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The rcar_sound port nodes have unit names and thus should have register properties. This is flagged by dtc as follows: # make dtbs W=1 ... DTC arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dtb arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dtb: Warning (unit_address_vs_reg): /soc/sound@ec500000/ports/port@0: node has a unit name, but no reg property DTC arch/arm64/boot/dts/renesas/r8a77965-salvator-xs.dtb arch/arm64/boot/dts/renesas/r8a77965-salvator-xs.dtb: Warning (unit_address_vs_reg): /soc/sound@ec500000/ports/port@0: node has a unit name, but no reg property Prior to this patch the port nodes only defined in board DTS files. As the register properties are common this patch defines the port nodes and provides register properties in the SoC DTS file. Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.