4cbb1513a2
NXP PCF8574 and compatible ICs are simple I2C GPIO expanders. PCF8574 incorporates quasi-bidirectional IO, and simple communication protocol, when IO read is I2C byte read, and IO write is I2C byte write. User can think of it as open-drain port, when line high state is input and line low state is output. Signed-off-by: Dmitrii Sharikhin <d.sharikhin@yadro.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-ID: <f1552d822276e878d84c01eba2cf2c7c9ebdde00.camel@yadro.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
16 lines
313 B
C
16 lines
313 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* NXP PCF8574 8-port I2C GPIO expansion chip.
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*
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* Copyright (c) 2024 KNS Group (YADRO).
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* Written by Dmitrii Sharikhin <d.sharikhin@yadro.com>
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*/
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#ifndef _HW_GPIO_PCF8574
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#define _HW_GPIO_PCF8574
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#define TYPE_PCF8574 "pcf8574"
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#endif /* _HW_GPIO_PCF8574 */
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