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The Bananapi-M3 has a SATA connector, driven by a USB-to-SATA bridge soldered on the board. The power for the SATA device is provided by a GPIO controlled regulator. Since the SATA device is behind USB, it has no DT node, so we never described this regulator. Instead U-Boot was turning this on in a rather hackish way, which we now want to get rid of. On top of that it seems fragile to leave this GPIO undescribed, as userland could claim it and turn the disk off. Add a fixed regulator, controlled by the PD25 GPIO, and mark it as always-on. This would mimic the current situation, but in a safer way, and would allow U-Boot to drop the CONFIG_SATAPWR enable hack. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Acked-by: Samuel Holland <samuel@sholland.org> Link: https://lore.kernel.org/r/20230120012616.30960-1-andre.przywara@arm.com Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.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.