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USB OHCI controllers

Required properties:
- compatible : "usb-ohci"
- reg : ohci controller register range (address and length)
- interrupts : ohci controller interrupt

Optional properties:
- clocks : a list of phandle + clock specifier pairs
- phys : phandle + phy specifier pair
- phy-names : "usb"

Example:

	ohci0: usb@01c14400 {
		compatible = "allwinner,sun4i-a10-ohci", "usb-ohci";
		reg = <0x01c14400 0x100>;
		interrupts = <64>;
		clocks = <&usb_clk 6>, <&ahb_gates 2>;
		phys = <&usbphy 1>;
		phy-names = "usb";
	};

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