gpio.h (1170B)
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