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Add a combined pinctrl and GPIO driver for the JH7100 RISC-V SoC by StarFive Ltd. This is a test chip for their upcoming JH7110 SoC, which is said to feature only minor changes to these pinctrl/GPIO parts. For each "GPIO" there are two registers for configuring the output and output enable signals which may come from other peripherals. Among these are two special signals that are constant 0 and constant 1 respectively. Controlling the GPIOs from software is done by choosing one of these signals. In other words the same registers are used for both pin muxing and controlling the GPIOs, which makes it easier to combine the pinctrl and GPIO driver in one. I wrote the pinconf and pinmux parts, but the GPIO part of the code is based on the GPIO driver in the vendor tree written by Huan Feng with cleanups and fixes by Drew and me. Datasheet: https://github.com/starfive-tech/JH7100_Docs/blob/main/JH7100%20Data%20Sheet%20V01.01.04-EN%20(4-21-2021).pdf Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Co-developed-by: Huan Feng <huan.feng@starfivetech.com> Signed-off-by: Huan Feng <huan.feng@starfivetech.com> Co-developed-by: Drew Fustini <drew@beagleboard.org> Signed-off-by: Drew Fustini <drew@beagleboard.org> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
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.