| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | #endif |