diff options
| author | Dmitriy Sharikhin <d.sharikhin@yadro.com> | 2024-03-11 09:58:31 +0000 |
|---|---|---|
| committer | Philippe Mathieu-Daudé <philmd@linaro.org> | 2024-03-11 22:10:18 +0100 |
| commit | 4cbb1513a2d322f858ccb2556715558482fd4850 (patch) | |
| tree | 4739a356a8e634f8a9aa3f73a0acd5ca7dc9ae20 /include/hw/gpio | |
| parent | 2ea09fe85a1a7006133fa8ee1f467a5758e8f8fb (diff) | |
hw/gpio: introduce pcf8574 driver
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>
Diffstat (limited to 'include/hw/gpio')
| -rw-r--r-- | include/hw/gpio/pcf8574.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/hw/gpio/pcf8574.h b/include/hw/gpio/pcf8574.h new file mode 100644 index 0000000000..3291d7dbbc --- /dev/null +++ b/include/hw/gpio/pcf8574.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +/* + * NXP PCF8574 8-port I2C GPIO expansion chip. + * + * Copyright (c) 2024 KNS Group (YADRO). + * Written by Dmitrii Sharikhin <d.sharikhin@yadro.com> + */ + +#ifndef _HW_GPIO_PCF8574 +#define _HW_GPIO_PCF8574 + +#define TYPE_PCF8574 "pcf8574" + +#endif /* _HW_GPIO_PCF8574 */ |