tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright 2025 NXP
4 * Frank Li <Frank.Li@nxp.com>
5 */
6#include <linux/firmware/imx/svc/misc.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/of.h>
10#include <linux/platform_device.h>
11#include <linux/reset-controller.h>
12
13#include <dt-bindings/firmware/imx/rsrc.h>
14
15struct imx_scu_reset {
16 struct reset_controller_dev rc;
17 struct imx_sc_ipc *ipc_handle;
18};
19
20static struct imx_scu_reset *to_imx_scu(struct reset_controller_dev *rc)
21{
22 return container_of(rc, struct imx_scu_reset, rc);
23}
24
25struct imx_scu_id_map {
26 u32 resource_id;
27 u32 command_id;
28};
29
30static const struct imx_scu_id_map imx_scu_id_map[] = {
31 { IMX_SC_R_CSI_0, IMX_SC_C_MIPI_RESET },
32 { IMX_SC_R_CSI_1, IMX_SC_C_MIPI_RESET },
33};
34
35static int imx_scu_reset_assert(struct reset_controller_dev *rc, unsigned long id)
36{
37 struct imx_scu_reset *priv = to_imx_scu(rc);
38
39 return imx_sc_misc_set_control(priv->ipc_handle, imx_scu_id_map[id].resource_id,
40 imx_scu_id_map[id].command_id, true);
41}
42
43static const struct reset_control_ops imx_scu_reset_ops = {
44 .assert = imx_scu_reset_assert,
45};
46
47static int imx_scu_xlate(struct reset_controller_dev *rc, const struct of_phandle_args *reset_spec)
48{
49 int i;
50
51 for (i = 0; i < rc->nr_resets; i++)
52 if (reset_spec->args[0] == imx_scu_id_map[i].resource_id)
53 return i;
54
55 return -EINVAL;
56}
57
58static int imx_scu_reset_probe(struct platform_device *pdev)
59{
60 struct device *dev = &pdev->dev;
61 struct imx_scu_reset *priv;
62 int ret;
63
64 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
65 if (!priv)
66 return -ENOMEM;
67
68 platform_set_drvdata(pdev, &priv->rc);
69
70 ret = imx_scu_get_handle(&priv->ipc_handle);
71 if (ret)
72 return dev_err_probe(dev, ret, "sc_misc_MIPI get ipc handle failed!\n");
73
74 priv->rc.ops = &imx_scu_reset_ops;
75 priv->rc.owner = THIS_MODULE;
76 priv->rc.of_node = dev->of_node;
77 priv->rc.of_reset_n_cells = 1;
78 priv->rc.of_xlate = imx_scu_xlate;
79 priv->rc.nr_resets = ARRAY_SIZE(imx_scu_id_map);
80
81 return devm_reset_controller_register(dev, &priv->rc);
82}
83
84static const struct of_device_id imx_scu_reset_ids[] = {
85 { .compatible = "fsl,imx-scu-reset", },
86 {}
87};
88MODULE_DEVICE_TABLE(of, imx_scu_reset_ids);
89
90static struct platform_driver imx_scu_reset_driver = {
91 .probe = imx_scu_reset_probe,
92 .driver = {
93 .name = "scu-reset",
94 .of_match_table = imx_scu_reset_ids,
95 },
96};
97module_platform_driver(imx_scu_reset_driver);
98
99MODULE_AUTHOR("Frank Li <Frank.Li@nxp.com>");
100MODULE_DESCRIPTION("i.MX scu reset driver");
101MODULE_LICENSE("GPL");