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Merge series from Chancel Liu <chancel.liu@nxp.com>: At a previous time, we have successfully created a virtual sound card based on rpmsg. The sound card works under this mechanism Cortex-A core tells the Cortex-M core the format, rate, channel, .etc configuration of the PCM parameters and Cortex-M controls real hardware devices such as SAI and DMA. From the view of Linux side, the sound card is bound to a rpmsg channel through which it can access SAI. Here these patches are introduced to create a new virtual sound card to access MICFIL based on a new created rpmsg channel. It's easy to create a new rpmsg channel for MICFIL through rpmsg name service announcment. Also the other ASoC components bound to this rpmsg MICFIL sound card will be registered with these patches. If other sound cards using different hardware devices needs to be created over rpmsg in the future, these patches can be referred.
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.