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gpio: Add a valid_mask getter

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The valid_mask member of the struct gpio_chip is unconditionally written
by the GPIO core at driver registration. It shouldn't be directly
populated by drivers. This can be prevented by moving it from the struct
gpio_chip to struct gpio_device, which is internal to the GPIO core.

As a preparatory step, provide a getter function which can be used by
those drivers which need the valid_mask information.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/026f9d78502eca883bfe3faeb684e23d5d6c5e84.1741180097.git.mazziesaccount@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Matti Vaittinen
2025-03-05 15:13:00 +02:00
committed by Bartosz Golaszewski
parent a501624864
commit f636d4f60a
2 changed files with 17 additions and 0 deletions
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16
drivers/gpio/gpiolib.c
View File

@@ -723,6 +723,22 @@ static int gpiochip_add_pin_ranges(struct gpio_chip *gc)
return 0;
}
/**
* gpiochip_query_valid_mask - return the GPIO validity information
* @gc: gpio chip which validity information is queried
*
* Returns: bitmap representing valid GPIOs or NULL if all GPIOs are valid
*
* Some GPIO chips may support configurations where some of the pins aren't
* available. These chips can have valid_mask set to represent the valid
* GPIOs. This function can be used to retrieve this information.
*/
const unsigned long *gpiochip_query_valid_mask(const struct gpio_chip *gc)
{
return gc->valid_mask;
}
EXPORT_SYMBOL_GPL(gpiochip_query_valid_mask);
bool gpiochip_line_is_valid(const struct gpio_chip *gc,
unsigned int offset)
{

1
include/linux/gpio/driver.h
View File

@@ -720,6 +720,7 @@ bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
/* Sleep persistence inquiry for drivers */
bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset);
bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset);
const unsigned long *gpiochip_query_valid_mask(const struct gpio_chip *gc);
/* get driver data */
void *gpiochip_get_data(struct gpio_chip *gc);