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be36abb71d
This GPIO controller can serve as an interrupt controller as well on the GPIOs it handles. An interrupt is generated whenever a GPIO line changes and the interrupt for this GPIO line is enabled. This means that both the changes from low to high and high to low generate an interrupt. For some use cases, it makes sense to ignore the high to low change and not generate an interrupt. Such a use case is a line that is hold in a level high/low manner until the event holding the line gets acked. This can be achieved by making sure the interrupt on the GPIO controller side gets acked and masked only after the line gets hold in its default state, this is what's done with the fasteoi functions. Only IRQ_TYPE_EDGE_BOTH and IRQ_TYPE_LEVEL_HIGH are supported for now. Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
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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.