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1762dc01fcOn the OMAPL138, the SPI reference clock is provided by the Power and Sleep Controller (PSC). The PSC's datasheet says that 'some peripherals have special programming requirements and additional recommended steps you must take before you can invoke the PSC module state transition'. I didn't find more details in documentation but it appears that PSC needs the SPI to clear the POWERDOWN bit before disabling the clock. Indeed, when this bit is set, the PSC gets stuck in transitions from enable to disable state. Clear the POWERDOWN bit when releasing driver's resources Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com> Link: https://patch.msgid.link/20240624071745.17409-1-bastien.curutchet@bootlin.com Signed-off-by: Mark Brown <broonie@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 reStructuredText 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.