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arm64: rockchip: Add driver for the io domain

Description

arm64: rockchip: Add driver for the io domain

This driver configure the registers in the GRF according to the value
of the regulators for the platform.
Some IP can run with either 3.0V or 1.8V, if we don't configure them
correctly according to the external voltage used they will not work.
It's only done at boot time for now and might be needed at runtime for
IP like sdmmc.

Reviewed by: mmel
Tested On: RockPro64, Firefly-RK3399 (gonzo), AIO-3288 (mmel)
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D22854

Details

Provenance
manuAuthored on Dec 28 2019, 3:30 PM
Parents
rGb68dfe6949f4: arm64: rockchip: rk808: Add remaining regulators
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