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Some i.MX SoCs (e.g. MX8QXP and MX8QM) contain a system controller that is responsible for controlling the pad setting of the IPs that are present. Communication between the host processor running an OS and the system controller happens through a SCU protocol. This patch classifies the pad settings into two categories: MMIO and SCU. For the original MMIO method, no functional changes except organize them into a few imx_*_mmio() functions. Besides that, we add the SCU based Pad Mux and Pinconf setting support which are implemented in pinctrl-scu.c. Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Fabio Estevam <festevam@gmail.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.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.