| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * This header provides constants for most GPIO bindings. |
| * |
| * Most GPIO bindings include a flags cell as part of the GPIO specifier. |
| * In most cases, the format of the flags cell uses the standard values |
| * defined in this header. |
| */ |
| |
| #ifndef _DT_BINDINGS_GPIO_GPIO_H |
| #define _DT_BINDINGS_GPIO_GPIO_H |
| |
| /* Bit 0 express polarity */ |
| #define GPIO_ACTIVE_HIGH 0 |
| #define GPIO_ACTIVE_LOW 1 |
| |
| /* Bit 1 express single-endedness */ |
| #define GPIO_PUSH_PULL 0 |
| #define GPIO_SINGLE_ENDED 2 |
| |
| /* Bit 2 express Open drain or open source */ |
| #define GPIO_LINE_OPEN_SOURCE 0 |
| #define GPIO_LINE_OPEN_DRAIN 4 |
| |
| /* |
| * Open Drain/Collector is the combination of single-ended open drain interface. |
| * Open Source/Emitter is the combination of single-ended open source interface. |
| */ |
| #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN) |
| #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE) |
| |
| /* Bit 3 express GPIO suspend/resume persistence */ |
| #define GPIO_SLEEP_MAINTAIN_VALUE 0 |
| #define GPIO_SLEEP_MAY_LOOSE_VALUE 8 |
| |
| #endif |