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On the R40, in addition to a mux between the RTC's own RC oscillator and an external 32768 Hz crystal, which are muxed inside the RTC module, the CCU also has its own RC oscillator, which runs at around 2 MHz, and can be muxed with the LOSC output from the RTC. This muxed output is called "SYS 32K" in the module clock diagram, but otherwise referred to as the LOSC throughout the CCU documentation. The RC oscillator is not very accurate, even though it has an undocumented calibration function. We really want a precise clock at 32768 Hz, instead of something at around 32 KHz. This patch forces the SYS 32K clock to use the RTC output as its parent, and doesn't bother registering the internal oscillator nor a clock mux. Acked-by: Maxime Ripard <maxime.ripard@bootlin.com> Acked-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Chen-Yu Tsai <wens@csie.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.