LXR uboot/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 and reset persistence */
  33#define GPIO_PERSISTENT 0
  34#define GPIO_TRANSITORY 8
  35
  36/* Bit 4 express pull up */
  37#define GPIO_PULL_UP 16
  38
  39/* Bit 5 express pull down */
  40#define GPIO_PULL_DOWN 32
  41
  42#endif
  43