On Thu, Aug 29, 2019 at 02:43:18PM +0200, Ahmad Fatoum wrote:
> Sometimes we need to wait for state change on a GPIO,
> provide a helper to do this.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> ---
> include/gpio.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/include/gpio.h b/include/gpio.h
> index 1926edeca757..89cb306a195c 100644
> --- a/include/gpio.h
> +++ b/include/gpio.h
> @@ -3,6 +3,7 @@
>
> #include <linux/types.h>
> #include <linux/list.h>
> +#include <linux/iopoll.h>
>
> #ifdef CONFIG_GENERIC_GPIO
> void gpio_set_value(unsigned gpio, int value);
> @@ -31,6 +32,13 @@ static inline int gpio_direction_input(unsigned gpio)
> void gpio_set_active(unsigned gpio, bool state);
> int gpio_is_active(unsigned gpio);
> int gpio_direction_active(unsigned gpio, bool state);
> +
> +#define gpio_poll_timeout_us(gpio, active, timeout_us) \
> + ({ \
> + int __state; \
> + readx_poll_timeout(gpio_is_active, gpio, __state, \
> + __state == (active), timeout_us); \
> + })
> #else
> static inline void gpio_set_active(unsigned gpio, int value)
> {
> @@ -43,6 +51,8 @@ static inline int gpio_direction_active(unsigned gpio, int value)
> {
> return -EINVAL;
> }
> +
> +#define gpio_poll_timeout_us(gpio, val, timeout_us) (-ENOSYS)
> #endif
>
> #if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0
Do we already have some thing using this function?
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
