include/dt-bindings/gpio/gpio.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * This header provides constants for most GPIO bindings.
   4  *
   5  * Most GPIO bindings include a flags cell as part of the GPIO specifier.
   6  * In most cases, the format of the flags cell uses the standard values
   7  * defined in this header.
   8  */
   9
  10 #ifndef _DT_BINDINGS_GPIO_GPIO_H
  11 #define _DT_BINDINGS_GPIO_GPIO_H
  12
  13 /* Bit 0 express polarity */
  14 #define GPIO_ACTIVE_HIGH 0
  15 #define GPIO_ACTIVE_LOW 1
  16
  17 /* Bit 1 express single-endedness */
  18 #define GPIO_PUSH_PULL 0
  19 #define GPIO_SINGLE_ENDED 2
  20
  21 /* Bit 2 express Open drain or open source */
  22 #define GPIO_LINE_OPEN_SOURCE 0
  23 #define GPIO_LINE_OPEN_DRAIN 4
  24
  25 /*
  26  * Open Drain/Collector is the combination of single-ended open drain interface.
  27  * Open Source/Emitter is the combination of single-ended open source interface.
  28  */
  29 #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)
  30 #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)
  31
  32 /* Bit 3 express GPIO suspend/resume persistence */
  33 #define GPIO_SLEEP_MAINTAIN_VALUE 0
  34 #define GPIO_SLEEP_MAY_LOSE_VALUE 8
  35
  36 #endif