gpio: adp5588-gpio: support interrupt controller
Implement irq_chip functionality on ADP5588/5587 GPIO expanders. Only level sensitive interrupts are supported. Interrupts provided by this irq_chip must be requested using request_threaded_irq(). Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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