dt-bindings: PCI: qcom: Allow 'required-opps'

Some Qualcomm SoCs require a minimum performance level for the power
domain so add 'required-opps' to the binding.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>

Author: jhovold

Documentation/devicetree/bindings/pci/qcom,pcie-common.yaml

@@ -59,6 +59,9 @@ properties:
   power-domains:
     maxItems: 1
 
+  required-opps:
+    maxItems: 1
+
   resets:
     minItems: 1
     maxItems: 12

Documentation/devicetree/bindings/pci/qcom,pcie.yaml

@@ -105,6 +105,9 @@ properties:
     description: GPIO controlled connection to PERST# signal
     maxItems: 1
 
+  required-opps:
+    maxItems: 1
+
   wake-gpios:
     description: GPIO controlled connection to WAKE# signal
     maxItems: 1