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When the interrupt line is shared with other devices, the IRQ must be level-triggered, as only one device can trigger a falling edge. To support this, try to acquire the IRQ with IRQF_TRIGGER_LOW|IRQF_SHARED first. Interrupt controllers that lack support for level-triggers will return an error, in which case the driver will now retry the acqusition with IRQF_TRIGGER_FALLING, which was also the default before. Signed-off-by: Daniel Mack <daniel@zonque.org> Link: https://lore.kernel.org/r/20200521091152.404404-6-daniel@zonque.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.