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087f8a6b8c
The PCA9670, PCA9671, PCA9672 and PCA9673 all have a RESETN input pin that is used to reset the I2C GPIO expander. One needs to hold this pin low for at least 4us and the reset should be finished after about 100us according to the datasheet[1]. Once the reset is done, the "registers and I2C-bus state machine will be held in their default state until the RESET input is once again HIGH.". Because the logic is reset, the latch values eventually provided in the Device Tree via lines-initial-states property are inapplicable so they are simply ignored if a reset GPIO is provided. [1] https://www.nxp.com/docs/en/data-sheet/PCA9670.pdf 8.5 and fig 22. Tested-by: Heiko Stuebner <heiko@sntech.de> # RK3588 Tiger Haikou Video Demo Reviewed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de> Link: https://lore.kernel.org/r/20250224-pca976x-reset-driver-v3-2-58370ef405be@cherry.de Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.