[PATCH v3 02/12] reset: imx: Add SCU reset driver for i.MX8QXP and i.MX8QM

Frank Li
2025-02-10T20:59:59Z

Add System Controller Firmware(SCU) reset driver for i.MX8QM and i.MX8QXP.
SCU Manage resets for peripherals such as MIPI CSI. Currently, support two
reset sources: IMX_SC_R_CSI_0 and IMX_SC_R_CSI_1.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
change from v1 to v3
- none
---
drivers/reset/Kconfig | 7 +++
drivers/reset/Makefile | 1 +
drivers/reset/reset-imx-scu.c | 101 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 109 insertions(+)

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 5b3abb6db2489..99f6f9784e686 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 677c4d1e26320..31f9904d13f9c 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 0000000000000..d3074eaad4c99
--- /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(platform, 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");

--
2.34.1