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37d61885ac
The VAR SOM symphony carrier board can be used with SOMs which have a soldered ethernet PHY onboard and with SOMs which don't have one. For SOMs with an onboard PHY, the PHY on the cartrier board is not used, and GPIO1_IO9 is used as a reset line to the onboard PHY. For SOMs without an onboard PHY, the PHY on the carrier board is used. For this configuration, pca9534 GPIO 5 (located on the carrier board) is used as a reset line to the PHY, and GPIO1_IO9 is not used. GPIO1_IO9 is not connected to any user-accessible pins or functions, and leaving it enabled in the mux pinctrl for both configurations is safe. Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> 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.