From b5fafa01bdaade5253bd39317f5455d13e6efc7d Mon Sep 17 00:00:00 2001 From: Jie Li Date: Mon, 11 May 2026 13:37:25 +0200 Subject: gpiolib: add gpiod_is_single_ended() helper The direction of a single-ended (open-drain or open-source) GPIO line cannot always be reliably determined by reading hardware registers. In true open-drain implementations, the "high" state is achieved by entering a high-impedance mode, which many hardware controllers report as "input" even if the software intends to use it as an output. This creates issues for consumer drivers (like I2C) that rely on gpiod_get_direction() to decide if a line can be driven. Introduce gpiod_is_single_ended() to allow consumers to check the software configuration (GPIO_FLAG_OPEN_DRAIN/GPIO_FLAG_OPEN_SOURCE) of a descriptor. This provides a robust way to identify lines that are capable of being driven, regardless of their instantaneous hardware state. Signed-off-by: Jie Li Reviewed-by: Linus Walleij Link: https://patch.msgid.link/20260511113726.49041-2-jie.i.li@nokia.com Signed-off-by: Bartosz Golaszewski --- include/linux/gpio/consumer.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux') diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index 3efb5cb1e1d1..8fb27f9aa67f 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -111,6 +111,7 @@ void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc); void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs); int gpiod_get_direction(struct gpio_desc *desc); +bool gpiod_is_single_ended(struct gpio_desc *desc); int gpiod_direction_input(struct gpio_desc *desc); int gpiod_direction_output(struct gpio_desc *desc, int value); int gpiod_direction_output_raw(struct gpio_desc *desc, int value); @@ -337,6 +338,10 @@ static inline int gpiod_get_direction(const struct gpio_desc *desc) WARN_ON(desc); return -ENOSYS; } +static inline bool gpiod_is_single_ended(struct gpio_desc *desc) +{ + return false; +} static inline int gpiod_direction_input(struct gpio_desc *desc) { /* GPIO can never have been requested */ -- cgit v1.2.3