1 /* 2 * This header provides constants for most GPIO bindings. 3 * 4 * Most GPIO bindings include a flags cell as part of the GPIO specifier. 5 * In most cases, the format of the flags cell uses the standard values 6 * defined in this header. 7 */ 8 9 #ifndef _DT_BINDINGS_GPIO_GPIO_H 10 #define _DT_BINDINGS_GPIO_GPIO_H 11 12 /* Bit 0 express polarity */ 13 #define GPIO_ACTIVE_HIGH 0 14 #define GPIO_ACTIVE_LOW 1 15 16 /* Bit 1 express single-endedness */ 17 #define GPIO_PUSH_PULL 0 18 #define GPIO_SINGLE_ENDED 2 19 20 /* 21 * Open Drain/Collector is the combination of single-ended active low, 22 * Open Source/Emitter is the combination of single-ended active high. 23 */ 24 #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_ACTIVE_LOW) 25 #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_ACTIVE_HIGH) 26 27 #endif 28