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Certain firmware configurations "protect" clks and cause the entire system to reboot when a non-secure OS such as Linux tries to read or write protected clk registers. But other firmware configurations allow reading or writing the same registers, and they may actually require that the OS use the otherwise locked down clks. Support the 'protected-clocks' property by never registering these protected clks with the common clk framework. This way, when firmware is protecting these clks we won't have the chance to ever read or write these registers and take down the entire system. Cc: Taniya Das <tdas@codeaurora.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Stephen Boyd <sboyd@kernel.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.