scsi: ufs: dt-bindings: common: Add OPP table

Except scaling UFS and bus clocks, it's necessary to scale also the
voltages of regulators or power domain performance state levels. Adding
Operating Performance Points table allows to adjust power domain
performance state, depending on the UFS clock speed.

OPPv2 deprecates previous property limited to clock scaling:
freq-table-hz.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Manivannan Sadhasivam <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

Documentation/devicetree/bindings/ufs/ufs-common.yaml

···
       items:
         - description: Minimum frequency for given clock in Hz
         - description: Maximum frequency for given clock in Hz
+    deprecated: true
     description: |
+      Preferred is operating-points-v2.
+
       Array of <min max> operating frequencies in Hz stored in the same order
-      as the clocks property. If this property is not defined or a value in the
-      array is "0" then it is assumed that the frequency is set by the parent
-      clock or a fixed rate clock source.
+      as the clocks property. If either this property or operating-points-v2 is
+      not defined or a value in the array is "0" then it is assumed that the
+      frequency is set by the parent clock or a fixed rate clock source.
+
+  operating-points-v2:
+    description:
+      Preferred over freq-table-hz.
+      If present, each OPP must contain array of frequencies stored in the same
+      order for each clock.  If clock frequency in the array is "0" then it is
+      assumed that the frequency is set by the parent clock or a fixed rate
+      clock source.
+
+  opp-table:
+    type: object
 
   interrupts:
     maxItems: 1
···
 
 dependencies:
   freq-table-hz: [ clocks ]
+  operating-points-v2: [ clocks, clock-names ]
 
 required:
   - interrupts
+
+allOf:
+  - if:
+      required:
+        - freq-table-hz
+    then:
+      properties:
+        operating-points-v2: false
+  - if:
+      required:
+        - operating-points-v2
+    then:
+      properties:
+        freq-table-hz: false
 
 additionalProperties: true