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| author | Mehmet Fide <mehmet.fide@screeningeagle.com> | 2026-09-15 10:05:00 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com> | 2026-09-21 11:14:49 +0200 |
| commit | fc291104d01a4e42b44132925c46655d4be5ed13 (patch) | |
| tree | bc0537ddb86a650d609be1c5844849a9aa016ca5 /include/linux | |
| parent | 9fbdc9ab1c304a99960cccb5300956cc73cb7020 (diff) | |
| download | linux-next-fc291104d01a4e42b44132925c46655d4be5ed13.tar.gz linux-next-fc291104d01a4e42b44132925c46655d4be5ed13.zip | |
gpiolib: add get_config() and gpiochip_generic_get_config()
A chip with a pin control backend sets a line's configuration through
set_config() and gpiochip_generic_config(), but has no way to read one
back. gpio-mmio needs that to learn the direction of a line whose
direction lives in the pin controller.
Add the optional get_config() callback, taking the packed parameter to
query and returning its bare argument the way pinctrl_gpio_get_config()
does, and gpiochip_generic_get_config() as the pin control backed
implementation, the mirror of gpiochip_generic_config(): a chip without
pin ranges, or a kernel without pinctrl, gets -ENOTSUPP.
Nothing in gpiolib calls get_config() and there is no consumer API; it
is for the chip's own use.
Suggested-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Mehmet Fide <mehmet.fide@screeningeagle.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260915080501.329424-4-mehmet.fide@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/gpio/driver.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 17511434ed07..4077dc678cae 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -359,6 +359,10 @@ struct gpio_irq_chip { * @set_config: optional hook for all kinds of settings. Uses the same * packed config format as generic pinconf. Must return 0 on success and * a negative error number on failure. + * @get_config: optional hook to read back a setting. Takes the packed + * generic pinconf parameter to query and returns its bare argument in + * the same variable, like pinctrl_gpio_get_config(). Must return 0 on + * success and a negative error number on failure. * @to_irq: optional hook supporting non-static gpiod_to_irq() mappings; * implementation may not sleep * @dbg_show: optional routine to show contents in debugfs; default code @@ -434,6 +438,9 @@ struct gpio_chip { int (*set_config)(struct gpio_chip *gc, unsigned int offset, unsigned long config); + int (*get_config)(struct gpio_chip *gc, + unsigned int offset, + unsigned long *config); int (*to_irq)(struct gpio_chip *gc, unsigned int offset); @@ -708,6 +715,8 @@ int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset); void gpiochip_generic_free(struct gpio_chip *gc, unsigned int offset); int gpiochip_generic_config(struct gpio_chip *gc, unsigned int offset, unsigned long config); +int gpiochip_generic_get_config(struct gpio_chip *gc, unsigned int offset, + unsigned long *config); /** * struct gpio_pin_range - pin range controlled by a gpio chip |