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Merge series from Charles Keepax <ckeepax@opensource.cirrus.com>: The MIPI SoundWire Device Class for Audio (SDCA) specification defines most details of the hardware in ACPI using the MIPI Discovery and Configuration (DisCo) specification. This patch chain adds support for parsing most of this information into the kernel such that future work can make use of it to construct CODEC devices and soundcards. The most notable outstanding work here, is parsing the separate properties for the Control Numbers (roughly equivalent to channels) within an individual Control. The separate Control Numbers are supported but currently only the scheme were a single default etc. is supplied for all. This should not be super hard to add in the future but isn't currently required by any of the hardware I am working to support.
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.