diff options
| author | Matti Vaittinen <mazziesaccount@gmail.com> | 2025-03-05 15:13:00 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2025-03-05 14:36:04 +0100 |
| commit | f636d4f60ac477187a466a573f947731fa762059 (patch) | |
| tree | 6c46162efdca8688a6e0a18b6c87a630949dfa8d /drivers/gpio/gpiolib.c | |
| parent | a501624864f3fd9ab785f1f674f48dca535b198c (diff) | |
gpio: Add a valid_mask getter
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>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index b5f472beb3bd..4c15a70d4d80 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -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) { |