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323b8d0ddb
Changes gpio.h DT binding header file to be published under GPLv2 or BSD-2-Clause license terms. This change allows this GPIO generic bindings header file to be used in software components as bootloaders and OSes that are not published under GPLv2 terms. All contributors to gpio.h file in copy. Cc: Stephen Warren <swarren@nvidia.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Laxman Dewangan <ldewangan@nvidia.com> Cc: Andrew Jeffery <andrew@aj.id.au> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Cc: Nuno Sá <nuno.sa@analog.com> Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org> Acked-by: Nuno Sá <nuno.sa@analog.com> Acked-by: Andrew Jeffery <andrew@aj.id.au> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20220905145555.674800-1-etienne.carriere@linaro.org Signed-off-by: Rob Herring <robh@kernel.org>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
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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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/* Bit 6 express pull disable */
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#define GPIO_PULL_DISABLE 64
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#endif
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