A GPIO (general-purpose I/O) device looks like the most boring sort of peripheral that a computer might offer. It is a single electrical signal that the CPU can either set to one of two values — zero ...
Cc: David Brownell <dbrownell@users.sourceforge.net>, Andrew Morton <akpm@linux-foundation.org>, linux-arm-kernel@lists.arm.linux.org.uk, Russell King - ARM Linux ...
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