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Add a GPIO driver for the Raspberry Pi firmware GPIOs

Description

Add a GPIO driver for the Raspberry Pi firmware GPIOs

These exist on the Raspberry Pi 3 and 4 and control and external IO
expander.

Reviewed by: manu
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D25858

Details

Provenance
andrewAuthored on
Reviewer
manu
Differential Revision
D25858: Add a GPIO driver for the Raspberry Pi firmware GPIOs
Parents
rS363801: Provide more correct description for sysctl kern.smp.cores.
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