OPP: Allow power/current values without voltage

Hello,

Some platforms, such as Apple Silicon, do not describe their device's voltage regulators in the DT as they cannot be controlled by the kernel and/or rely on opaque firmware algorithms to control their voltage and current characteristics at runtime. They can, however, experimentally determine the power consumption of a given device at a given OPP, taking advantage of opp-microwatt to provide EAS on such devices as was initially intended.

But the OPP core currently doesn't parse the opp-microwatt property if opp-microvolt isn't present. This patch series targets to change this approach.

This first fixes few mistakes in the DT bindings, followed by code reorganization. And the last commit, from James, fixes the problem at hand.

I have tested all combinations on my Hikey board, hope it doesn't break anything.

James Calligeros (1):
OPP: decouple dt properties in opp_parse_supplies()

Viresh Kumar (4):
dt-bindings: opp: Fix usage of current in microwatt property
dt-bindings: opp: Fix named microwatt property
OPP: Parse named opp-microwatt property too
OPP: Simplify opp_parse_supplies() by restructuring it

 .../devicetree/bindings/opp/opp-v2-base.yaml  |   6 +-
 drivers/opp/of.c                              | 228 ++++++++----------
 2 files changed, 102 insertions(+), 132 deletions(-)

2.31.1.272.g89b43f80a514