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In order to prevent confusing problems where pin configuration is not be applied, an upcoming change to the overlaycheck utility will add a check that all added pin groups are in some way referenced by the overlay. Before that can be done, it is necessary to ensure that all existing overlays pass that test. This patch modifies some overlays by adding the required "pinctrl-0" properties, but for others that are just setting GPIOs to inputs and outputs, where those same GPIOs are declared by <name>-gpios properties, it is better to drop the pin groups and let the GPIO subsystem set up the GPIOs as required. Removing this duplication may be helpful in the future should we ever decide to enable the exclusive GPIO vs pinctrl locking (.strict in struct pinmux_ops). See: https://forums.raspberrypi.com/viewtopic.php?t=393742 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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 Restructured Text 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.
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