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The USB PHY clock can be configured as (grand) parent of uart0_sclk and sclk_gpu. It has been observed that UART0 doesn't work reliably in high speed mode with the PHY clock as input when certain USB devices are plugged to the USB HOST1 port (see https://crrev.com/c/320543). Prefix the name of the PHY clock with a '.' in the non-USB muxes to effectively remove the clock as input from these muxes. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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.