ARM: rmobile: dts: Add XHCI USB node to r8a7796

The R8A7796 XHCI USB nodes are missing from r8a7796 dtsi, add them.
These nodes don't come from mainline Linux, yet the DT binding is
similar enough to R8A7795 which already has those in mainline and
once the nodes hit mainline, this DT should be resynched.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/dts/r8a7796.dtsi b/arch/arm/dts/r8a7796.dtsi
index 7e3b1d8..9e6a5f2 100644
--- a/arch/arm/dts/r8a7796.dtsi
+++ b/arch/arm/dts/r8a7796.dtsi
@@ -1120,7 +1120,13 @@
 		};
 
 		xhci0: usb@ee000000 {
-			/* placeholder */
+			compatible = "renesas,xhci-r8a7796", "renesas,rcar-gen3-xhci";
+			reg = <0 0xee000000 0 0xc00>;
+			interrupts = <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 328>;
+			power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
+			resets = <&cpg 328>;
+			status = "disabled";
 		};
 
 		ohci0: usb@ee080000 {