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[ Upstream commit 9011f92622e5ef2d075f45e5fa818776d4feb8c0 ] Sometimes clk drivers are attached to devices which are children of a parent device that is connected to a node in DT. This happens when devices are MFD-ish and the parent device driver mostly registers child devices to match against drivers placed in their respective subsystem directories like drivers/clk, drivers/regulator, etc. When the clk driver calls clk_register() with a device pointer, that struct device pointer won't have a device_node associated with it because it was created purely in software as a way to partition logic to a subsystem. This causes problems for the way we find parent clks for the clks registered by these child devices because we look at the registering device's device_node pointer to lookup 'clocks' and 'clock-names' properties. Let's use the parent device's device_node pointer if the registering device doesn't have a device_node but the parent does. This simplifies clk registration code by avoiding the need to assign some device_node to the device registering the clk. Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Reported-by: Niklas Cassel <niklas.cassel@linaro.org> Signed-off-by: Stephen Boyd <sboyd@kernel.org> Link: https://lkml.kernel.org/r/20191230190455.141339-1-sboyd@kernel.org [sboyd@kernel.org: Fixup kernel-doc notation] Reviewed-by: Niklas Cassel <nks@flawful.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Sasha Levin <sashal@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.