phy: dt-bindings: cdns,dphy: add power-domains property

This property is needed on TI platforms to enable the PD of the DPHY
before it can be used.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rob Herring <robh@kernel.org>

Link: https://lore.kernel.org/r/20220301111621.2992275-4-p.yadav@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/cdns,dphy.yaml

@@ -30,6 +30,9 @@ properties:
   "#phy-cells":
     const: 0
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -41,11 +44,13 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
 
     dphy0: phy@fd0e0000{
         compatible = "cdns,dphy";
         reg = <0xfd0e0000 0x1000>;
         clocks = <&psm_clk>, <&pll_ref_clk>;
         clock-names = "psm", "pll_ref";
+        power-domains = <&k3_pds 147 TI_SCI_PD_EXCLUSIVE>;
         #phy-cells = <0>;
     };