Merge tag 'reset-for-v6.15' of git://git.pengutronix.de/pza/linux into soc/drivers

Reset controller updates for v6.15

* Add missing microchip,sam9x7-rstc compatible to device tree binding
  documentation.
* Add SCU reset driver for i.MX8QXP and i.MX8QM.

* tag 'reset-for-v6.15' of git://git.pengutronix.de/pza/linux:
  reset: imx: fix incorrect module device table
  reset: imx: Add SCU reset driver for i.MX8QXP and i.MX8QM
  dt-bindings: firmware: imx: add property reset-controller
  dt-bindings: reset: atmel,at91sam9260-reset: add sam9x7

Link: https://lore.kernel.org/r/20250314164406.744117-1-p.zabel@pengutronix.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

5 files changed, 125 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
index 557e524786c2..f9ba18f06369 100644
--- a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
+++ b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
@@ -45,6 +45,18 @@ properties:
       Keys provided by the SCU
     $ref: /schemas/input/fsl,scu-key.yaml
 
+  reset-controller:
+    type: object
+    properties:
+      compatible:
+        const: fsl,imx-scu-reset
+      '#reset-cells':
+        const: 1
+    required:
+      - compatible
+      - '#reset-cells'
+    additionalProperties: false
+
   mboxes:
     description:
       A list of phandles of TX MU channels followed by a list of phandles of
diff --git a/Documentation/devicetree/bindings/reset/atmel,at91sam9260-reset.yaml b/Documentation/devicetree/bindings/reset/atmel,at91sam9260-reset.yaml
index 98465d26949e..c3b33bbc7319 100644
--- a/Documentation/devicetree/bindings/reset/atmel,at91sam9260-reset.yaml
+++ b/Documentation/devicetree/bindings/reset/atmel,at91sam9260-reset.yaml
@@ -26,6 +26,10 @@ properties:
       - items:
           - const: atmel,sama5d3-rstc
           - const: atmel,at91sam9g45-rstc
+      - items:
+          - enum:
+              - microchip,sam9x7-rstc
+          - const: microchip,sam9x60-rstc
 
   reg:
     minItems: 1
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 5b3abb6db248..99f6f9784e68 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -96,6 +96,13 @@ config RESET_HSDK
 	help
 	  This enables the reset controller driver for HSDK board.
 
+config RESET_IMX_SCU
+	tristate "i.MX8Q Reset Driver"
+	depends on IMX_SCU && HAVE_ARM_SMCCC
+	depends on (ARM64 && ARCH_MXC) || COMPILE_TEST
+	help
+          This enables the reset controller driver for i.MX8QM/i.MX8QXP
+
 config RESET_IMX7
 	tristate "i.MX7/8 Reset Driver"
 	depends on HAS_IOMEM
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 677c4d1e2632..31f9904d13f9 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o
 obj-$(CONFIG_RESET_EYEQ) += reset-eyeq.o
 obj-$(CONFIG_RESET_GPIO) += reset-gpio.o
 obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
+obj-$(CONFIG_RESET_IMX_SCU) += reset-imx-scu.o
 obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
 obj-$(CONFIG_RESET_IMX8MP_AUDIOMIX) += reset-imx8mp-audiomix.o
 obj-$(CONFIG_RESET_INTEL_GW) += reset-intel-gw.o
diff --git a/drivers/reset/reset-imx-scu.c b/drivers/reset/reset-imx-scu.c
new file mode 100644
index 000000000000..919fc29f944c
--- /dev/null
+++ b/drivers/reset/reset-imx-scu.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2025 NXP
+ * Frank Li <Frank.Li@nxp.com>
+ */
+#include <linux/firmware/imx/svc/misc.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+
+struct imx_scu_reset {
+	struct reset_controller_dev rc;
+	struct imx_sc_ipc *ipc_handle;
+};
+
+static struct imx_scu_reset *to_imx_scu(struct reset_controller_dev *rc)
+{
+	return container_of(rc, struct imx_scu_reset, rc);
+}
+
+struct imx_scu_id_map {
+	u32 resource_id;
+	u32 command_id;
+};
+
+static const struct imx_scu_id_map imx_scu_id_map[] = {
+	{ IMX_SC_R_CSI_0, IMX_SC_C_MIPI_RESET },
+	{ IMX_SC_R_CSI_1, IMX_SC_C_MIPI_RESET },
+};
+
+static int imx_scu_reset_assert(struct reset_controller_dev *rc, unsigned long id)
+{
+	struct imx_scu_reset *priv = to_imx_scu(rc);
+
+	return imx_sc_misc_set_control(priv->ipc_handle, imx_scu_id_map[id].resource_id,
+				       imx_scu_id_map[id].command_id, true);
+}
+
+static const struct reset_control_ops imx_scu_reset_ops = {
+	.assert = imx_scu_reset_assert,
+};
+
+static int imx_scu_xlate(struct reset_controller_dev *rc, const struct of_phandle_args *reset_spec)
+{
+	int i;
+
+	for (i = 0; i < rc->nr_resets; i++)
+		if (reset_spec->args[0] == imx_scu_id_map[i].resource_id)
+			return i;
+
+	return -EINVAL;
+}
+
+static int imx_scu_reset_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct imx_scu_reset *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, &priv->rc);
+
+	ret = imx_scu_get_handle(&priv->ipc_handle);
+	if (ret)
+		return dev_err_probe(dev, ret, "sc_misc_MIPI get ipc handle failed!\n");
+
+	priv->rc.ops = &imx_scu_reset_ops;
+	priv->rc.owner = THIS_MODULE;
+	priv->rc.of_node = dev->of_node;
+	priv->rc.of_reset_n_cells = 1;
+	priv->rc.of_xlate = imx_scu_xlate;
+	priv->rc.nr_resets = ARRAY_SIZE(imx_scu_id_map);
+
+	return devm_reset_controller_register(dev, &priv->rc);
+}
+
+static const struct of_device_id imx_scu_reset_ids[] = {
+	{ .compatible = "fsl,imx-scu-reset", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, imx_scu_reset_ids);
+
+static struct platform_driver imx_scu_reset_driver = {
+	.probe          = imx_scu_reset_probe,
+	.driver = {
+		.name = "scu-reset",
+		.of_match_table = imx_scu_reset_ids,
+	},
+};
+module_platform_driver(imx_scu_reset_driver);
+
+MODULE_AUTHOR("Frank Li <Frank.Li@nxp.com>");
+MODULE_DESCRIPTION("i.MX scu reset driver");
+MODULE_LICENSE("GPL");