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gpiolib: provide generic request/free implementations

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Provide generic request/free implementations that pinctrl aware gpio
drivers can use instead of open coding if they use a 1:1 pin to gpio
signal mapping.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Jonas Gorski 2015-10-11 17:34:15 +02:00 • committed by Linus Walleij
commit c771c2f484
2 changed files with 26 additions and 0 deletions
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23
drivers/gpio/gpiolib.c
View file

@ -15,6 +15,7 @@
#include <linux/acpi.h> #include <linux/acpi.h>
#include <linux/gpio/driver.h> #include <linux/gpio/driver.h>
#include <linux/gpio/machine.h> #include <linux/gpio/machine.h>
#include <linux/pinctrl/consumer.h>
#include "gpiolib.h" #include "gpiolib.h"
@ -745,6 +746,28 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
#endif /* CONFIG_GPIOLIB_IRQCHIP */ #endif /* CONFIG_GPIOLIB_IRQCHIP */
/**
* gpiochip_generic_request() - request the gpio function for a pin
* @chip: the gpiochip owning the GPIO
* @offset: the offset of the GPIO to request for GPIO function
*/
int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_request_gpio(chip->base + offset);
}
EXPORT_SYMBOL_GPL(gpiochip_generic_request);
/**
* gpiochip_generic_free() - free the gpio function from a pin
* @chip: the gpiochip to request the gpio function for
* @offset: the offset of the GPIO to free from GPIO function
*/
void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset)
{
pinctrl_free_gpio(chip->base + offset);
}
EXPORT_SYMBOL_GPL(gpiochip_generic_free);
#ifdef CONFIG_PINCTRL #ifdef CONFIG_PINCTRL
/** /**

3
include/linux/gpio/driver.h
View file

@ -206,6 +206,9 @@ int _gpiochip_irqchip_add(struct gpio_chip *gpiochip,
#endif /* CONFIG_GPIOLIB_IRQCHIP */ #endif /* CONFIG_GPIOLIB_IRQCHIP */
int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset);
void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset);
#ifdef CONFIG_PINCTRL #ifdef CONFIG_PINCTRL
/** /**