* Cadence USB3 Controller

Required properties:
- compatible: "Cadence,usb3";
- reg: base address and length of the registers
- interrupts: interrupt for the USB controller
- interrupt-parent: the interrupt parent for this module
- clocks: reference to the USB clock
- clock-names: the name of clocks
- cdns3,usbphy: reference to the USB PHY

Optional properties:
- dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"
- extcon: extcon phandler for cdns3 device
- power-domains: the power domain for cdns3 controller and phy

Examples:

usbotg3: cdns3@5b110000 {
	compatible = "Cadence,usb3";
	reg = <0x0 0x5B110000 0x0 0x10000>,
		<0x0 0x5B130000 0x0 0x10000>,
		<0x0 0x5B140000 0x0 0x10000>,
		<0x0 0x5B160000 0x0 0x40000>;
	interrupt-parent = <&gic>;
	interrupts = <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>;
	clocks = <&clk IMX8QM_USB3_LPM_CLK>,
		<&clk IMX8QM_USB3_BUS_CLK>,
		<&clk IMX8QM_USB3_ACLK>,
		<&clk IMX8QM_USB3_IPG_CLK>,
		<&clk IMX8QM_USB3_CORE_PCLK>;
	clock-names = "usb3_lpm_clk", "usb3_bus_clk", "usb3_aclk",
		"usb3_ipg_clk", "usb3_core_pclk";
	power-domains = <&pd_conn_usb2>;
	cdns3,usbphy = <&usbphynop1>;
	dr_mode = "otg";
	extcon = <&typec_ptn5150>;
	status = "disabled";
};