Lantiq XWAY SoC RCU USB 1.1/2.0 PHY binding
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This binding describes the USB PHY hardware provided by the RCU module on the
Lantiq XWAY SoCs.

This node has to be a sub node of the Lantiq RCU block.

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Required properties (controller (parent) node):
- compatible	: Should be one of
			"lantiq,ase-usb2-phy"
			"lantiq,danube-usb2-phy"
			"lantiq,xrx100-usb2-phy"
			"lantiq,xrx200-usb2-phy"
			"lantiq,xrx300-usb2-phy"
- reg		: Defines the following sets of registers in the parent
		  syscon device
			- Offset of the USB PHY configuration register
			- Offset of the USB Analog configuration
			  register (only for xrx200 and xrx200)
- clocks	: References to the (PMU) "phy" clk gate.
- clock-names	: Must be "phy"
- resets	: References to the RCU USB configuration reset bits.
- reset-names	: Must be one of the following:
			"phy" (optional)
			"ctrl" (shared)

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Example for the USB PHYs on an xRX200 SoC:
	usb_phy0: usb2-phy@18 {
		compatible = "lantiq,xrx200-usb2-phy";
		reg = <0x18 4>, <0x38 4>;

		clocks = <&pmu PMU_GATE_USB0_PHY>;
		clock-names = "phy";
		resets = <&reset1 4 4>, <&reset0 4 4>;
		reset-names = "phy", "ctrl";
		#phy-cells = <0>;
	};