regulator: dt-bindings: qcom,sdm845-refgen-regulator: Document IPQ9650

IPQ9650 has two REFGEN blocks which provide reference current to the PCIe,
USB and UNIPHY PHYs. Unlike other supported platforms, IPQ9650 requires the
REFGEN clocks to be enabled explicitly.

Document the IPQ9650 compatible and the required clocks for it.

While at it, move the allOf block after the 'required' property section.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.qualcomm.com>
Link: https://patch.msgid.link/20260617-ipq9650_refgen-v4-2-c505ea6c6661@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/qcom,sdm845-refgen-regulator.yaml

@@ -13,9 +13,6 @@ description:
   The REFGEN (reference voltage generator) regulator provides reference
   voltage for on-chip IPs (like PHYs) on some Qualcomm SoCs.
 
-allOf:
-  - $ref: regulator.yaml#
-
 properties:
   compatible:
     oneOf:
@@ -39,16 +36,44 @@ properties:
           - const: qcom,sm8250-refgen-regulator
 
       - enum:
+          - qcom,ipq9650-refgen-regulator
           - qcom,sdm845-refgen-regulator
           - qcom,sm8250-refgen-regulator
 
   reg:
     maxItems: 1
 
+  clocks:
+    items:
+      - description: Core reference clock
+      - description: AHB interface clock
+
+  clock-names:
+    items:
+      - const: core
+      - const: hclk
+
 required:
   - compatible
   - reg
 
+allOf:
+  - $ref: regulator.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,ipq9650-refgen-regulator
+    then:
+      required:
+        - clocks
+        - clock-names
+    else:
+      properties:
+        clocks: false
+        clock-names: false
+
 unevaluatedProperties: false
 
 examples: