Hisilicon hi3660 usb PHY
-----------------------

Required properties:
- compatible: should be "hisilicon,hi3660-usb-phy"
- #phy-cells: must be 0
- hisilicon,pericrg-syscon: phandle of syscon used to control phy.
- hisilicon,pctrl-syscon: phandle of syscon used to control phy.
- hisilicon,usb3-otg-bc-syscon: phandle of syscon used to control phy.
- eye-diagram-param: parameter set for phy
Refer to phy/phy-bindings.txt for the generic PHY binding properties

Example:
	usb_phy: usbphy {
		compatible = "hisilicon,hi3660-usb-phy";
		#phy-cells = <0>;
		hisilicon,pericrg-syscon = <&crg_ctrl>;
		hisilicon,pctrl-syscon = <&pctrl>;
		hisilicon,usb3-otg-bc-syscon = <&usb3_otg_bc>;
		eye-diagram-param = <0x22466e4>;
	};
