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a060b8c511
This module scans the device tree (for now only OF nodes are supported but care is taken to make other fwnode implementations easy to integrate) and determines which GPIO lines are shared by multiple users. It stores that information in memory. When the GPIO chip exposing shared lines is registered, the shared GPIO descriptors it exposes are marked as shared and virtual "proxy" devices that mediate access to the shared lines are created. When a consumer of a shared GPIO looks it up, its fwnode lookup is redirected to a just-in-time machine lookup that points to this proxy device. This code can be compiled out on platforms which don't use shared GPIOs. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20251112-gpio-shared-v4-3-b51f97b1abd8@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.