diff options
Diffstat (limited to 'include/gpio.h')
| -rw-r--r-- | include/gpio.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/gpio.h b/include/gpio.h index 1926edeca7..4d5f2c25c7 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 +32,21 @@ 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); + +/** + * gpio_poll_timeout_us - Poll till GPIO reaches requested active state + * @gpio: gpio to poll + * @active: wait till GPIO is active if true, wait till it's inactive if false + * @timeout_us: timeout in microseconds + * + * During the wait barebox pollers are called, if any. + */ +#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 +59,8 @@ 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 |