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6752fef5c3
MUST: after pm_runtime_enable step, any register R/W should be wrapped with pm_runtime_get_sync/put. Another approach is to enable the regcache true to avoid access HW registers. Alternatively, performing the registers R/W before pm_runtime_enable is also a good option. Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com> Change-Id: I69dd66230cba636d2ccb31ec01a21be1a482a0e3
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.