drivers/pinctrl/pinctrl-scmi.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * System Control and Power Interface (SCMI) Protocol based pinctrl driver
  *
  * Copyright (C) 2024 EPAM
  * Copyright 2024 NXP
  */

 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/scmi_protocol.h>
 #include <linux/slab.h>
 #include <linux/types.h>

 #include <linux/pinctrl/machine.h>
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>

 #include "pinctrl-utils.h"
 #include "core.h"
 #include "pinconf.h"

 #define DRV_NAME "scmi-pinctrl"

 /* Define num configs, if not large than 4 use stack, else use kcalloc() */
 #define SCMI_NUM_CONFIGS	4

 static const struct scmi_pinctrl_proto_ops *pinctrl_ops;

 struct scmi_pinctrl {
 	struct device *dev;
 	struct scmi_protocol_handle *ph;
 	struct pinctrl_dev *pctldev;
 	struct pinctrl_desc pctl_desc;
 	struct pinfunction *functions;
 	unsigned int nr_functions;
 	struct pinctrl_pin_desc *pins;
 	unsigned int nr_pins;
 };

 static int pinctrl_scmi_get_groups_count(struct pinctrl_dev *pctldev)
 {
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pinctrl_ops->count_get(pmx->ph, GROUP_TYPE);
 }

 static const char *pinctrl_scmi_get_group_name(struct pinctrl_dev *pctldev,
 					       unsigned int selector)
 {
 	int ret;
 	const char *name;
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	ret = pinctrl_ops->name_get(pmx->ph, selector, GROUP_TYPE, &name);
 	if (ret) {
 		dev_err(pmx->dev, "get name failed with err %d", ret);
 		return NULL;
 	}

 	return name;
 }

 static int pinctrl_scmi_get_group_pins(struct pinctrl_dev *pctldev,
 				       unsigned int selector,
 				       const unsigned int **pins,
 				       unsigned int *num_pins)
 {
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pinctrl_ops->group_pins_get(pmx->ph, selector, pins, num_pins);
 }

 static const struct pinctrl_ops pinctrl_scmi_pinctrl_ops = {
 	.get_groups_count = pinctrl_scmi_get_groups_count,
 	.get_group_name = pinctrl_scmi_get_group_name,
 	.get_group_pins = pinctrl_scmi_get_group_pins,
 #ifdef CONFIG_OF
 	.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
 	.dt_free_map = pinconf_generic_dt_free_map,
 #endif
 };

 static int pinctrl_scmi_get_functions_count(struct pinctrl_dev *pctldev)
 {
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pinctrl_ops->count_get(pmx->ph, FUNCTION_TYPE);
 }

 static const char *pinctrl_scmi_get_function_name(struct pinctrl_dev *pctldev,
 						  unsigned int selector)
 {
 	int ret;
 	const char *name;
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	ret = pinctrl_ops->name_get(pmx->ph, selector, FUNCTION_TYPE, &name);
 	if (ret) {
 		dev_err(pmx->dev, "get name failed with err %d", ret);
 		return NULL;
 	}

 	return name;
 }

 static int pinctrl_scmi_get_function_groups(struct pinctrl_dev *pctldev,
 					    unsigned int selector,
 					    const char * const **p_groups,
 					    unsigned int * const p_num_groups)
 {
 	struct pinfunction *func;
 	const unsigned int *group_ids;
 	unsigned int num_groups;
 	const char **groups;
 	int ret, i;
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	if (!p_groups || !p_num_groups)
 		return -EINVAL;

 	if (selector >= pmx->nr_functions)
 		return -EINVAL;

 	func = &pmx->functions[selector];
 	if (func->ngroups)
 		goto done;

 	ret = pinctrl_ops->function_groups_get(pmx->ph, selector, &num_groups,
 					       &group_ids);
 	if (ret) {
 		dev_err(pmx->dev, "Unable to get function groups, err %d", ret);
 		return ret;
 	}
 	if (!num_groups)
 		return -EINVAL;

 	groups = kcalloc(num_groups, sizeof(*groups), GFP_KERNEL);
 	if (!groups)
 		return -ENOMEM;

 	for (i = 0; i < num_groups; i++) {
 		groups[i] = pinctrl_scmi_get_group_name(pctldev, group_ids[i]);
 		if (!groups[i]) {
 			ret = -EINVAL;
 			goto err_free;
 		}
 	}

 	func->ngroups = num_groups;
 	func->groups = groups;
 done:
 	*p_groups = func->groups;
 	*p_num_groups = func->ngroups;

 	return 0;

 err_free:
 	kfree(groups);

 	return ret;
 }

 static int pinctrl_scmi_func_set_mux(struct pinctrl_dev *pctldev,
 				     unsigned int selector, unsigned int group)
 {
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pinctrl_ops->mux_set(pmx->ph, selector, group);
 }

 static int pinctrl_scmi_request(struct pinctrl_dev *pctldev,
 				unsigned int offset)
 {
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pinctrl_ops->pin_request(pmx->ph, offset);
 }

 static int pinctrl_scmi_free(struct pinctrl_dev *pctldev, unsigned int offset)
 {
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pinctrl_ops->pin_free(pmx->ph, offset);
 }

 static const struct pinmux_ops pinctrl_scmi_pinmux_ops = {
 	.request = pinctrl_scmi_request,
 	.free = pinctrl_scmi_free,
 	.get_functions_count = pinctrl_scmi_get_functions_count,
 	.get_function_name = pinctrl_scmi_get_function_name,
 	.get_function_groups = pinctrl_scmi_get_function_groups,
 	.set_mux = pinctrl_scmi_func_set_mux,
 };

 static int pinctrl_scmi_map_pinconf_type(enum pin_config_param param,
 					 enum scmi_pinctrl_conf_type *type)
 {
 	u32 arg = param;

 	switch (arg) {
 	case PIN_CONFIG_BIAS_BUS_HOLD:
 		*type = SCMI_PIN_BIAS_BUS_HOLD;
 		break;
 	case PIN_CONFIG_BIAS_DISABLE:
 		*type = SCMI_PIN_BIAS_DISABLE;
 		break;
 	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
 		*type = SCMI_PIN_BIAS_HIGH_IMPEDANCE;
 		break;
 	case PIN_CONFIG_BIAS_PULL_DOWN:
 		*type = SCMI_PIN_BIAS_PULL_DOWN;
 		break;
 	case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
 		*type = SCMI_PIN_BIAS_PULL_DEFAULT;
 		break;
 	case PIN_CONFIG_BIAS_PULL_UP:
 		*type = SCMI_PIN_BIAS_PULL_UP;
 		break;
 	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 		*type = SCMI_PIN_DRIVE_OPEN_DRAIN;
 		break;
 	case PIN_CONFIG_DRIVE_OPEN_SOURCE:
 		*type = SCMI_PIN_DRIVE_OPEN_SOURCE;
 		break;
 	case PIN_CONFIG_DRIVE_PUSH_PULL:
 		*type = SCMI_PIN_DRIVE_PUSH_PULL;
 		break;
 	case PIN_CONFIG_DRIVE_STRENGTH:
 		*type = SCMI_PIN_DRIVE_STRENGTH;
 		break;
 	case PIN_CONFIG_DRIVE_STRENGTH_UA:
 		*type = SCMI_PIN_DRIVE_STRENGTH;
 		break;
 	case PIN_CONFIG_INPUT_DEBOUNCE:
 		*type = SCMI_PIN_INPUT_DEBOUNCE;
 		break;
 	case PIN_CONFIG_INPUT_ENABLE:
 		*type = SCMI_PIN_INPUT_MODE;
 		break;
 	case PIN_CONFIG_INPUT_SCHMITT:
 		*type = SCMI_PIN_INPUT_SCHMITT;
 		break;
 	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 		*type = SCMI_PIN_INPUT_MODE;
 		break;
 	case PIN_CONFIG_MODE_LOW_POWER:
 		*type = SCMI_PIN_LOW_POWER_MODE;
 		break;
 	case PIN_CONFIG_OUTPUT:
 		*type = SCMI_PIN_OUTPUT_VALUE;
 		break;
 	case PIN_CONFIG_OUTPUT_ENABLE:
 		*type = SCMI_PIN_OUTPUT_MODE;
 		break;
 	case PIN_CONFIG_OUTPUT_IMPEDANCE_OHMS:
 		*type = SCMI_PIN_OUTPUT_VALUE;
 		break;
 	case PIN_CONFIG_POWER_SOURCE:
 		*type = SCMI_PIN_POWER_SOURCE;
 		break;
 	case PIN_CONFIG_SLEW_RATE:
 		*type = SCMI_PIN_SLEW_RATE;
 		break;
 	case SCMI_PIN_OEM_START ... SCMI_PIN_OEM_END:
 		*type = arg;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int pinctrl_scmi_pinconf_get(struct pinctrl_dev *pctldev,
 				    unsigned int pin, unsigned long *config)
 {
 	int ret;
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
 	enum pin_config_param config_type;
 	enum scmi_pinctrl_conf_type type;
 	u32 config_value;

 	if (!config)
 		return -EINVAL;

 	config_type = pinconf_to_config_param(*config);

 	ret = pinctrl_scmi_map_pinconf_type(config_type, &type);
 	if (ret)
 		return ret;

 	ret = pinctrl_ops->settings_get_one(pmx->ph, pin, PIN_TYPE, type,
 					    &config_value);
 	/* Convert SCMI error code to PINCTRL expected error code */
 	if (ret == -EOPNOTSUPP)
 		return -ENOTSUPP;
 	if (ret)
 		return ret;

 	*config = pinconf_to_config_packed(config_type, config_value);

 	return 0;
 }

 static int
 pinctrl_scmi_alloc_configs(struct pinctrl_dev *pctldev, u32 num_configs,
 			   u32 **p_config_value,
 			   enum scmi_pinctrl_conf_type **p_config_type)
 {
 	if (num_configs <= SCMI_NUM_CONFIGS)
 		return 0;

 	*p_config_value = kcalloc(num_configs, sizeof(**p_config_value), GFP_KERNEL);
 	if (!*p_config_value)
 		return -ENOMEM;

 	*p_config_type = kcalloc(num_configs, sizeof(**p_config_type), GFP_KERNEL);
 	if (!*p_config_type) {
 		kfree(*p_config_value);
 		return -ENOMEM;
 	}

 	return 0;
 }

 static void
 pinctrl_scmi_free_configs(struct pinctrl_dev *pctldev, u32 num_configs,
 			  u32 **p_config_value,
 			  enum scmi_pinctrl_conf_type **p_config_type)
 {
 	if (num_configs <= SCMI_NUM_CONFIGS)
 		return;

 	kfree(*p_config_value);
 	kfree(*p_config_type);
 }

 static int pinctrl_scmi_pinconf_set(struct pinctrl_dev *pctldev,
 				    unsigned int pin,
 				    unsigned long *configs,
 				    unsigned int num_configs)
 {
 	int i, ret;
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
 	enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
 	u32 config_value[SCMI_NUM_CONFIGS];
 	enum scmi_pinctrl_conf_type *p_config_type = config_type;
 	u32 *p_config_value = config_value;
 	enum pin_config_param param;

 	if (!configs || !num_configs)
 		return -EINVAL;

 	ret = pinctrl_scmi_alloc_configs(pctldev, num_configs, &p_config_type,
 					 &p_config_value);
 	if (ret)
 		return ret;

 	for (i = 0; i < num_configs; i++) {
 		param = pinconf_to_config_param(configs[i]);
 		ret = pinctrl_scmi_map_pinconf_type(param, &p_config_type[i]);
 		if (ret) {
 			dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
 			goto free_config;
 		}
 		p_config_value[i] = pinconf_to_config_argument(configs[i]);
 	}

 	ret = pinctrl_ops->settings_conf(pmx->ph, pin, PIN_TYPE, num_configs,
 					 p_config_type,  p_config_value);
 	if (ret)
 		dev_err(pmx->dev, "Error parsing config %d\n", ret);

 free_config:
 	pinctrl_scmi_free_configs(pctldev, num_configs, &p_config_type,
 				  &p_config_value);
 	return ret;
 }

 static int pinctrl_scmi_pinconf_group_set(struct pinctrl_dev *pctldev,
 					  unsigned int group,
 					  unsigned long *configs,
 					  unsigned int num_configs)
 {
 	int i, ret;
 	struct scmi_pinctrl *pmx =  pinctrl_dev_get_drvdata(pctldev);
 	enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
 	u32 config_value[SCMI_NUM_CONFIGS];
 	enum scmi_pinctrl_conf_type *p_config_type = config_type;
 	u32 *p_config_value = config_value;
 	enum pin_config_param param;

 	if (!configs || !num_configs)
 		return -EINVAL;

 	ret = pinctrl_scmi_alloc_configs(pctldev, num_configs, &p_config_type,
 					 &p_config_value);
 	if (ret)
 		return ret;

 	for (i = 0; i < num_configs; i++) {
 		param = pinconf_to_config_param(configs[i]);
 		ret = pinctrl_scmi_map_pinconf_type(param, &p_config_type[i]);
 		if (ret) {
 			dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
 			goto free_config;
 		}

 		p_config_value[i] = pinconf_to_config_argument(configs[i]);
 	}

 	ret = pinctrl_ops->settings_conf(pmx->ph, group, GROUP_TYPE,
 					 num_configs, p_config_type,
 					 p_config_value);
 	if (ret)
 		dev_err(pmx->dev, "Error parsing config %d", ret);

 free_config:
 	pinctrl_scmi_free_configs(pctldev, num_configs, &p_config_type,
 				  &p_config_value);
 	return ret;
 };

 static int pinctrl_scmi_pinconf_group_get(struct pinctrl_dev *pctldev,
 					  unsigned int group,
 					  unsigned long *config)
 {
 	int ret;
 	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
 	enum pin_config_param config_type;
 	enum scmi_pinctrl_conf_type type;
 	u32 config_value;

 	if (!config)
 		return -EINVAL;

 	config_type = pinconf_to_config_param(*config);
 	ret = pinctrl_scmi_map_pinconf_type(config_type, &type);
 	if (ret) {
 		dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
 		return ret;
 	}

 	ret = pinctrl_ops->settings_get_one(pmx->ph, group, GROUP_TYPE, type,
 					    &config_value);
 	/* Convert SCMI error code to PINCTRL expected error code */
 	if (ret == -EOPNOTSUPP)
 		return -ENOTSUPP;
 	if (ret)
 		return ret;

 	*config = pinconf_to_config_packed(config_type, config_value);

 	return 0;
 }

 static const struct pinconf_ops pinctrl_scmi_pinconf_ops = {
 	.is_generic = true,
 	.pin_config_get = pinctrl_scmi_pinconf_get,
 	.pin_config_set = pinctrl_scmi_pinconf_set,
 	.pin_config_group_set = pinctrl_scmi_pinconf_group_set,
 	.pin_config_group_get = pinctrl_scmi_pinconf_group_get,
 	.pin_config_config_dbg_show = pinconf_generic_dump_config,
 };

 static int pinctrl_scmi_get_pins(struct scmi_pinctrl *pmx,
 				 struct pinctrl_desc *desc)
 {
 	struct pinctrl_pin_desc *pins;
 	unsigned int npins;
 	int ret, i;

 	npins = pinctrl_ops->count_get(pmx->ph, PIN_TYPE);
 	/*
 	 * npins will never be zero, the scmi pinctrl driver has bailed out
 	 * if npins is zero.
 	 */
 	pins = devm_kmalloc_array(pmx->dev, npins, sizeof(*pins), GFP_KERNEL);
 	if (!pins)
 		return -ENOMEM;

 	for (i = 0; i < npins; i++) {
 		pins[i].number = i;
 		/*
 		 * The memory for name is handled by the scmi firmware driver,
 		 * no need free here
 		 */
 		ret = pinctrl_ops->name_get(pmx->ph, i, PIN_TYPE, &pins[i].name);
 		if (ret)
 			return dev_err_probe(pmx->dev, ret,
 					     "Can't get name for pin %d", i);
 	}

 	desc->npins = npins;
 	desc->pins = pins;
 	dev_dbg(pmx->dev, "got pins %u", npins);

 	return 0;
 }

 static int scmi_pinctrl_probe(struct scmi_device *sdev)
 {
 	int ret;
 	struct device *dev = &sdev->dev;
 	struct scmi_pinctrl *pmx;
 	const struct scmi_handle *handle;
 	struct scmi_protocol_handle *ph;

 	if (!sdev->handle)
 		return -EINVAL;

 	handle = sdev->handle;

 	pinctrl_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PINCTRL, &ph);
 	if (IS_ERR(pinctrl_ops))
 		return PTR_ERR(pinctrl_ops);

 	pmx = devm_kzalloc(dev, sizeof(*pmx), GFP_KERNEL);
 	if (!pmx)
 		return -ENOMEM;

 	pmx->ph = ph;

 	pmx->dev = dev;
 	pmx->pctl_desc.name = DRV_NAME;
 	pmx->pctl_desc.owner = THIS_MODULE;
 	pmx->pctl_desc.pctlops = &pinctrl_scmi_pinctrl_ops;
 	pmx->pctl_desc.pmxops = &pinctrl_scmi_pinmux_ops;
 	pmx->pctl_desc.confops = &pinctrl_scmi_pinconf_ops;

 	ret = pinctrl_scmi_get_pins(pmx, &pmx->pctl_desc);
 	if (ret)
 		return ret;

 	ret = devm_pinctrl_register_and_init(dev, &pmx->pctl_desc, pmx,
 					     &pmx->pctldev);
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to register pinctrl\n");

 	pmx->nr_functions = pinctrl_scmi_get_functions_count(pmx->pctldev);
 	pmx->functions = devm_kcalloc(dev, pmx->nr_functions,
 				      sizeof(*pmx->functions), GFP_KERNEL);
 	if (!pmx->functions)
 		return -ENOMEM;

 	return pinctrl_enable(pmx->pctldev);
 }

 static const struct scmi_device_id scmi_id_table[] = {
 	{ SCMI_PROTOCOL_PINCTRL, "pinctrl" },
 	{ }
 };
 MODULE_DEVICE_TABLE(scmi, scmi_id_table);

 static struct scmi_driver scmi_pinctrl_driver = {
 	.name = DRV_NAME,
 	.probe = scmi_pinctrl_probe,
 	.id_table = scmi_id_table,
 };
 module_scmi_driver(scmi_pinctrl_driver);

 MODULE_AUTHOR("Oleksii Moisieiev <oleksii_moisieiev@epam.com>");
 MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
 MODULE_DESCRIPTION("ARM SCMI pin controller driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* System Control and Power Interface (SCMI) Protocol based pinctrl driver
	*
	* Copyright (C) 2024 EPAM
	* Copyright 2024 NXP
	*/

	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/errno.h>
	#include <linux/module.h>
	#include <linux/mod_devicetable.h>
	#include <linux/scmi_protocol.h>
	#include <linux/slab.h>
	#include <linux/types.h>

	#include <linux/pinctrl/machine.h>
	#include <linux/pinctrl/pinconf.h>
	#include <linux/pinctrl/pinconf-generic.h>
	#include <linux/pinctrl/pinctrl.h>
	#include <linux/pinctrl/pinmux.h>

	#include "pinctrl-utils.h"
	#include "core.h"
	#include "pinconf.h"

	#define DRV_NAME "scmi-pinctrl"

	/* Define num configs, if not large than 4 use stack, else use kcalloc() */
	#define SCMI_NUM_CONFIGS 4

	static const struct scmi_pinctrl_proto_ops *pinctrl_ops;

	struct scmi_pinctrl {
	struct device *dev;
	struct scmi_protocol_handle *ph;
	struct pinctrl_dev *pctldev;
	struct pinctrl_desc pctl_desc;
	struct pinfunction *functions;
	unsigned int nr_functions;
	struct pinctrl_pin_desc *pins;
	unsigned int nr_pins;
	};

	static int pinctrl_scmi_get_groups_count(struct pinctrl_dev *pctldev)
	{
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pinctrl_ops->count_get(pmx->ph, GROUP_TYPE);
	}

	static const char pinctrl_scmi_get_group_name(struct pinctrl_dev pctldev,
	unsigned int selector)
	{
	int ret;
	const char *name;
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	ret = pinctrl_ops->name_get(pmx->ph, selector, GROUP_TYPE, &name);
	if (ret) {
	dev_err(pmx->dev, "get name failed with err %d", ret);
	return NULL;
	}

	return name;
	}

	static int pinctrl_scmi_get_group_pins(struct pinctrl_dev *pctldev,
	unsigned int selector,
	const unsigned int **pins,
	unsigned int *num_pins)
	{
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pinctrl_ops->group_pins_get(pmx->ph, selector, pins, num_pins);
	}

	static const struct pinctrl_ops pinctrl_scmi_pinctrl_ops = {
	.get_groups_count = pinctrl_scmi_get_groups_count,
	.get_group_name = pinctrl_scmi_get_group_name,
	.get_group_pins = pinctrl_scmi_get_group_pins,
	#ifdef CONFIG_OF
	.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
	.dt_free_map = pinconf_generic_dt_free_map,
	#endif
	};

	static int pinctrl_scmi_get_functions_count(struct pinctrl_dev *pctldev)
	{
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pinctrl_ops->count_get(pmx->ph, FUNCTION_TYPE);
	}

	static const char pinctrl_scmi_get_function_name(struct pinctrl_dev pctldev,
	unsigned int selector)
	{
	int ret;
	const char *name;
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	ret = pinctrl_ops->name_get(pmx->ph, selector, FUNCTION_TYPE, &name);
	if (ret) {
	dev_err(pmx->dev, "get name failed with err %d", ret);
	return NULL;
	}

	return name;
	}

	static int pinctrl_scmi_get_function_groups(struct pinctrl_dev *pctldev,
	unsigned int selector,
	const char * const **p_groups,
	unsigned int * const p_num_groups)
	{
	struct pinfunction *func;
	const unsigned int *group_ids;
	unsigned int num_groups;
	const char **groups;
	int ret, i;
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	if (!p_groups \|\| !p_num_groups)
	return -EINVAL;

	if (selector >= pmx->nr_functions)
	return -EINVAL;

	func = &pmx->functions[selector];
	if (func->ngroups)
	goto done;

	ret = pinctrl_ops->function_groups_get(pmx->ph, selector, &num_groups,
	&group_ids);
	if (ret) {
	dev_err(pmx->dev, "Unable to get function groups, err %d", ret);
	return ret;
	}
	if (!num_groups)
	return -EINVAL;

	groups = kcalloc(num_groups, sizeof(*groups), GFP_KERNEL);
	if (!groups)
	return -ENOMEM;

	for (i = 0; i < num_groups; i++) {
	groups[i] = pinctrl_scmi_get_group_name(pctldev, group_ids[i]);
	if (!groups[i]) {
	ret = -EINVAL;
	goto err_free;
	}
	}

	func->ngroups = num_groups;
	func->groups = groups;
	done:
	*p_groups = func->groups;
	*p_num_groups = func->ngroups;

	return 0;

	err_free:
	kfree(groups);

	return ret;
	}

	static int pinctrl_scmi_func_set_mux(struct pinctrl_dev *pctldev,
	unsigned int selector, unsigned int group)
	{
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pinctrl_ops->mux_set(pmx->ph, selector, group);
	}

	static int pinctrl_scmi_request(struct pinctrl_dev *pctldev,
	unsigned int offset)
	{
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pinctrl_ops->pin_request(pmx->ph, offset);
	}

	static int pinctrl_scmi_free(struct pinctrl_dev *pctldev, unsigned int offset)
	{
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pinctrl_ops->pin_free(pmx->ph, offset);
	}

	static const struct pinmux_ops pinctrl_scmi_pinmux_ops = {
	.request = pinctrl_scmi_request,
	.free = pinctrl_scmi_free,
	.get_functions_count = pinctrl_scmi_get_functions_count,
	.get_function_name = pinctrl_scmi_get_function_name,
	.get_function_groups = pinctrl_scmi_get_function_groups,
	.set_mux = pinctrl_scmi_func_set_mux,
	};

	static int pinctrl_scmi_map_pinconf_type(enum pin_config_param param,
	enum scmi_pinctrl_conf_type *type)
	{
	u32 arg = param;

	switch (arg) {
	case PIN_CONFIG_BIAS_BUS_HOLD:
	*type = SCMI_PIN_BIAS_BUS_HOLD;
	break;
	case PIN_CONFIG_BIAS_DISABLE:
	*type = SCMI_PIN_BIAS_DISABLE;
	break;
	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
	*type = SCMI_PIN_BIAS_HIGH_IMPEDANCE;
	break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
	*type = SCMI_PIN_BIAS_PULL_DOWN;
	break;
	case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
	*type = SCMI_PIN_BIAS_PULL_DEFAULT;
	break;
	case PIN_CONFIG_BIAS_PULL_UP:
	*type = SCMI_PIN_BIAS_PULL_UP;
	break;
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	*type = SCMI_PIN_DRIVE_OPEN_DRAIN;
	break;
	case PIN_CONFIG_DRIVE_OPEN_SOURCE:
	*type = SCMI_PIN_DRIVE_OPEN_SOURCE;
	break;
	case PIN_CONFIG_DRIVE_PUSH_PULL:
	*type = SCMI_PIN_DRIVE_PUSH_PULL;
	break;
	case PIN_CONFIG_DRIVE_STRENGTH:
	*type = SCMI_PIN_DRIVE_STRENGTH;
	break;
	case PIN_CONFIG_DRIVE_STRENGTH_UA:
	*type = SCMI_PIN_DRIVE_STRENGTH;
	break;
	case PIN_CONFIG_INPUT_DEBOUNCE:
	*type = SCMI_PIN_INPUT_DEBOUNCE;
	break;
	case PIN_CONFIG_INPUT_ENABLE:
	*type = SCMI_PIN_INPUT_MODE;
	break;
	case PIN_CONFIG_INPUT_SCHMITT:
	*type = SCMI_PIN_INPUT_SCHMITT;
	break;
	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
	*type = SCMI_PIN_INPUT_MODE;
	break;
	case PIN_CONFIG_MODE_LOW_POWER:
	*type = SCMI_PIN_LOW_POWER_MODE;
	break;
	case PIN_CONFIG_OUTPUT:
	*type = SCMI_PIN_OUTPUT_VALUE;
	break;
	case PIN_CONFIG_OUTPUT_ENABLE:
	*type = SCMI_PIN_OUTPUT_MODE;
	break;
	case PIN_CONFIG_OUTPUT_IMPEDANCE_OHMS:
	*type = SCMI_PIN_OUTPUT_VALUE;
	break;
	case PIN_CONFIG_POWER_SOURCE:
	*type = SCMI_PIN_POWER_SOURCE;
	break;
	case PIN_CONFIG_SLEW_RATE:
	*type = SCMI_PIN_SLEW_RATE;
	break;
	case SCMI_PIN_OEM_START ... SCMI_PIN_OEM_END:
	*type = arg;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int pinctrl_scmi_pinconf_get(struct pinctrl_dev *pctldev,
	unsigned int pin, unsigned long *config)
	{
	int ret;
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	enum pin_config_param config_type;
	enum scmi_pinctrl_conf_type type;
	u32 config_value;

	if (!config)
	return -EINVAL;

	config_type = pinconf_to_config_param(*config);

	ret = pinctrl_scmi_map_pinconf_type(config_type, &type);
	if (ret)
	return ret;

	ret = pinctrl_ops->settings_get_one(pmx->ph, pin, PIN_TYPE, type,
	&config_value);
	/* Convert SCMI error code to PINCTRL expected error code */
	if (ret == -EOPNOTSUPP)
	return -ENOTSUPP;
	if (ret)
	return ret;

	*config = pinconf_to_config_packed(config_type, config_value);

	return 0;
	}

	static int
	pinctrl_scmi_alloc_configs(struct pinctrl_dev *pctldev, u32 num_configs,
	u32 **p_config_value,
	enum scmi_pinctrl_conf_type **p_config_type)
	{
	if (num_configs <= SCMI_NUM_CONFIGS)
	return 0;

	p_config_value = kcalloc(num_configs, sizeof(*p_config_value), GFP_KERNEL);
	if (!*p_config_value)
	return -ENOMEM;

	p_config_type = kcalloc(num_configs, sizeof(*p_config_type), GFP_KERNEL);
	if (!*p_config_type) {
	kfree(*p_config_value);
	return -ENOMEM;
	}

	return 0;
	}

	static void
	pinctrl_scmi_free_configs(struct pinctrl_dev *pctldev, u32 num_configs,
	u32 **p_config_value,
	enum scmi_pinctrl_conf_type **p_config_type)
	{
	if (num_configs <= SCMI_NUM_CONFIGS)
	return;

	kfree(*p_config_value);
	kfree(*p_config_type);
	}

	static int pinctrl_scmi_pinconf_set(struct pinctrl_dev *pctldev,
	unsigned int pin,
	unsigned long *configs,
	unsigned int num_configs)
	{
	int i, ret;
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
	u32 config_value[SCMI_NUM_CONFIGS];
	enum scmi_pinctrl_conf_type *p_config_type = config_type;
	u32 *p_config_value = config_value;
	enum pin_config_param param;

	if (!configs \|\| !num_configs)
	return -EINVAL;

	ret = pinctrl_scmi_alloc_configs(pctldev, num_configs, &p_config_type,
	&p_config_value);
	if (ret)
	return ret;

	for (i = 0; i < num_configs; i++) {
	param = pinconf_to_config_param(configs[i]);
	ret = pinctrl_scmi_map_pinconf_type(param, &p_config_type[i]);
	if (ret) {
	dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
	goto free_config;
	}
	p_config_value[i] = pinconf_to_config_argument(configs[i]);
	}

	ret = pinctrl_ops->settings_conf(pmx->ph, pin, PIN_TYPE, num_configs,
	p_config_type, p_config_value);
	if (ret)
	dev_err(pmx->dev, "Error parsing config %d\n", ret);

	free_config:
	pinctrl_scmi_free_configs(pctldev, num_configs, &p_config_type,
	&p_config_value);
	return ret;
	}

	static int pinctrl_scmi_pinconf_group_set(struct pinctrl_dev *pctldev,
	unsigned int group,
	unsigned long *configs,
	unsigned int num_configs)
	{
	int i, ret;
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	enum scmi_pinctrl_conf_type config_type[SCMI_NUM_CONFIGS];
	u32 config_value[SCMI_NUM_CONFIGS];
	enum scmi_pinctrl_conf_type *p_config_type = config_type;
	u32 *p_config_value = config_value;
	enum pin_config_param param;

	if (!configs \|\| !num_configs)
	return -EINVAL;

	ret = pinctrl_scmi_alloc_configs(pctldev, num_configs, &p_config_type,
	&p_config_value);
	if (ret)
	return ret;

	for (i = 0; i < num_configs; i++) {
	param = pinconf_to_config_param(configs[i]);
	ret = pinctrl_scmi_map_pinconf_type(param, &p_config_type[i]);
	if (ret) {
	dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
	goto free_config;
	}

	p_config_value[i] = pinconf_to_config_argument(configs[i]);
	}

	ret = pinctrl_ops->settings_conf(pmx->ph, group, GROUP_TYPE,
	num_configs, p_config_type,
	p_config_value);
	if (ret)
	dev_err(pmx->dev, "Error parsing config %d", ret);

	free_config:
	pinctrl_scmi_free_configs(pctldev, num_configs, &p_config_type,
	&p_config_value);
	return ret;
	};

	static int pinctrl_scmi_pinconf_group_get(struct pinctrl_dev *pctldev,
	unsigned int group,
	unsigned long *config)
	{
	int ret;
	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
	enum pin_config_param config_type;
	enum scmi_pinctrl_conf_type type;
	u32 config_value;

	if (!config)
	return -EINVAL;

	config_type = pinconf_to_config_param(*config);
	ret = pinctrl_scmi_map_pinconf_type(config_type, &type);
	if (ret) {
	dev_err(pmx->dev, "Error map pinconf_type %d\n", ret);
	return ret;
	}

	ret = pinctrl_ops->settings_get_one(pmx->ph, group, GROUP_TYPE, type,
	&config_value);
	/* Convert SCMI error code to PINCTRL expected error code */
	if (ret == -EOPNOTSUPP)
	return -ENOTSUPP;
	if (ret)
	return ret;

	*config = pinconf_to_config_packed(config_type, config_value);

	return 0;
	}

	static const struct pinconf_ops pinctrl_scmi_pinconf_ops = {
	.is_generic = true,
	.pin_config_get = pinctrl_scmi_pinconf_get,
	.pin_config_set = pinctrl_scmi_pinconf_set,
	.pin_config_group_set = pinctrl_scmi_pinconf_group_set,
	.pin_config_group_get = pinctrl_scmi_pinconf_group_get,
	.pin_config_config_dbg_show = pinconf_generic_dump_config,
	};

	static int pinctrl_scmi_get_pins(struct scmi_pinctrl *pmx,
	struct pinctrl_desc *desc)
	{
	struct pinctrl_pin_desc *pins;
	unsigned int npins;
	int ret, i;

	npins = pinctrl_ops->count_get(pmx->ph, PIN_TYPE);
	/*
	* npins will never be zero, the scmi pinctrl driver has bailed out
	* if npins is zero.
	*/
	pins = devm_kmalloc_array(pmx->dev, npins, sizeof(*pins), GFP_KERNEL);
	if (!pins)
	return -ENOMEM;

	for (i = 0; i < npins; i++) {
	pins[i].number = i;
	/*
	* The memory for name is handled by the scmi firmware driver,
	* no need free here
	*/
	ret = pinctrl_ops->name_get(pmx->ph, i, PIN_TYPE, &pins[i].name);
	if (ret)
	return dev_err_probe(pmx->dev, ret,
	"Can't get name for pin %d", i);
	}

	desc->npins = npins;
	desc->pins = pins;
	dev_dbg(pmx->dev, "got pins %u", npins);

	return 0;
	}

	static int scmi_pinctrl_probe(struct scmi_device *sdev)
	{
	int ret;
	struct device *dev = &sdev->dev;
	struct scmi_pinctrl *pmx;
	const struct scmi_handle *handle;
	struct scmi_protocol_handle *ph;

	if (!sdev->handle)
	return -EINVAL;

	handle = sdev->handle;

	pinctrl_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PINCTRL, &ph);
	if (IS_ERR(pinctrl_ops))
	return PTR_ERR(pinctrl_ops);

	pmx = devm_kzalloc(dev, sizeof(*pmx), GFP_KERNEL);
	if (!pmx)
	return -ENOMEM;

	pmx->ph = ph;

	pmx->dev = dev;
	pmx->pctl_desc.name = DRV_NAME;
	pmx->pctl_desc.owner = THIS_MODULE;
	pmx->pctl_desc.pctlops = &pinctrl_scmi_pinctrl_ops;
	pmx->pctl_desc.pmxops = &pinctrl_scmi_pinmux_ops;
	pmx->pctl_desc.confops = &pinctrl_scmi_pinconf_ops;

	ret = pinctrl_scmi_get_pins(pmx, &pmx->pctl_desc);
	if (ret)
	return ret;

	ret = devm_pinctrl_register_and_init(dev, &pmx->pctl_desc, pmx,
	&pmx->pctldev);
	if (ret)
	return dev_err_probe(dev, ret, "Failed to register pinctrl\n");

	pmx->nr_functions = pinctrl_scmi_get_functions_count(pmx->pctldev);
	pmx->functions = devm_kcalloc(dev, pmx->nr_functions,
	sizeof(*pmx->functions), GFP_KERNEL);
	if (!pmx->functions)
	return -ENOMEM;

	return pinctrl_enable(pmx->pctldev);
	}

	static const struct scmi_device_id scmi_id_table[] = {
	{ SCMI_PROTOCOL_PINCTRL, "pinctrl" },
	{ }
	};
	MODULE_DEVICE_TABLE(scmi, scmi_id_table);

	static struct scmi_driver scmi_pinctrl_driver = {
	.name = DRV_NAME,
	.probe = scmi_pinctrl_probe,
	.id_table = scmi_id_table,
	};
	module_scmi_driver(scmi_pinctrl_driver);

	MODULE_AUTHOR("Oleksii Moisieiev <oleksii_moisieiev@epam.com>");
	MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
	MODULE_DESCRIPTION("ARM SCMI pin controller driver");
	MODULE_LICENSE("GPL");