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Formerly, if configured using DT, CS GPIOs were driven from spi.c and it was possible for CS to be asserted (low) *before* starting to drive SCK. CS GPIOs have been brought under control of this driver in both ACPI and DT cases, with a fixup for GPIO polarity. Signed-off-by: Nick Hollinghurst <nick.hollinghurst@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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