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Add support for selecting the voltage reference from the devicetree. This change is required to get valid readings with all three vref hardware configurations supported by the ADC. For instance if the ADC isn't provided with an external reference, the sample request must specify an internal voltage reference to get a valid reading. Signed-off-by: Liam Beguin <lvb@xiphos.com> Link: https://lore.kernel.org/r/20210815213309.2847711-4-liambeguin@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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.