dt-bindings: display: msm: dp-controller: document SM8650 compatible

Document the DisplayPort controller found in the Qualcomm SM8650 SoC,
the Controller base addresses and layout differ and thus cannot use
the SM8350 compatible as fallback.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/571131/
Link: https://lore.kernel.org/r/20231207-topic-sm8650-upstream-dp-v1-1-b762c06965bb@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Documentation/devicetree/bindings/display/msm/dp-controller.yaml

@@ -26,6 +26,7 @@ properties:
           - qcom,sc8280xp-edp
           - qcom,sdm845-dp
           - qcom,sm8350-dp
+          - qcom,sm8650-dp
       - items:
           - enum:
               - qcom,sm8250-dp

Documentation/devicetree/bindings/display/msm/qcom,sm8650-mdss.yaml

@@ -41,6 +41,12 @@ patternProperties:
       compatible:
         const: qcom,sm8650-dpu
 
+  "^displayport-controller@[0-9a-f]+$":
+    type: object
+    properties:
+      compatible:
+        const: qcom,sm8650-dp
+
   "^dsi@[0-9a-f]+$":
     type: object
     properties: