dt-bindings: display/msm: qcom, sa8775p-mdss: Add missing eDP phy

The Qualcomm SA8775p MDSS display block comes with eDP phy, already used
in DTS and already documented in phy/qcom,edp-phy.yaml binding.  Add the
missing device node in the binding and extend example to silence
dtbs_check warnings like:

  sa8775p-ride.dtb: display-subsystem@ae00000: Unevaluated properties are not allowed ('phy@aec2a00', 'phy@aec5a00' were unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/638744/
Link: https://lore.kernel.org/r/20250221151311.138755-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml

@@ -52,6 +52,13 @@ patternProperties:
         items:
           - const: qcom,sa8775p-dp
 
+  "^phy@[0-9a-f]+$":
+    type: object
+    additionalProperties: true
+    properties:
+      compatible:
+        const: qcom,sa8775p-edp-phy
+
 required:
   - compatible
 
@@ -61,6 +68,7 @@ examples:
   - |
     #include <dt-bindings/interconnect/qcom,icc.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/qcom,sa8775p-dispcc.h>
     #include <dt-bindings/clock/qcom,sa8775p-gcc.h>
     #include <dt-bindings/interconnect/qcom,sa8775p-rpmh.h>
     #include <dt-bindings/power/qcom,rpmhpd.h>
@@ -158,6 +166,26 @@ examples:
             };
         };
 
+        mdss0_dp0_phy: phy@aec2a00 {
+            compatible = "qcom,sa8775p-edp-phy";
+
+            reg = <0x0aec2a00 0x200>,
+                  <0x0aec2200 0xd0>,
+                  <0x0aec2600 0xd0>,
+                  <0x0aec2000 0x1c8>;
+
+            clocks = <&dispcc0 MDSS_DISP_CC_MDSS_DPTX0_AUX_CLK>,
+                     <&dispcc0 MDSS_DISP_CC_MDSS_AHB_CLK>;
+            clock-names = "aux",
+                          "cfg_ahb";
+
+            #clock-cells = <1>;
+            #phy-cells = <0>;
+
+            vdda-phy-supply = <&vreg_l1c>;
+            vdda-pll-supply = <&vreg_l4a>;
+        };
+
         displayport-controller@af54000 {
             compatible = "qcom,sa8775p-dp";
 
@@ -186,9 +214,9 @@ examples:
 
             assigned-clocks = <&dispcc_mdss_dptx0_link_clk_src>,
                               <&dispcc_mdss_dptx0_pixel0_clk_src>;
-            assigned-clock-parents = <&mdss0_edp_phy 0>, <&mdss0_edp_phy 1>;
+            assigned-clock-parents = <&mdss0_dp0_phy 0>, <&mdss0_dp0_phy 1>;
 
-            phys = <&mdss0_edp_phy>;
+            phys = <&mdss0_dp0_phy>;
             phy-names = "dp";
 
             operating-points-v2 = <&dp_opp_table>;