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The MT8195 SoC has four USB controllers: only one is a direct path to a XHCI controller, while the other three (0, 2 and 3) are behind the MTU3 DRD controller instead! Add the missing MTU3 nodes, default disabled, for controllers 0, 2 and 3 and move the related XHCI nodes to be children of their MTU3 DRD to correctly describe the SoC. In order to retain USB functionality on all of the MT8195 and MT8395 boards, also move the vusb33 supply and enable the relevant MTU3 nodes with special attention to the MT8195 Cherry Chromebook, where it was necessary to set the dr_mode of all MTU3 controllers to host to avoid interfering with the EC performing DRD on its own. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Link: https://lore.kernel.org/r/20240115084336.938426-1-angelogioacchino.delregno@collabora.com Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.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.