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Ingenic JZ4740 MUSB driver

Required properties:

- compatible: Must be "ingenic,jz4740-musb"
- reg: Address range of the UDC register set
- interrupts: IRQ number related to the UDC hardware
- interrupt-names: must be "mc"
- clocks: phandle to the "udc" clock
- clock-names: must be "udc"
- phys: phandle to the USB PHY

Example:

usb_phy: usb-phy@0 {
	compatible = "usb-nop-xceiv";
	#phy-cells = <0>;
};

udc: usb@13040000 {
	compatible = "ingenic,jz4740-musb";
	reg = <0x13040000 0x10000>;

	interrupt-parent = <&intc>;
	interrupts = <24>;
	interrupt-names = "mc";

	clocks = <&cgu JZ4740_CLK_UDC>;
	clock-names = "udc";

	phys = <&usb_phy>;
};