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After adding a pinctrl flag to gpio-mmio we can use it for driving gpio-vf610. The existing code has the same semantics and the generic gpio-mmio, including reading from the data out register when the direction is set to input, and it can also handle the absence of the direction register better than the current driver: we get the direction from the shadow direction registers in gpio-mmio instead. Since gpio-mmio has an internal spinlock we can drop the direction-protecting spinlock from the driver. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Haibo Chen <haibo.chen@nxp.com> Tested-by: Haibo Chen <haibo.chen@nxp.com> Link: https://lore.kernel.org/r/20250219-vf610-mmio-v3-2-588b64f0b689@linaro.org Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@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 reStructuredText 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.