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Add a platform-independent driver framework for Intel GPIO pin controllers
found on modern Intel SoCs. The driver accesses GPIO pad registers through
ACPI-provided memory-mapped resources and implements the gpio interface [1]
including pin enumeration, capability reporting, configuration, and
read/write/toggle operations. A common data model of communities and pad groups
allows individual SoC-specific drivers to supply their own pad tables and ACPI
hardware IDs while sharing all register-level logic.
[1] https://wiki.freebsd.org/GPIO
Reviewed by: vexeduxr
MFC after: 1 week
Sponsored by: Beckhoff Automation GmbH & Co. KG
Pull Request: https://github.com/freebsd/freebsd-src/pull/2205
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