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// 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");
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