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pinctrl: introduce pinctrl_gpio_get_config()

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This is a counterpart of pinctrl_gpio_set_config(), which will be used
to implement the ->get() interface in a GPIO driver for SCMI.

This also requires that we create a stub so pin_config_get_for_pin()
can build when CONFIG_PINCONF is disabled.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>
This commit is contained in:
AKASHI Takahiro 2026-03-23 22:01:10 +03:00 committed by Linus Walleij
parent 6de23f81a5
commit 96b76f7bc5
3 changed files with 46 additions and 0 deletions
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31
drivers/pinctrl/core.c
View File

@ -30,6 +30,7 @@
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/devinfo.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include "core.h"
@ -938,6 +939,36 @@ int pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
/**
* pinctrl_gpio_get_config() - Get the config for a given GPIO pin
* @gc: GPIO chip structure from the GPIO subsystem
* @offset: hardware offset of the GPIO relative to the controller
* @config: the configuration to query. On success it holds the result
* Return: 0 on success, negative errno otherwise
*/
int pinctrl_gpio_get_config(struct gpio_chip *gc, unsigned int offset, unsigned long *config)
{
struct pinctrl_gpio_range *range;
struct pinctrl_dev *pctldev;
int ret, pin;
ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
if (ret)
return ret;
mutex_lock(&pctldev->mutex);
pin = gpio_to_pin(range, gc, offset);
ret = pin_config_get_for_pin(pctldev, pin, config);
mutex_unlock(&pctldev->mutex);
if (ret)
return ret;
*config = pinconf_to_config_argument(*config);
return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_get_config);
static struct pinctrl_state *find_state(struct pinctrl *p,
const char *name)
{

6
drivers/pinctrl/pinconf.h
View File

@ -74,6 +74,12 @@ static inline int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned int p
return -ENOTSUPP;
}
static inline int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
return -ENOTSUPP;
}
#endif
#if defined(CONFIG_PINCONF) && defined(CONFIG_DEBUG_FS)

9
include/linux/pinctrl/consumer.h
View File

@ -35,6 +35,8 @@ int pinctrl_gpio_direction_output(struct gpio_chip *gc,
unsigned int offset);
int pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config);
int pinctrl_gpio_get_config(struct gpio_chip *gc, unsigned int offset,
unsigned long *config);
struct pinctrl * __must_check pinctrl_get(struct device *dev);
void pinctrl_put(struct pinctrl *p);
@ -101,6 +103,13 @@ pinctrl_gpio_direction_output(struct gpio_chip *gc, unsigned int offset)
return 0;
}
static inline int
pinctrl_gpio_get_config(struct gpio_chip *gc, unsigned int offset,
unsigned long *config)
{
return 0;
}
static inline int
pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config)