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When setting a new voltage the voltage boundaries are read every time to check that the new voltage is within the proper range. Checking these voltage boundaries consists of reading one of PMBUS_MFR_VOUT_MIN/ PMBUS_VOUT_MARGIN_LOW registers and then PMBUS_MFR_VOUT_MAX/ PMBUS_VOUT_MARGIN_HIGH together with writing the PMBUS_CLEAR_FAULTS register. Since these boundaries are never being changed, it can be cached and thus saving unnecessary smbus transmissions. Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com> Link: https://lore.kernel.org/r/20220614093856.3470672-2-marten.lindahl@axis.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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.