Merge tag 'regulator-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator

Pull regulator updates from Mark Brown:
 "This has been a very busy release for the core, some fixes, one large
  new feature and a big bit of refactoring to update the GPIO API:

   - Support for coupled regulators from Dmitry Osipenko based on a
     prior attempt by Maciej Purski, allowing us to handle situations
     where the voltages on two regulators can't be too far apart from
     each other.

   - Conversion of the GPIO support in both drivers and the core to use
     GPIO descriptors rather than numbers, part of the overall project
     to remove GPIO numbers.

   - Support for standby mode suspend states from Andrei Stefanescu.

   - New drivers for Allwinner AXP209, Cirrus Logic Lochnagar and
     Microchip MPC16502"

* tag 'regulator-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: (90 commits)
  regulator: tps65910: fix a missing check of return value
  regulator: mcp16502: Select REGMAP_I2C to fix build error
  regulator: convert to DEFINE_SHOW_ATTRIBUTE
  regulator: mcp16502: Fix missing n_voltages setting
  regulator: mcp16502: Use #ifdef CONFIG_PM_SLEEP around mcp16502_suspend/resume_noirq
  regulator: mcp16502: code cleanup
  regulator: act8945a-regulator: make symbol act8945a_pm static
  drivers/regulator: fix a missing check of return value
  regulator: act8945a-regulator: fix 'defined but not used' compiler warning
  regulator: axp20x: fix set_ramp_delay for AXP209/dcdc2
  regulator: mcp16502: add support for suspend
  mfd: axp20x: use explicit bit defines
  mfd: axp20x: Clean up included headers
  regulator: dts: enable soft-start and ramp delay for the OLinuXino Lime2
  dt-bindings: mfd: axp20x: Add software based soft_start for AXP209 LDO3
  regulator: axp20x: add software based soft_start for AXP209 LDO3
  dt-bindings: mfd: axp20x: add support for regulator-ramp-delay for AXP209
  regulator: axp20x: add support for set_ramp_delay for AXP209
  mfd: axp20x: name voltage ramping define properly
  regulator: mcp16502: add regulator driver for MCP16502
  ...

3 files changed, 70 insertions, 18 deletions

diff --git a/drivers/gpio/gpiolib-devres.c b/drivers/gpio/gpiolib-devres.c
index 01959369360b..0acc2cc6e868 100644
--- a/drivers/gpio/gpiolib-devres.c
+++ b/drivers/gpio/gpiolib-devres.c
@@ -98,15 +98,28 @@ struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
 	struct gpio_desc **dr;
 	struct gpio_desc *desc;
 
+	desc = gpiod_get_index(dev, con_id, idx, flags);
+	if (IS_ERR(desc))
+		return desc;
+
+	/*
+	 * For non-exclusive GPIO descriptors, check if this descriptor is
+	 * already under resource management by this device.
+	 */
+	if (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
+		struct devres *dres;
+
+		dres = devres_find(dev, devm_gpiod_release,
+				   devm_gpiod_match, &desc);
+		if (dres)
+			return desc;
+	}
+
 	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
 			  GFP_KERNEL);
-	if (!dr)
+	if (!dr) {
+		gpiod_put(desc);
 		return ERR_PTR(-ENOMEM);
-
-	desc = gpiod_get_index(dev, con_id, idx, flags);
-	if (IS_ERR(desc)) {
-		devres_free(dr);
-		return desc;
 	}
 
 	*dr = desc;
@@ -140,15 +153,28 @@ struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev,
 	struct gpio_desc **dr;
 	struct gpio_desc *desc;
 
+	desc = gpiod_get_from_of_node(node, propname, index, dflags, label);
+	if (IS_ERR(desc))
+		return desc;
+
+	/*
+	 * For non-exclusive GPIO descriptors, check if this descriptor is
+	 * already under resource management by this device.
+	 */
+	if (dflags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
+		struct devres *dres;
+
+		dres = devres_find(dev, devm_gpiod_release,
+				   devm_gpiod_match, &desc);
+		if (dres)
+			return desc;
+	}
+
 	dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
 			  GFP_KERNEL);
-	if (!dr)
+	if (!dr) {
+		gpiod_put(desc);
 		return ERR_PTR(-ENOMEM);
-
-	desc = gpiod_get_from_of_node(node, propname, index, dflags, label);
-	if (IS_ERR(desc)) {
-		devres_free(dr);
-		return desc;
 	}
 
 	*dr = desc;
@@ -321,6 +347,36 @@ void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
 EXPORT_SYMBOL(devm_gpiod_put);
 
 /**
+ * devm_gpiod_unhinge - Remove resource management from a gpio descriptor
+ * @dev:	GPIO consumer
+ * @desc:	GPIO descriptor to remove resource management from
+ *
+ * Remove resource management from a GPIO descriptor. This is needed when
+ * you want to hand over lifecycle management of a descriptor to another
+ * mechanism.
+ */
+
+void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc)
+{
+	int ret;
+
+	if (IS_ERR_OR_NULL(desc))
+		return;
+	ret = devres_destroy(dev, devm_gpiod_release,
+			     devm_gpiod_match, &desc);
+	/*
+	 * If the GPIO descriptor is requested as nonexclusive, we
+	 * may call this function several times on the same descriptor
+	 * so it is OK if devres_destroy() returns -ENOENT.
+	 */
+	if (ret == -ENOENT)
+		return;
+	/* Anything else we should warn about */
+	WARN_ON(ret);
+}
+EXPORT_SYMBOL(devm_gpiod_unhinge);
+
+/**
  * devm_gpiod_put_array - Resource-managed gpiod_put_array()
  * @dev:	GPIO consumer
  * @descs:	GPIO descriptor array to dispose of
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a2cbb474901c..985c09ce80fb 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4205,6 +4205,8 @@ struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
 	transitory = flags & OF_GPIO_TRANSITORY;
 
 	ret = gpiod_request(desc, label);
+	if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE))
+		return desc;
 	if (ret)
 		return ERR_PTR(ret);
 
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 087d865286a0..bc57f0dc5953 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -201,12 +201,6 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
 				  struct gpio_array *array_info,
 				  unsigned long *value_bitmap);
 
-/* This is just passed between gpiolib and devres */
-struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
-					 const char *propname, int index,
-					 enum gpiod_flags dflags,
-					 const char *label);
-
 extern struct spinlock gpio_lock;
 extern struct list_head gpio_devices;