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The OSM spec defines dedicated functions for all pads of the SoM. Therefore we can assume that carrier board designs stick to these definitions and extend the SoM devicetree include with matching default nodes and pinmux settings. This way we can reduce the overhead and redundancy in the carrier board devicetrees while still sticking to the policy of separating board and module description. Even if the carrier board design deviates slightly from the spec it can define its own pinmux definitions and use them as necessary or even disable unused nodes from the SoM devicetree. Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de> Signed-off-by: Shawn Guo <shawnguo@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 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.