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329db102a2
Newer versions of the PWM block use a core clock with external mux, divider, and gate. These components either don't exist any longer in the PWM block, or they are bypassed. To minimize needed changes for supporting the new version, the internal divider and gate should be handled by CCF too. I didn't see a good way to split the patch, therefore it's somewhat bigger. What it does: - The internal mux is handled by CCF already. Register also internal divider and gate with CCF, so that we have one representation of the input clock: [mux] parent of [divider] parent of [gate] - Now that CCF selects an appropriate mux parent, we don't need the DT-provided default parent any longer. Accordingly we can also omit setting the mux parent directly in the driver. - Instead of manually handling the pre-div divider value, let CCF set the input clock. Targeted input clock frequency is 0xffff * 1/period for best precision. - For the "inverted pwm disabled" scenario target an input clock frequency of ULONG_MAX. This ensures that the remaining low pulses have minimum length. I don't have hw with the old PWM block, therefore I couldn't test this patch. With the not yet included extension for the new PWM block (channel->clk coming directly from get_clk(external_clk)) I didn't notice any problem. My system uses PWM for the CPU voltage regulator and for the SDIO 32kHz clock. Note: The clock gate in the old PWM block is permanently disabled. This seems to indicate that it's not used by the new PWM block. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> |
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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.