include/dt-bindings/gpio/gpio.h

   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