dt-bindings/gpio/gpio.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * This header provides constants for most GPIO bindings.
0004  *
0005  * Most GPIO bindings include a flags cell as part of the GPIO specifier.
0006  * In most cases, the format of the flags cell uses the standard values
0007  * defined in this header.
0008  */
0009
0010 #ifndef _DT_BINDINGS_GPIO_GPIO_H
0011 #define _DT_BINDINGS_GPIO_GPIO_H
0012
0013 /* Bit 0 express polarity */
0014 #define GPIO_ACTIVE_HIGH 0
0015 #define GPIO_ACTIVE_LOW 1
0016
0017 /* Bit 1 express single-endedness */
0018 #define GPIO_PUSH_PULL 0
0019 #define GPIO_SINGLE_ENDED 2
0020
0021 /* Bit 2 express Open drain or open source */
0022 #define GPIO_LINE_OPEN_SOURCE 0
0023 #define GPIO_LINE_OPEN_DRAIN 4
0024
0025 /*
0026  * Open Drain/Collector is the combination of single-ended open drain interface.
0027  * Open Source/Emitter is the combination of single-ended open source interface.
0028  */
0029 #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)
0030 #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)
0031
0032 /* Bit 3 express GPIO suspend/resume and reset persistence */
0033 #define GPIO_PERSISTENT 0
0034 #define GPIO_TRANSITORY 8
0035
0036 /* Bit 4 express pull up */
0037 #define GPIO_PULL_UP 16
0038
0039 /* Bit 5 express pull down */
0040 #define GPIO_PULL_DOWN 32
0041
0042 /* Bit 6 express pull disable */
0043 #define GPIO_PULL_DISABLE 64
0044
0045 #endif