;
+	s64 dt_ns;
+	u32 time_ns, distance_mm;
+	struct platform_device *pdev = to_platform_device(data->dev);
+	struct iio_dev *indio_dev = iio_priv_to_dev(data);
+
+	/*
+	 * just one read-echo-cycle can take place at a time
+	 * ==> lock against concurrent reading calls
+	 */
+	mutex_lock(&data->lock);
+
+	reinit_completion(&data->rising);
+	reinit_completion(&data->falling);
+
+	gpiod_set_value(data->gpiod_ping, 1);
+	udelay(data->cfg->trigger_pulse_us);
+	gpiod_set_value(data->gpiod_ping, 0);
+
+	ret = gpiod_direction_input(data->gpiod_ping);
+	if (ret < 0) {
+		mutex_unlock(&data->lock);
+		return ret;
+	}
+
+	data->irqnr = gpiod_to_irq(data->gpiod_ping);
+	if (data->irqnr < 0) {
+		dev_err(data->dev, "gpiod_to_irq: %d\n", data->irqnr);
+		mutex_unlock(&data->lock);
+		return data->irqnr;
+	}
+
+	ret = request_irq(data->irqnr, ping_handle_irq,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+							pdev->name, indio_dev);
+	if (ret < 0) {
+		dev_err(data->dev, "request_irq: %d\n", ret);
+		mutex_unlock(&data->lock);
+		return ret;
+	}
+
+	/* it should not take more than 20 ms until echo is rising */
+	ret = wait_for_completion_killable_timeout(&data->rising, HZ/50);
+	if (ret < 0)
+		goto err_reset_direction;
+	else if (ret == 0) {
+		ret = -ETIMEDOUT;
+		goto err_reset_direction;
+	}
+
+	/* it cannot take more than 50 ms until echo is falling */
+	ret = wait_for_completion_killable_timeout(&data->falling, HZ/20);
+	if (ret < 0)
+		goto err_reset_direction;
+	else if (ret == 0) {
+		ret = -ETIMEDOUT;
+		goto err_reset_direction;
+	}
+
+	ktime_dt = ktime_sub(data->ts_falling, data->ts_rising);
+
+	free_irq(data->irqnr, indio_dev);
+
+	ret = gpiod_direction_output(data->gpiod_ping, GPIOD_OUT_LOW);
+	if (ret < 0) {
+		mutex_unlock(&data->lock);
+		return ret;
+	}
+
+	mutex_unlock(&data->lock);
+
+	dt_ns = ktime_to_ns(ktime_dt);
+	if (dt_ns > data->cfg->timeout_ns) {
+		dev_dbg(data->dev, "distance out of range: dt=%lldns\n",
+								dt_ns);
+		return -EIO;
+	}
+
+	time_ns = dt_ns;
+
+	/*
+	 * read error code of laser ping sensor and give users chance to
+	 * figure out error by using dynamic debuggging
+	 */
+	if (data->cfg->laserping_error) {
+		if ((time_ns > 12500000) && (time_ns <= 13500000)) {
+			dev_dbg(data->dev, "target too close or to far\n");
+			return -EIO;
+		}
+		if ((time_ns > 13500000) && (time_ns <= 14500000)) {
+			dev_dbg(data->dev, "internal sensor error\n");
+			return -EIO;
+		}
+		if ((time_ns > 14500000) && (time_ns <= 15500000)) {
+			dev_dbg(data->dev, "internal sensor timeout\n");
+			return -EIO;
+		}
+	}
+
+	/*
+	 * the speed as function of the temperature is approximately:
+	 *
+	 * speed = 331,5 + 0,6 * Temp
+	 *   with Temp in °C
+	 *   and speed in m/s
+	 *
+	 * use 343,5 m/s as ultrasonic speed at 20 °C here in absence of the
+	 * temperature
+	 *
+	 * therefore:
+	 *             time     343,5     time * 232
+	 * distance = ------ * ------- = ------------
+	 *             10^6         2        1350800
+	 *   with time in ns
+	 *   and distance in mm (one way)
+	 *
+	 * because we limit to 3 meters the multiplication with 232 just
+	 * fits into 32 bit
+	 */
+	distance_mm = time_ns * 232 / 1350800;
+
+	return distance_mm;
+
+err_reset_direction:
+	free_irq(data->irqnr, indio_dev);
+	mutex_unlock(&data->lock);
+
+	if (gpiod_direction_output(data->gpiod_ping, GPIOD_OUT_LOW))
+		dev_dbg(data->dev, "error in gpiod_direction_output\n");
+	return ret;
+}
+
+static int ping_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *channel, int *val,
+			    int *val2, long info)
+{
+	struct ping_data *data = iio_priv(indio_dev);
+	int ret;
+
+	if (channel->type != IIO_DISTANCE)
+		return -EINVAL;
+
+	switch (info) {
+	case IIO_CHAN_INFO_RAW:
+		ret = ping_read(data);
+		if (ret < 0)
+			return ret;
+		*val = ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		/*
+		 * maximum resolution in datasheet is 1 mm
+		 * 1 LSB is 1 mm
+		 */
+		*val = 0;
+		*val2 = 1000;
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info ping_iio_info = {
+	.read_raw		= ping_read_raw,
+};
+
+static const struct iio_chan_spec ping_chan_spec[] = {
+	{
+		.type = IIO_DISTANCE,
+		.info_mask_separate =
+				BIT(IIO_CHAN_INFO_RAW) |
+				BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+static const struct of_device_id of_ping_match[] = {
+	{ .compatible = "parallax,ping", .data = &pa_ping_cfg},
+	{ .compatible = "parallax,laserping", .data = &pa_ping_cfg},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_ping_match);
+
+static int ping_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ping_data *data;
+	struct iio_dev *indio_dev;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(struct ping_data));
+	if (!indio_dev) {
+		dev_err(dev, "failed to allocate IIO device\n");
+		return -ENOMEM;
+	}
+
+	data = iio_priv(indio_dev);
+	data->dev = dev;
+	data->cfg = of_device_get_match_data(dev);
+
+	mutex_init(&data->lock);
+	init_completion(&data->rising);
+	init_completion(&data->falling);
+
+	data->gpiod_ping = devm_gpiod_get(dev, "ping", GPIOD_OUT_LOW);
+	if (IS_ERR(data->gpiod_ping)) {
+		dev_err(dev, "failed to get ping-gpios: err=%ld\n",
+						PTR_ERR(data->gpiod_ping));
+		return PTR_ERR(data->gpiod_ping);
+	}
+
+	if (gpiod_cansleep(data->gpiod_ping)) {
+		dev_err(data->dev, "cansleep-GPIOs not supported\n");
+		return -ENODEV;
+	}
+
+	platform_set_drvdata(pdev, indio_dev);
+
+	indio_dev->name = "ping";
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->info = &ping_iio_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = ping_chan_spec;
+	indio_dev->num_channels = ARRAY_SIZE(ping_chan_spec);
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static struct platform_driver ping_driver = {
+	.probe		= ping_probe,
+	.driver		= {
+		.name		= "ping-gpio",
+		.of_match_table	= of_ping_match,
+	},
+};
+
+module_platform_driver(ping_driver);
+
+MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");
+MODULE_DESCRIPTION("PING sensors for distance measuring using one GPIOs");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ping");
diff --git a/drivers/iio/resolver/ad2s1200.c b/drivers/iio/resolver/ad2s1200.c
index 17b89623418c..a391f46ee06b 100644
--- a/drivers/iio/resolver/ad2s1200.c
+++ b/drivers/iio/resolver/ad2s1200.c
@@ -10,7 +10,6 @@
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/device.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
diff --git a/drivers/iio/temperature/max31856.c b/drivers/iio/temperature/max31856.c
index 73ed550e3fc9..b4cb21ab2e85 100644
--- a/drivers/iio/temperature/max31856.c
+++ b/drivers/iio/temperature/max31856.c
@@ -6,12 +6,14 @@
  * Copyright (C) 2018-2019 Rockwell Collins
  */
 
+#include <linux/ctype.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/spi/spi.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
+#include <linux/util_macros.h>
 #include <dt-bindings/iio/temperature/thermocouple.h>
 /*
  * The MSB of the register value determines whether the following byte will
@@ -23,6 +25,9 @@
 #define MAX31856_CR0_1SHOT         BIT(6)
 #define MAX31856_CR0_OCFAULT       BIT(4)
 #define MAX31856_CR0_OCFAULT_MASK  GENMASK(5, 4)
+#define MAX31856_CR0_FILTER_50HZ   BIT(0)
+#define MAX31856_AVERAGING_MASK    GENMASK(6, 4)
+#define MAX31856_AVERAGING_SHIFT   4
 #define MAX31856_TC_TYPE_MASK      GENMASK(3, 0)
 #define MAX31856_FAULT_OVUV        BIT(1)
 #define MAX31856_FAULT_OPEN        BIT(0)
@@ -49,7 +54,10 @@ static const struct iio_chan_spec max31856_channels[] = {
 	{	/* Thermocouple Temperature */
 		.type = IIO_TEMP,
 		.info_mask_separate =
-			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE),
+		.info_mask_shared_by_type =
+			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO)
 	},
 	{	/* Cold Junction Temperature */
 		.type = IIO_TEMP,
@@ -57,12 +65,20 @@ static const struct iio_chan_spec max31856_channels[] = {
 		.modified = 1,
 		.info_mask_separate =
 			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_type =
+			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO)
 	},
 };
 
 struct max31856_data {
 	struct spi_device *spi;
 	u32 thermocouple_type;
+	bool filter_50hz;
+	int averaging;
+};
+
+static const char max31856_tc_types[] = {
+	'B', 'E', 'J', 'K', 'N', 'R', 'S', 'T'
 };
 
 static int max31856_read(struct max31856_data *data, u8 reg,
@@ -107,6 +123,10 @@ static int max31856_init(struct max31856_data *data)
 
 	reg_cr1_val &= ~MAX31856_TC_TYPE_MASK;
 	reg_cr1_val |= data->thermocouple_type;
+
+	reg_cr1_val &= ~MAX31856_AVERAGING_MASK;
+	reg_cr1_val |= data->averaging << MAX31856_AVERAGING_SHIFT;
+
 	ret = max31856_write(data, MAX31856_CR1_REG, reg_cr1_val);
 	if (ret)
 		return ret;
@@ -123,6 +143,11 @@ static int max31856_init(struct max31856_data *data)
 	reg_cr0_val &= ~MAX31856_CR0_1SHOT;
 	reg_cr0_val |= MAX31856_CR0_AUTOCONVERT;
 
+	if (data->filter_50hz)
+		reg_cr0_val |= MAX31856_CR0_FILTER_50HZ;
+	else
+		reg_cr0_val &= ~MAX31856_CR0_FILTER_50HZ;
+
 	return max31856_write(data, MAX31856_CR0_REG, reg_cr0_val);
 }
 
@@ -210,6 +235,12 @@ static int max31856_read_raw(struct iio_dev *indio_dev,
 			return IIO_VAL_INT_PLUS_MICRO;
 		}
 		break;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		*val = 1 << data->averaging;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+		*val = max31856_tc_types[data->thermocouple_type];
+		return IIO_VAL_CHAR;
 	default:
 		ret = -EINVAL;
 		break;
@@ -218,6 +249,62 @@ static int max31856_read_raw(struct iio_dev *indio_dev,
 	return ret;
 }
 
+static int max31856_write_raw_get_fmt(struct iio_dev *indio_dev,
+				      struct iio_chan_spec const *chan,
+				      long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+		return IIO_VAL_CHAR;
+	default:
+		return IIO_VAL_INT;
+	}
+}
+
+static int max31856_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int val, int val2, long mask)
+{
+	struct max31856_data *data = iio_priv(indio_dev);
+	int msb;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		if (val > 16 || val < 1)
+			return -EINVAL;
+		msb = fls(val) - 1;
+		/* Round up to next 2pow if needed */
+		if (BIT(msb) < val)
+			msb++;
+
+		data->averaging = msb;
+		max31856_init(data);
+		break;
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+	{
+		int tc_type = -1;
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(max31856_tc_types); i++) {
+			if (max31856_tc_types[i] == toupper(val)) {
+				tc_type = i;
+				break;
+			}
+		}
+		if (tc_type < 0)
+			return -EINVAL;
+
+		data->thermocouple_type = tc_type;
+		max31856_init(data);
+		break;
+	}
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static ssize_t show_fault(struct device *dev, u8 faultbit, char *buf)
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
@@ -249,12 +336,54 @@ static ssize_t show_fault_oc(struct device *dev,
 	return show_fault(dev, MAX31856_FAULT_OPEN, buf);
 }
 
+static ssize_t show_filter(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31856_data *data = iio_priv(indio_dev);
+
+	return sprintf(buf, "%d\n", data->filter_50hz ? 50 : 60);
+}
+
+static ssize_t set_filter(struct device *dev,
+			  struct device_attribute *attr,
+			  const char *buf,
+			  size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31856_data *data = iio_priv(indio_dev);
+	unsigned int freq;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &freq);
+	if (ret)
+		return ret;
+
+	switch (freq) {
+	case 50:
+		data->filter_50hz = true;
+		break;
+	case 60:
+		data->filter_50hz = false;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	max31856_init(data);
+	return len;
+}
+
 static IIO_DEVICE_ATTR(fault_ovuv, 0444, show_fault_ovuv, NULL, 0);
 static IIO_DEVICE_ATTR(fault_oc, 0444, show_fault_oc, NULL, 0);
+static IIO_DEVICE_ATTR(in_temp_filter_notch_center_frequency, 0644,
+		       show_filter, set_filter, 0);
 
 static struct attribute *max31856_attributes[] = {
 	&iio_dev_attr_fault_ovuv.dev_attr.attr,
 	&iio_dev_attr_fault_oc.dev_attr.attr,
+	&iio_dev_attr_in_temp_filter_notch_center_frequency.dev_attr.attr,
 	NULL,
 };
 
@@ -264,6 +393,8 @@ static const struct attribute_group max31856_group = {
 
 static const struct iio_info max31856_info = {
 	.read_raw = max31856_read_raw,
+	.write_raw = max31856_write_raw,
+	.write_raw_get_fmt = max31856_write_raw_get_fmt,
 	.attrs = &max31856_group,
 };
 
@@ -280,6 +411,7 @@ static int max31856_probe(struct spi_device *spi)
 
 	data = iio_priv(indio_dev);
 	data->spi = spi;
+	data->filter_50hz = false;
 
 	spi_set_drvdata(spi, indio_dev);
 
diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c
index d1360605209c..8d21116c7a22 100644
--- a/drivers/iio/temperature/maxim_thermocouple.c
+++ b/drivers/iio/temperature/maxim_thermocouple.c
@@ -14,6 +14,7 @@
 #include <linux/of_device.h>
 #include <linux/spi/spi.h>
 #include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
 #include <linux/iio/trigger.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/triggered_buffer.h>
@@ -24,13 +25,25 @@
 enum {
 	MAX6675,
 	MAX31855,
+	MAX31855K,
+	MAX31855J,
+	MAX31855N,
+	MAX31855S,
+	MAX31855T,
+	MAX31855E,
+	MAX31855R,
+};
+
+static const char maxim_tc_types[] = {
+	'K', '?', 'K', 'J', 'N', 'S', 'T', 'E', 'R'
 };
 
 static const struct iio_chan_spec max6675_channels[] = {
 	{	/* thermocouple temperature */
 		.type = IIO_TEMP,
 		.info_mask_separate =
-			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE),
 		.scan_index = 0,
 		.scan_type = {
 			.sign = 's',
@@ -48,7 +61,8 @@ static const struct iio_chan_spec max31855_channels[] = {
 		.type = IIO_TEMP,
 		.address = 2,
 		.info_mask_separate =
-			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE),
 		.scan_index = 0,
 		.scan_type = {
 			.sign = 's',
@@ -110,6 +124,7 @@ struct maxim_thermocouple_data {
 	const struct maxim_thermocouple_chip *chip;
 
 	u8 buffer[16] ____cacheline_aligned;
+	char tc_type;
 };
 
 static int maxim_thermocouple_read(struct maxim_thermocouple_data *data,
@@ -196,6 +211,10 @@ static int maxim_thermocouple_read_raw(struct iio_dev *indio_dev,
 			ret = IIO_VAL_INT;
 		}
 		break;
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+		*val = data->tc_type;
+		ret = IIO_VAL_CHAR;
+		break;
 	}
 
 	return ret;
@@ -210,8 +229,9 @@ static int maxim_thermocouple_probe(struct spi_device *spi)
 	const struct spi_device_id *id = spi_get_device_id(spi);
 	struct iio_dev *indio_dev;
 	struct maxim_thermocouple_data *data;
+	const int chip_type = (id->driver_data == MAX6675) ? MAX6675 : MAX31855;
 	const struct maxim_thermocouple_chip *chip =
-			&maxim_thermocouple_chips[id->driver_data];
+		&maxim_thermocouple_chips[chip_type];
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
@@ -229,6 +249,7 @@ static int maxim_thermocouple_probe(struct spi_device *spi)
 	data = iio_priv(indio_dev);
 	data->spi = spi;
 	data->chip = chip;
+	data->tc_type = maxim_tc_types[id->driver_data];
 
 	ret = devm_iio_triggered_buffer_setup(&spi->dev,
 				indio_dev, NULL,
@@ -236,12 +257,22 @@ static int maxim_thermocouple_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
+	if (id->driver_data == MAX31855)
+		dev_warn(&spi->dev, "generic max31855 ID is deprecated\nplease use more specific part type");
+
 	return devm_iio_device_register(&spi->dev, indio_dev);
 }
 
 static const struct spi_device_id maxim_thermocouple_id[] = {
 	{"max6675", MAX6675},
 	{"max31855", MAX31855},
+	{"max31855k", MAX31855K},
+	{"max31855j", MAX31855J},
+	{"max31855n", MAX31855N},
+	{"max31855s", MAX31855S},
+	{"max31855t", MAX31855T},
+	{"max31855e", MAX31855E},
+	{"max31855r", MAX31855R},
 	{},
 };
 MODULE_DEVICE_TABLE(spi, maxim_thermocouple_id);
@@ -249,6 +280,13 @@ MODULE_DEVICE_TABLE(spi, maxim_thermocouple_id);
 static const struct of_device_id maxim_thermocouple_of_match[] = {
         { .compatible = "maxim,max6675" },
         { .compatible = "maxim,max31855" },
+	{ .compatible = "maxim,max31855k" },
+	{ .compatible = "maxim,max31855j" },
+	{ .compatible = "maxim,max31855n" },
+	{ .compatible = "maxim,max31855s" },
+	{ .compatible = "maxim,max31855t" },
+	{ .compatible = "maxim,max31855e" },
+	{ .compatible = "maxim,max31855r" },
         { },
 };
 MODULE_DEVICE_TABLE(of, maxim_thermocouple_of_match);
diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
index a5dfe65cd9b9..2e0d32aa8436 100644
--- a/drivers/iio/trigger/stm32-timer-trigger.c
+++ b/drivers/iio/trigger/stm32-timer-trigger.c
@@ -297,9 +297,6 @@ static ssize_t stm32_tt_store_master_mode(struct device *dev,
 			     strlen(master_mode_table[i]))) {
 			regmap_update_bits(priv->regmap, TIM_CR2, mask,
 					   i << shift);
-			/* Make sure that registers are updated */
-			regmap_update_bits(priv->regmap, TIM_EGR,
-					   TIM_EGR_UG, TIM_EGR_UG);
 			return len;
 		}
 	}