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 /* Bit 2 express Open drain or open source */
  21 #define GPIO_LINE_OPEN_SOURCE 0
  22 #define GPIO_LINE_OPEN_DRAIN 4
  23
  24 /*
  25  * Open Drain/Collector is the combination of single-ended open drain interface.
  26  * Open Source/Emitter is the combination of single-ended open source interface.
  27  */
  28 #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)
  29 #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)
  30
  31 /* Bit 3 express GPIO suspend/resume persistence */
  32 #define GPIO_SLEEP_MAINTAIN_VALUE 0
  33 #define GPIO_SLEEP_MAY_LOOSE_VALUE 8
  34
  35 #endif