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The NanoPi R2S has a Realtek RTL8153B USB 3.0 Ethernet chip connected to the USB 3.0 pins of the RK3328 SoC. Power to the chip is controlled by a GPIO line toggled transistor switch, which is not a full-blown voltage regulator. At least in Linux, the USB 3.0 XHCI controller has two ports: the first port is for legacy USB 2.0 and slower, while the second port is for USB 3.0. Since the Ethernet chip supports USB 3.0, it should be described as connected to the second port. Add the device nodes for the power switch and Ethernet chip, and enable the USB 3.0 controller. The USB device node follows the standard USB device binding. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Link: https://lore.kernel.org/r/20210504083616.9654-5-wens@kernel.org Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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.