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When the MFG PLL clock, which is upstream of the MFG clock, is changed, the downstream clock and consumers need to be switched away from the PLL over to a stable clock to avoid glitches. This is done through the use of the newly added clk mux notifier. The notifier is set on the mux itself instead of the upstream PLL, but in practice this works, as the rate change notifitcations are propogated throughout the sub-tree hanging off the PLL. Just before rate changes, the MFG mux is temporarily and transparently switched to the 26 MHz main crystal. After the rate change, the mux is switched back. Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> [Angelo: Rebased to assign clk_ops in mtk_mux_nb] Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Miles Chen <miles.chen@mediatek.com> Link: https://lore.kernel.org/r/20220927101128.44758-5-angelogioacchino.delregno@collabora.com Signed-off-by: Chen-Yu Tsai <wenst@chromium.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.