diff options
| author | Michał Mirosław <mirq-linux@rere.qmqm.pl> | 2019-12-11 03:40:55 +0100 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-12-18 13:36:02 +0100 |
| commit | d3a5bcb4a17f1ad072484bb92c42519ff3aba6e1 (patch) | |
| tree | 3bbc5b18ec08c1bddbe71bfb63e5d4183ee7a321 /drivers/gpio | |
| parent | 2c3039c14380bc7b857f7afaaed68a0b8176c3db (diff) | |
| download | linux-d3a5bcb4a17f1ad072484bb92c42519ff3aba6e1.tar.bz2 | |
gpio: add gpiod_toggle_active_low()
Add possibility to toggle active-low flag of a gpio descriptor. This is
useful for compatibility code, where defaults are inverted vs DT gpio
flags or the active-low flag is taken from elsewhere.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Link: https://lore.kernel.org/r/7ce0338e01ad17fa5a227176813941b41a7c35c1.1576031637.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 9913886ede90..6130691e2047 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -3363,6 +3363,17 @@ int gpiod_is_active_low(const struct gpio_desc *desc) } EXPORT_SYMBOL_GPL(gpiod_is_active_low); +/** + * gpiod_toggle_active_low - toggle whether a GPIO is active-low or not + * @desc: the gpio descriptor to change + */ +void gpiod_toggle_active_low(struct gpio_desc *desc) +{ + VALIDATE_DESC_VOID(desc); + change_bit(FLAG_ACTIVE_LOW, &desc->flags); +} +EXPORT_SYMBOL_GPL(gpiod_toggle_active_low); + /* I/O calls are only valid after configuration completed; the relevant * "is this a valid GPIO" error checks should already have been done. * |