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gpio: export gpiod_hwgpio() 

Reading the GPIO hardware number from a descriptor is a valid use-case
outside of the GPIO core. Export the symbol to consumers of GPIO
descriptors.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Link: https://lore.kernel.org/r/20251016-aspeed-gpiolib-include-v1-2-31201c06d124@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2025-10-16 11:09:26 +02:00
parent df900536e8
commit d19f6451c6
3 changed files with 15 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/gpio/gpiolib.c
View File

@ -235,6 +235,19 @@ int desc_to_gpio(const struct gpio_desc *desc)
}
EXPORT_SYMBOL_GPL(desc_to_gpio);
/**
* gpiod_hwgpio - Return the GPIO number of the passed descriptor relative to
* its chip.
* @desc: GPIO descriptor
*
* Returns:
* Hardware offset of the GPIO represented by the descriptor.
*/
int gpiod_hwgpio(const struct gpio_desc *desc)
{
return desc - &desc->gdev->descs[0];
}
EXPORT_SYMBOL_GPL(gpiod_hwgpio);
/**
* gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs

8
drivers/gpio/gpiolib.h
View File

@ -273,14 +273,6 @@ int gpiochip_get_ngpios(struct gpio_chip *gc, struct device *dev);
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
const char *gpiod_get_label(struct gpio_desc *desc);
/*
* Return the GPIO number of the passed descriptor relative to its chip
*/
static inline int gpiod_hwgpio(const struct gpio_desc *desc)
{
return desc - &desc->gdev->descs[0];
}
/* With descriptor prefix */
#define __gpiod_pr(level, desc, fmt, ...) \

2
include/linux/gpio/consumer.h
View File

@ -171,6 +171,8 @@ int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name);
struct gpio_desc *gpio_to_desc(unsigned gpio);
int desc_to_gpio(const struct gpio_desc *desc);
int gpiod_hwgpio(const struct gpio_desc *desc);
struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode,
const char *con_id, int index,
enum gpiod_flags flags,