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The interrupt-related register fields on the MAX77620 GPIO controller share registers with GPIO related fields. If the IRQ chip is implemented with regmap-irq, this causes the IRQ controller code to overwrite fields previously configured by the GPIO controller code. Two examples where this causes problems are the NVIDIA Jetson TX1 and Jetson TX2 boards, where some of the GPIOs are used to enable vital power regulators. The MAX77620 GPIO controller also provides the USB OTG ID pin. If configured as an interrupt, this causes some of the regulators to be powered off. Signed-off-by: Timo Alho <talho@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20191002122825.3948322-3-thierry.reding@gmail.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.