dt-bindings: opp: Add "opp-microwatt" entry in the OPP

Add new entry for the OPP which provides information about power
expressed in micro-Watts. It is useful for the Energy Model framework.
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Documentation/devicetree/bindings/opp/opp-v2-base.yaml

@@ -93,6 +93,21 @@ patternProperties:
         minItems: 1
         maxItems: 8   # Should be enough regulators
 
+      opp-microwatt:
+        description: |
+          The power for the OPP in micro-Watts.
+
+          Entries for multiple regulators shall be provided in the same field
+          separated by angular brackets <>. If current values aren't required
+          for a regulator, then it shall be filled with 0. If power values
+          aren't required for any of the regulators, then this field is not
+          required. The OPP binding doesn't provide any provisions to relate the
+          values to their power supplies or the order in which the supplies need
+          to be configured and that is left for the implementation specific
+          binding.
+        minItems: 1
+        maxItems: 8   # Should be enough regulators
+
       opp-level:
         description:
           A value representing the performance level of the device.
@@ -203,6 +218,14 @@ patternProperties:
         minItems: 1
         maxItems: 8   # Should be enough regulators
 
+      '^opp-microwatt':
+        description:
+          Named opp-microwatt property. Similar to opp-microamp property,
+          but for microwatt instead.
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        minItems: 1
+        maxItems: 8   # Should be enough regulators
+
     dependencies:
       opp-avg-kBps: [ opp-peak-kBps ]