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590dc51bca
The USB hub has it's reset as GPIO4_IO17 but can be sub-loaded and VBUS provided by a VBUS regulator with GPIO4_IO2 as the enable and GPIO1_IO15 as the active-low over-current. Enable pull-up for GPIO4_IO17 to keep hub out of reset and move VBUS enable to GPIO4_IO2. Additionally enable pull-up on GPIO1_IO15 so that if the hub is loaded it never over-currents. This allows USB to work in both configurations without a device-tree change. Signed-off-by: Tim Harvey <tharvey@gateworks.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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.