RE: [PATCH v8 4/4] pinctrl: Implementation of the generic scmi-pinctrl driver

[Peng Fan <peng.fan@xxxxxxx>]

> Subject: [PATCH v8 4/4] pinctrl: Implementation of the generic scmi-pinctrl
> driver
> 
> From: Peng Fan <peng.fan@xxxxxxx>
> 
> scmi-pinctrl driver implements pinctrl driver interface and using SCMI
> protocol to redirect messages from pinctrl subsystem SDK to SCMI platform
> firmware, which does the changes in HW.

Considering pinctrl expects ENOTSUPP, so I would add this in v9.

diff --git a/drivers/pinctrl/pinctrl-scmi.c b/drivers/pinctrl/pinctrl-scmi.c
index 0f55f000a679..accebe3f0706 100644
--- a/drivers/pinctrl/pinctrl-scmi.c
+++ b/drivers/pinctrl/pinctrl-scmi.c
@@ -296,8 +296,12 @@ static int pinctrl_scmi_pinconf_get(struct pinctrl_dev *pctldev,
 
        ret = pinctrl_ops->settings_get_one(pmx->ph, pin, PIN_TYPE, type,
                                            &config_value);
-       if (ret)
+       if (ret) {
+               /* Convert SCMI error code to PINCTRL expected error code */
+               if (ret == -EOPNOTSUPP)
+                       ret = -ENOTSUPP;
                return ret;
+       }
 
        *config = pinconf_to_config_packed(config_type, config_value);
 
@@ -445,8 +449,12 @@ static int pinctrl_scmi_pinconf_group_get(struct pinctrl_dev *pctldev,
 
        ret = pinctrl_ops->settings_get_one(pmx->ph, group, GROUP_TYPE, type,
                                            &config_value);
-       if (ret)
+       if (ret) {
+               /* Convert SCMI error code to PINCTRL expected error code */
+               if (ret == -EOPNOTSUPP)
+                       ret = -ENOTSUPP;
                return ret;
+       }
 
        *config = pinconf_to_config_packed(config_type, config_value);

I will collect more comments before post v9. Just post out upper diff
to see any disagreements.

Thanks,
Peng.
> 
> Co-developed-by: Oleksii Moisieiev <oleksii_moisieiev@xxxxxxxx>
> Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@xxxxxxxx>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
>  MAINTAINERS                    |   1 +
>  drivers/pinctrl/Kconfig        |  11 +
>  drivers/pinctrl/Makefile       |   1 +
>  drivers/pinctrl/pinctrl-scmi.c | 564
> +++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 577 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4b511a55101c..d8270ac6651a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -21457,6 +21457,7 @@ F:	drivers/cpufreq/sc[mp]i-cpufreq.c
>  F:	drivers/firmware/arm_scmi/
>  F:	drivers/firmware/arm_scpi.c
>  F:	drivers/hwmon/scmi-hwmon.c
> +F:	drivers/pinctrl/pinctrl-scmi.c
>  F:	drivers/pmdomain/arm/
>  F:	drivers/powercap/arm_scmi_powercap.c
>  F:	drivers/regulator/scmi-regulator.c
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index
> d45657aa986a..4e6f65cf0e76 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -450,6 +450,17 @@ config PINCTRL_ROCKCHIP
>  	help
>            This support pinctrl and GPIO driver for Rockchip SoCs.
> 
> +config PINCTRL_SCMI
> +	tristate "Pinctrl driver using SCMI protocol interface"
> +	depends on ARM_SCMI_PROTOCOL || COMPILE_TEST
> +	select PINMUX
> +	select GENERIC_PINCONF
> +	help
> +	  This driver provides support for pinctrl which is controlled
> +	  by firmware that implements the SCMI interface.
> +	  It uses SCMI Message Protocol to interact with the
> +	  firmware providing all the pinctrl controls.
> +
>  config PINCTRL_SINGLE
>  	tristate "One-register-per-pin type device tree based pinctrl driver"
>  	depends on OF
> diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index
> 2152539b53d5..cc809669405a 100644
> --- a/drivers/pinctrl/Makefile
> +++ b/drivers/pinctrl/Makefile
> @@ -45,6 +45,7 @@ obj-$(CONFIG_PINCTRL_PIC32)	+= pinctrl-pic32.o
>  obj-$(CONFIG_PINCTRL_PISTACHIO)	+= pinctrl-pistachio.o
>  obj-$(CONFIG_PINCTRL_RK805)	+= pinctrl-rk805.o
>  obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
> +obj-$(CONFIG_PINCTRL_SCMI)	+= pinctrl-scmi.o
>  obj-$(CONFIG_PINCTRL_SINGLE)	+= pinctrl-single.o
>  obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
>  obj-$(CONFIG_PINCTRL_STMFX) 	+= pinctrl-stmfx.o
> diff --git a/drivers/pinctrl/pinctrl-scmi.c b/drivers/pinctrl/pinctrl-scmi.c new
> file mode 100644 index 000000000000..0f55f000a679
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-scmi.c
> @@ -0,0 +1,564 @@
> +// 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/dev_printk.h>
> +#include <linux/err.h>
> +#include <linux/module.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);
> +	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);
> +	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@xxxxxxxx>");
> +MODULE_AUTHOR("Peng Fan <peng.fan@xxxxxxx>");
> MODULE_DESCRIPTION("ARM
> +SCMI pin controller driver"); MODULE_LICENSE("GPL");
> 
> --
> 2.37.1