The 'display-controller' child (DPU) of Display SubSystem (MDSS) uses
opp-table, so reference it which allows restricting DPU schema to fixed
list of properties.

Fixes: 57fd4f34ddac ("dt-bindings: msm: add DT bindings for sc7280")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
---
 Documentation/devicetree/bindings/display/msm/dpu-sc7280.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/msm/dpu-sc7280.yaml b/Documentation/devicetree/bindings/display/msm/dpu-sc7280.yaml
index f427eec3d3a4..5a4bec99b98a 100644
--- a/Documentation/devicetree/bindings/display/msm/dpu-sc7280.yaml
+++ b/Documentation/devicetree/bindings/display/msm/dpu-sc7280.yaml
@@ -72,6 +72,7 @@ patternProperties:
   "^display-controller@[0-9a-f]+$":
     type: object
     description: Node containing the properties of DPU.
+    additionalProperties: false
 
     properties:
       compatible:
@@ -112,6 +113,7 @@ patternProperties:
         maxItems: 1
 
       operating-points-v2: true
+      opp-table: true
 
       ports:
         $ref: /schemas/graph.yaml#/properties/ports
-- 
2.34.1