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// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic Pin Control Driver for Board-Level Mux Chips
* Copyright 2026 NXP
*/
#include <linux/cleanup.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/mutex.h>
#include <linux/mux/consumer.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.h>
#include "core.h"
#include "pinconf.h"
#include "pinmux.h"
#include "pinctrl-utils.h"
struct mux_pin_function {
struct mux_state *mux_state;
};
struct mux_pinctrl {
struct device *dev;
struct pinctrl_dev *pctl;
/* mutex protect [pinctrl|pinmux]_generic functions */
struct mutex lock;
};
static int
mux_pinmux_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **maps, unsigned int *num_maps)
{
unsigned int num_reserved_maps = 0;
struct mux_pin_function *function;
const char **group_names;
int ret;
function = devm_kzalloc(pctldev->dev, sizeof(*function), GFP_KERNEL);
if (!function)
return -ENOMEM;
group_names = devm_kcalloc(pctldev->dev, 1, sizeof(*group_names), GFP_KERNEL);
if (!group_names)
return -ENOMEM;
function->mux_state = devm_mux_state_get_from_np(pctldev->dev, NULL, np_config);
if (IS_ERR(function->mux_state))
return PTR_ERR(function->mux_state);
ret = pinctrl_generic_to_map(pctldev, np_config, np_config, maps,
num_maps, &num_reserved_maps, group_names,
0, &np_config->name, NULL, 0);
if (ret)
return ret;
ret = pinmux_generic_add_function(pctldev, np_config->name, group_names,
1, function);
if (ret < 0) {
pinctrl_utils_free_map(pctldev, *maps, *num_maps);
return ret;
}
return 0;
}
static const struct pinctrl_ops mux_pinctrl_ops = {
.get_groups_count = pinctrl_generic_get_group_count,
.get_group_name = pinctrl_generic_get_group_name,
.get_group_pins = pinctrl_generic_get_group_pins,
.dt_node_to_map = mux_pinmux_dt_node_to_map,
.dt_free_map = pinctrl_utils_free_map,
};
static int mux_pinmux_set_mux(struct pinctrl_dev *pctldev,
unsigned int func_selector,
unsigned int group_selector)
{
struct mux_pinctrl *mpctl = pinctrl_dev_get_drvdata(pctldev);
const struct function_desc *function;
struct mux_pin_function *func;
int ret;
guard(mutex)(&mpctl->lock);
function = pinmux_generic_get_function(pctldev, func_selector);
func = function->data;
ret = mux_state_select(func->mux_state);
if (ret)
return ret;
return 0;
}
static void mux_pinmux_release_mux(struct pinctrl_dev *pctldev,
unsigned int func_selector,
unsigned int group_selector)
{
struct mux_pinctrl *mpctl = pinctrl_dev_get_drvdata(pctldev);
const struct function_desc *function;
struct mux_pin_function *func;
guard(mutex)(&mpctl->lock);
function = pinmux_generic_get_function(pctldev, func_selector);
func = function->data;
mux_state_deselect(func->mux_state);
}
static const struct pinmux_ops mux_pinmux_ops = {
.get_functions_count = pinmux_generic_get_function_count,
.get_function_name = pinmux_generic_get_function_name,
.get_function_groups = pinmux_generic_get_function_groups,
.set_mux = mux_pinmux_set_mux,
.release_mux = mux_pinmux_release_mux,
};
static int mux_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mux_pinctrl *mpctl;
struct pinctrl_desc *pctl_desc;
int ret;
mpctl = devm_kzalloc(dev, sizeof(*mpctl), GFP_KERNEL);
if (!mpctl)
return -ENOMEM;
mpctl->dev = dev;
platform_set_drvdata(pdev, mpctl);
pctl_desc = devm_kzalloc(dev, sizeof(*pctl_desc), GFP_KERNEL);
if (!pctl_desc)
return -ENOMEM;
ret = devm_mutex_init(dev, &mpctl->lock);
if (ret)
return ret;
pctl_desc->name = dev_name(dev);
pctl_desc->owner = THIS_MODULE;
pctl_desc->pctlops = &mux_pinctrl_ops;
pctl_desc->pmxops = &mux_pinmux_ops;
ret = devm_pinctrl_register_and_init(dev, pctl_desc, mpctl,
&mpctl->pctl);
if (ret)
return dev_err_probe(dev, ret, "Failed to register pinctrl.\n");
ret = pinctrl_enable(mpctl->pctl);
if (ret)
return dev_err_probe(dev, ret, "Failed to enable pinctrl.\n");
return 0;
}
static const struct of_device_id mux_pinctrl_of_match[] = {
{ .compatible = "pinctrl-multiplexer" },
{ }
};
MODULE_DEVICE_TABLE(of, mux_pinctrl_of_match);
static struct platform_driver mux_pinctrl_driver = {
.driver = {
.name = "generic-pinctrl-mux",
.of_match_table = mux_pinctrl_of_match,
},
.probe = mux_pinctrl_probe,
};
module_platform_driver(mux_pinctrl_driver);
MODULE_AUTHOR("Frank Li <Frank.Li@nxp.com>");
MODULE_DESCRIPTION("Generic Pin Control Driver for Board-Level Mux Chips");
MODULE_LICENSE("GPL");
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