dt-bindings: display: qcom,sm8650-mdss: explicitly document mdp0-mem and cpu-cfg interconnect paths

The mdp1-mem is not supported on the SM8550 SoCs, and having maxItems=2
makes the bindings not clear if mdp0-mem/mdp1-mem or mdp0-mem/cpu-cfg
is required, so explicitly document the mdp0-mem/cpu-cfg interconnect
paths and complete the example with the missing interconnect paths.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/637051/
Link: https://lore.kernel.org/r/20250213-topic-sm8x50-mdss-interconnect-bindings-fix-v4-2-3fa0bc42dd38@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -29,10 +29,14 @@ properties:
     maxItems: 1
 
   interconnects:
-    maxItems: 2
+    items:
+      - description: Interconnect path from mdp0 port to the data bus
+      - description: Interconnect path from CPU to the reg bus
 
   interconnect-names:
-    maxItems: 2
+    items:
+      - const: mdp0-mem
+      - const: cpu-cfg
 
 patternProperties:
   "^display-controller@[0-9a-f]+$":
@@ -75,12 +79,17 @@ examples:
     #include <dt-bindings/clock/qcom,rpmh.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/power/qcom,rpmhpd.h>
+    #include <dt-bindings/interconnect/qcom,sm8650-rpmh.h>
 
     display-subsystem@ae00000 {
         compatible = "qcom,sm8650-mdss";
         reg = <0x0ae00000 0x1000>;
         reg-names = "mdss";
 
+        interconnects = <&mmss_noc MASTER_MDP 0 &mc_virt SLAVE_EBI1 0>,
+                        <&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_DISPLAY_CFG 0>;
+        interconnect-names = "mdp0-mem", "cpu-cfg";
+
         resets = <&dispcc_core_bcr>;
 
         power-domains = <&dispcc_gdsc>;