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42 lines
1.1 KiB
42 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* This header provides constants for most GPIO bindings. |
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* |
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* Most GPIO bindings include a flags cell as part of the GPIO specifier. |
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* In most cases, the format of the flags cell uses the standard values |
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* defined in this header. |
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*/ |
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#ifndef _DT_BINDINGS_GPIO_GPIO_H |
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#define _DT_BINDINGS_GPIO_GPIO_H |
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/* Bit 0 express polarity */ |
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#define GPIO_ACTIVE_HIGH 0 |
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#define GPIO_ACTIVE_LOW 1 |
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/* Bit 1 express single-endedness */ |
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#define GPIO_PUSH_PULL 0 |
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#define GPIO_SINGLE_ENDED 2 |
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/* Bit 2 express Open drain or open source */ |
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#define GPIO_LINE_OPEN_SOURCE 0 |
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#define GPIO_LINE_OPEN_DRAIN 4 |
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/* |
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* Open Drain/Collector is the combination of single-ended open drain interface. |
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* Open Source/Emitter is the combination of single-ended open source interface. |
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*/ |
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#define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN) |
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#define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE) |
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/* Bit 3 express GPIO suspend/resume and reset persistence */ |
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#define GPIO_PERSISTENT 0 |
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#define GPIO_TRANSITORY 8 |
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/* Bit 4 express pull up */ |
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#define GPIO_PULL_UP 16 |
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/* Bit 5 express pull down */ |
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#define GPIO_PULL_DOWN 32 |
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#endif
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