关键词：rockchip,rk3328-dwc3; rockchip,rk322xh-dwc3; rockchip,rk3328-u3phy; 

RK3328 — DWC3 USB with inno USB3 phy DTS 配置

1、必须设置的属性值：

- compatible : 必须取以下两个字符串的其中一个:
  * "rockchip,rk3328-dwc3"
  * "rockchip,rk322xh-dwc3"
- clocks : 设置clock, 与clock-names 一一对应。
- clock-names : 取以下三个名字:
  * "ref_clk" 控制器的主时钟，必须是24Mhz
  * "suspend_clk" 控制器的待机时钟，必须是 24 MHz 或者 32 KHz
  * "bus_clk" 总线时钟，超高速必须是>=62.5Mhz,高速必须>=30Mhz.

2、以rk3328为例：

	u3phy: usb3-phy@ff470000 {
		compatible = "rockchip,rk3328-u3phy";
		reg = <0x0 0xff470000 0x0 0x0>;
		...

		u3phy_utmi: utmi@ff470000 {
			reg = <0x0 0xff470000 0x0 0x8000>;
			#phy-cells = <0>;
		};

		u3phy_pipe: pipe@ff478000 {
			reg = <0x0 0xff478000 0x0 0x8000>;
			#phy-cells = <0>;
		};
	};

	usbdrd3: usb@ff600000 {
		compatible = "rockchip,rk3328-dwc3";
		clocks = <&cru SCLK_USB3OTG_REF>, <&cru SCLK_USB3OTG_SUSPEND>,
			 <&cru ACLK_USB3OTG>;
		clock-names = "ref_clk", "suspend_clk",
			      "bus_clk";
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;

		usbdrd_dwc3: dwc3@ff600000 {
			compatible = "snps,dwc3";
			reg = <0x0 0xff600000 0x0 0x100000>;
			interrupts = <GIC_SPI 67 IRQ_TYPE_LEVEL_HIGH>;
			dr_mode = "host";
			phys = <&u3phy_utmi>, <&u3phy_pipe>;
			phy-names = "usb2-phy", "usb3-phy";
			phy_type = "utmi_wide";
		};
	};