c6807970c3
Add driver support for the UART routing control. Users can perform runtime configuration of the RX muxes among the UART controllers and the UART IO pins. The sysfs interface is also exported for the convenience of routing paths check and update. Signed-off-by: Oskar Senft <osk@google.com> Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Tested-by: Lei YU <yulei.sh@bytedance.com> Link: https://lore.kernel.org/r/20210927023053.6728-5-chiawei_wang@aspeedtech.com Link: https://lore.kernel.org/r/20211022000616.481772-1-joel@jms.id.au' Signed-off-by: Arnd Bergmann <arnd@arndb.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.