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While there are surely some arguments in favor of integrating the GPIO and pinctrl subsystems into one, I believe this is not the right approach. The GPIO subsystem uses intricate locking with SRCU to handle the fact that both consumers and providers may run in different contexts. Pin-controller drivers are always meant to run in process context. This alone is a huge obstacle to any attempt at integration as evident by many problems we already encountered during the hotplug rework. The current glue code is pretty minimal and for most part already allows GPIO controllers to query pinctrl about the information they need. I suggest to drop this task and keep the subsystems separate even if many pin-controllers implement GPIO functionality in addition to pin functions. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20250321-gpio-todo-updates-v1-3-7b38f07110ee@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
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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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.