Hello Oleksij,
On 8/30/19 6:18 AM, Oleksij Rempel wrote:
> 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.fat...@pengutronix.de>
>> ---
>> 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?
Just stuff sitting on my own branches, but I figured it's useful
enough to have in the header.
>
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