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All of the currently known MStar/SigmaStar ARMv7 SoCs have an "xtal" clock input that is usually 24MHz and an "RTC xtal" that is usually 32KHz. The xtal input has to be connected to something so it's enabled by default. The MSC313 and MSC313E do not bring the RTC clock input out to the pins so it's impossible to connect it. The SSC8336 does bring the input out to the pins but it's not always actually connected to something. The RTC node needs to always be present because in the future the nodes for the clock muxes will refer to it even if it's not usable. The RTC node is disabled by default and should be enabled at the board level if the RTC input is wired up. Signed-off-by: Daniel Palmer <daniel@0x0f.com> Link: https://lore.kernel.org/r/20210301123542.2800643-3-daniel@0x0f.com' 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.