1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
3 * This header provides constants for most GPIO bindings.
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.
10 #ifndef _DT_BINDINGS_GPIO_GPIO_H
11 #define _DT_BINDINGS_GPIO_GPIO_H
13 /* Bit 0 express polarity */
14 #define GPIO_ACTIVE_HIGH 0
15 #define GPIO_ACTIVE_LOW 1
17 /* Bit 1 express single-endedness */
18 #define GPIO_PUSH_PULL 0
19 #define GPIO_SINGLE_ENDED 2
21 /* Bit 2 express Open drain or open source */
22 #define GPIO_LINE_OPEN_SOURCE 0
23 #define GPIO_LINE_OPEN_DRAIN 4
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.
29 #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)
30 #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)
32 /* Bit 3 express GPIO suspend/resume and reset persistence */
33 #define GPIO_PERSISTENT 0
34 #define GPIO_TRANSITORY 8
36 /* Bit 4 express pull up */
37 #define GPIO_PULL_UP 16
39 /* Bit 5 express pull down */
40 #define GPIO_PULL_DOWN 32
42 /* Bit 6 express pull disable */
43 #define GPIO_PULL_DISABLE 64