dt-bindings: phy: qcom, hdmi-phy-qmp: add clock-cells and XO clock

As the QMP HDMI PHY is a clock provider, add constant #clock-cells
property. For the compatibility with older DTs the property is not
marked as required. Also add the XO clock to the list of the clocks used
by the driver.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/492316/
Link: https://lore.kernel.org/r/20220704161148.814510-2-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

Documentation/devicetree/bindings/phy/qcom,hdmi-phy-qmp.yaml

@@ -28,12 +28,15 @@ properties:
       - const: hdmi_phy
 
   clocks:
-    maxItems: 2
+    minItems: 2
+    maxItems: 3
 
   clock-names:
+    minItems: 2
     items:
       - const: iface
       - const: ref
+      - const: xo
 
   power-domains:
     maxItems: 1
@@ -44,6 +47,9 @@ properties:
   vddio-supply:
     description: phandle to VDD I/O supply regulator
 
+  '#clock-cells':
+    const: 0
+
   '#phy-cells':
     const: 0
 
@@ -75,9 +81,12 @@ examples:
                   "hdmi_phy";
 
       clocks = <&mmcc 116>,
-               <&gcc 214>;
+               <&gcc 214>,
+               <&xo_board>;
       clock-names = "iface",
-                    "ref";
+                    "ref",
+                    "xo";
+      #clock-cells = <0>;
       #phy-cells = <0>;
 
       vddio-supply = <&vreg_l12a_1p8>;