| Stephen Warren | 71fab21 | 2013-02-12 17:22:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This header provides constants for most GPIO bindings. |
| 3 | * |
| 4 | * Most GPIO bindings include a flags cell as part of the GPIO specifier. |
| 5 | * In most cases, the format of the flags cell uses the standard values |
| 6 | * defined in this header. |
| 7 | */ |
| 8 | |
| 9 | #ifndef _DT_BINDINGS_GPIO_GPIO_H |
| 10 | #define _DT_BINDINGS_GPIO_GPIO_H |
| 11 | |
| Linus Walleij | 69d301f | 2015-09-24 15:05:45 -0700 | [diff] [blame] | 12 | /* Bit 0 express polarity */ |
| Stephen Warren | 71fab21 | 2013-02-12 17:22:36 -0700 | [diff] [blame] | 13 | #define GPIO_ACTIVE_HIGH 0 |
| 14 | #define GPIO_ACTIVE_LOW 1 |
| 15 | |
| Linus Walleij | 69d301f | 2015-09-24 15:05:45 -0700 | [diff] [blame] | 16 | /* Bit 1 express single-endedness */ |
| 17 | #define GPIO_PUSH_PULL 0 |
| 18 | #define GPIO_SINGLE_ENDED 2 |
| 19 | |
| 20 | /* |
| 21 | * Open Drain/Collector is the combination of single-ended active low, |
| 22 | * Open Source/Emitter is the combination of single-ended active high. |
| 23 | */ |
| 24 | #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_ACTIVE_LOW) |
| 25 | #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_ACTIVE_HIGH) |
| 26 | |
| Stephen Warren | 71fab21 | 2013-02-12 17:22:36 -0700 | [diff] [blame] | 27 | #endif |