| 1 | /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */ |
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| 2 | /* |
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| 3 | * This header provides constants for most GPIO bindings. |
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| 4 | * |
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| 5 | * Most GPIO bindings include a flags cell as part of the GPIO specifier. |
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| 6 | * In most cases, the format of the flags cell uses the standard values |
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| 7 | * defined in this header. |
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| 8 | */ |
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| 9 | |
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| 10 | #ifndef _DT_BINDINGS_GPIO_GPIO_H |
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| 11 | #define _DT_BINDINGS_GPIO_GPIO_H |
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| 12 | |
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| 13 | /* Bit 0 express polarity */ |
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| 14 | #define GPIO_ACTIVE_HIGH 0 |
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| 15 | #define GPIO_ACTIVE_LOW 1 |
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| 16 | |
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| 17 | /* Bit 1 express single-endedness */ |
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| 18 | #define GPIO_PUSH_PULL 0 |
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| 19 | #define GPIO_SINGLE_ENDED 2 |
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| 20 | |
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| 21 | /* Bit 2 express Open drain or open source */ |
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| 22 | #define GPIO_LINE_OPEN_SOURCE 0 |
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| 23 | #define GPIO_LINE_OPEN_DRAIN 4 |
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| 24 | |
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| 25 | /* |
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| 26 | * Open Drain/Collector is the combination of single-ended open drain interface. |
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| 27 | * Open Source/Emitter is the combination of single-ended open source interface. |
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| 28 | */ |
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| 29 | #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN) |
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| 30 | #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE) |
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| 31 | |
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| 32 | /* Bit 3 express GPIO suspend/resume and reset persistence */ |
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| 33 | #define GPIO_PERSISTENT 0 |
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| 34 | #define GPIO_TRANSITORY 8 |
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| 35 | |
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| 36 | /* Bit 4 express pull up */ |
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| 37 | #define GPIO_PULL_UP 16 |
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| 38 | |
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| 39 | /* Bit 5 express pull down */ |
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| 40 | #define GPIO_PULL_DOWN 32 |
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| 41 | |
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| 42 | /* Bit 6 express pull disable */ |
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| 43 | #define GPIO_PULL_DISABLE 64 |
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| 44 | |
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| 45 | #endif |
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| 46 | |
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