ARM: dts: r8a77470: Add EtherAVB support

Define the generic R8A77470 part of the EtherAVB device node.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Chris Paterson <chris.paterson2@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a77470.dtsi

@@ -190,6 +190,19 @@ GIC_SPI 317 IRQ_TYPE_LEVEL_HIGH
 			dma-channels = <15>;
 		};
 
+		avb: ethernet@e6800000 {
+			compatible = "renesas,etheravb-r8a77470",
+				     "renesas,etheravb-rcar-gen2";
+			reg = <0 0xe6800000 0 0x800>, <0 0xee0e8000 0 0x4000>;
+			interrupts = <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 812>;
+			power-domains = <&sysc 32>;
+			resets = <&cpg 812>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
+
 		scif0: serial@e6e60000 {
 			compatible = "renesas,scif-r8a77470",
 				     "renesas,rcar-gen2-scif", "renesas,scif";