Documentation/devicetree/bindings/usb/usb-hcd.txt

   1 Generic USB HCD (Host Controller Device) Properties
   2
   3 Optional properties:
   4 - phys: a list of all USB PHYs on this HCD
   5
   6 Example:
   7         &usb1 {
   8                 phys = <&usb2_phy1>, <&usb3_phy1>;
   9         };