| commit | 4cbb1513a2d322f858ccb2556715558482fd4850 | |
| author | Dmitriy Sharikhin <d.sharikhin@yadro.com> | |
| Mon, 11 Mar 2024 09:58:31 +0000 (11 09:58 +0000) | ||
| committer | Philippe Mathieu-Daudé <philmd@linaro.org> | |
| Mon, 11 Mar 2024 21:10:18 +0000 (11 22:10 +0100) | ||
| tree | 4739a356a8e634f8a9aa3f73a0acd5ca7dc9ae20 | treesnapshot (tar.gz zip) |
| parent | 2ea09fe85a1a7006133fa8ee1f467a5758e8f8fb | commitdiff |
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>
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>
| MAINTAINERS | diffblobblamehistory | |
| hw/gpio/Kconfig | diffblobblamehistory | |
| hw/gpio/meson.build | diffblobblamehistory | |
| hw/gpio/pcf8574.c | [new file with mode: 0644] | blob |
| include/hw/gpio/pcf8574.h | [new file with mode: 0644] | blob |