dt-bindings: interconnect: qcom,rpmh: Add SM8250 QUP virt

Document the QUP virtual bus on SM8250.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230703-topic-8250_qup_icc-v2-1-9ba0a9460be2@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>

Documentation/devicetree/bindings/interconnect/qcom,rpmh.yaml

@@ -18,9 +18,6 @@ description: |
    least one RPMh device child node pertaining to their RSC and each provider
    can map to multiple RPMh resources.
 
-allOf:
-  - $ref: qcom,rpmh-common.yaml#
-
 properties:
   reg:
     maxItems: 1
@@ -91,6 +88,7 @@ properties:
       - qcom,sm8250-mc-virt
       - qcom,sm8250-mmss-noc
       - qcom,sm8250-npu-noc
+      - qcom,sm8250-qup-virt
       - qcom,sm8250-system-noc
       - qcom,sm8350-aggre1-noc
       - qcom,sm8350-aggre2-noc
@@ -107,7 +105,19 @@ properties:
 
 required:
   - compatible
-  - reg
+
+allOf:
+  - $ref: qcom,rpmh-common.yaml#
+  - if:
+      not:
+        properties:
+          compatible:
+            enum:
+              - qcom,sm8250-qup-virt
+    then:
+      required:
+        - reg
+
 
 unevaluatedProperties: false