regulator: dt-bindings: qcom,qca6390-pmu: Document WCN6755 PMU

Document the WCN6755 PMU using a fallback to WCN6750 since the two chips
seem to be completely pin and software compatible. In fact the original
downstream kernel just pretends the WCN6755 is a WCN6750.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260403-milos-fp6-bt-wifi-v2-1-393322b27c5f@fairphone.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: lweiss-fairphone

Documentation/devicetree/bindings/regulator/qcom,qca6390-pmu.yaml

@@ -16,11 +16,17 @@ description:
 
 properties:
   compatible:
-    enum:
-      - qcom,qca6390-pmu
-      - qcom,wcn6750-pmu
-      - qcom,wcn6855-pmu
-      - qcom,wcn7850-pmu
+    oneOf:
+      - items:
+          - enum:
+              - qcom,wcn6755-pmu
+          - const: qcom,wcn6750-pmu
+
+      - enum:
+          - qcom,qca6390-pmu
+          - qcom,wcn6750-pmu
+          - qcom,wcn6855-pmu
+          - qcom,wcn7850-pmu
 
   vdd-supply:
     description: VDD supply regulator handle