diff options
Diffstat (limited to 'include/dt-bindings/gpio/gpio.h')
| -rw-r--r-- | include/dt-bindings/gpio/gpio.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/dt-bindings/gpio/gpio.h b/include/dt-bindings/gpio/gpio.h new file mode 100644 index 000000000000..c673d2c87c60 --- /dev/null +++ b/include/dt-bindings/gpio/gpio.h @@ -0,0 +1,27 @@ +/* + * This header provides constants for most GPIO bindings. + * + * Most GPIO bindings include a flags cell as part of the GPIO specifier. + * In most cases, the format of the flags cell uses the standard values + * defined in this header. + */ + +#ifndef _DT_BINDINGS_GPIO_GPIO_H +#define _DT_BINDINGS_GPIO_GPIO_H + +/* Bit 0 express polarity */ +#define GPIO_ACTIVE_HIGH 0 +#define GPIO_ACTIVE_LOW 1 + +/* Bit 1 express single-endedness */ +#define GPIO_PUSH_PULL 0 +#define GPIO_SINGLE_ENDED 2 + +/* + * Open Drain/Collector is the combination of single-ended active low, + * Open Source/Emitter is the combination of single-ended active high. + */ +#define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_ACTIVE_LOW) +#define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_ACTIVE_HIGH) + +#endif |