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For dividers with zero indicating clock is disabled, instead of giving a warning each time like "clkx: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set" in exist code, we'd like to introduce enable/disable function for it. e.g. 000b - Clock disabled 001b - Divide by 1 010b - Divide by 2 ... Set rate when the clk is disabled will cache the rate request and only when the clk is enabled will the driver actually program the hardware to have the requested divider value. Similarly, when the clk is disabled we'll write a 0 there, but when the clk is enabled we'll restore whatever rate (divider) was chosen last. It does mean that recalc rate will be sort of odd, because when the clk is off it will return 0, and when the clk is on it will return the right rate. So to make things work, we'll need to return the cached rate in recalc rate when the clk is off and read the hardware when the clk is on. NOTE for the default off divider, the recalc rate will still return 0 as there's still no proper preset rate. Enable such divider will give user a reminder error message. Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> [sboyd@kernel.org: Include clk.h for sparse warnings] Signed-off-by: Stephen Boyd <sboyd@kernel.org> |
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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.