Andrew Turner 1fc1a22868 Add a GPIO driver for the Arm pl061 controller
A PL061 is a simple 8 pin GPIO controller. This GPIO device is used to
signal an internal request for shutdown on some virtual machines including
Arm-based Amazon EC2 instances.

Submitted by:	Ali Saidi <alisaidi_amazon.com> (previouss version)
Reviewed by:	Ali Saidi, manu
Differential Revision:	https://reviews.freebsd.org/D24065
2020-09-08 11:35:35 +00:00
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