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When updating the GPIO registers, do nothing for all fields of gpio_cfg that are "0xFFFF". This "do nothing" flag used to be 0 to easily check whether the gpio_cfg field was actually set inside pdata or left empty (default). However, 0 is a valid configuration for these registers, while 0xFFFF is not. With this change, users can explicitly set them to 0. Not setting gpio_cfg in the platform data will now lead to setting all GPIO registers to 0 instead of leaving them unset. No one is using this platform data with this codec. The change gets the driver ready to properly set gpio_cfg from the DT. Datasheet: https://statics.cirrus.com/pubs/proDatasheet/WM8904_Rev4.1.pdf Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@toradex.com> Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com> Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://patch.msgid.link/20250319142059.46692-3-francesco@dolcini.it Signed-off-by: Mark Brown <broonie@kernel.org>
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.