c1e802f68c
This patch adds the gpio-ranges and gpio-reserved-ranges property definitions to the binding text files supported by the pinctrl-msm driver framework. gpio-ranges: For DT-based platforms the pinctrl-msm framework currently relies on the deprecated-for-DT gpiochip_add_pin_range() function to add the range of GPIOs to be handled by the pin controller. Due to interactions within gpiolib code, this causes the pinctrl-msm driver to bail out (-517) during boot when a gpio-hog is declared. This can be fatal and cause the system to not boot or reset (for a detailed explanation and call-trace, refer to patch: "pinctrl: msm: fix gpio-hog related boot issues" in this series). gpio-reserved-ranges: The binding has been added as a precaution since the TrustZone firmware (aka QSEE), which is running as the hypervisor, might have reserved certain, but undisclosed pins. Hence reading or writing to the registers for those pins will cause an XPU violation and this subsequently crashes the kernel. Signed-off-by: Christian Lamparter <chunkeey@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.