arm64: dts: qcom: msm8994: Add USB support

This is a very basic dwc3 configuration (no PHYs yet),
but it works.
Signed-off-by: Konrad Dybcio <konradybcio@gmail.com>
Link: https://lore.kernel.org/r/20201005150313.149754-10-konradybcio@gmail.comSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/msm8994.dtsi

@@ -282,6 +282,37 @@ frame@f9028000 {
 			};
 		};
 
+		usb3: usb@f92f8800 {
+			compatible = "qcom,msm8996-dwc3", "qcom,dwc3";
+			reg = <0xf92f8800 0x400>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+
+			clocks = <&gcc GCC_USB30_MASTER_CLK>,
+				 <&gcc GCC_SYS_NOC_USB3_AXI_CLK>,
+				 <&gcc GCC_USB30_SLEEP_CLK>,
+				 <&gcc GCC_USB30_MOCK_UTMI_CLK>;
+			clock-names = "core", "iface", "sleep", "mock_utmi", "ref", "xo";
+
+			assigned-clocks = <&gcc GCC_USB30_MOCK_UTMI_CLK>,
+					  <&gcc GCC_USB30_MASTER_CLK>;
+			assigned-clock-rates = <19200000>, <120000000>;
+
+			power-domains = <&gcc USB30_GDSC>;
+			qcom,select-utmi-as-pipe-clk;
+
+			dwc3@f9200000 {
+				compatible = "snps,dwc3";
+				reg = <0xf9200000 0xcc00>;
+				interrupts = <0 131 IRQ_TYPE_LEVEL_HIGH>;
+				snps,dis_u2_susphy_quirk;
+				snps,dis_enblslpm_quirk;
+				maximum-speed = "high-speed";
+				dr_mode = "peripheral";
+			};
+		};
+
 		sdhc1: sdhci@f9824900 {
 			compatible = "qcom,sdhci-msm-v4";
 			reg = <0xf9824900 0x1a0>, <0xf9824000 0x800>;