To enable DVFS, DRAM driver needs to access four different
regulators that SoC can't access directly and need board-specific
implementations.
To support that we need to define the getter and setter APIs for
those regulators.
BUG=b:147789962
BRANCH=none
TEST=verified with DRAM driver
Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Change-Id: I0c2d471a7f8628735af90c5b5a5ab3012831e442
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46405
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
cbbdcb330d