arm64: dts: m3ulcb: enable EthernetAVB

This supports Ethernet AVB on M3ULCB board
Signed-off-by: Vladimir Barinov <vladimir.barinov+renesas@cogentembedded.com>
Tested-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7796-m3ulcb.dts

@@ -20,6 +20,7 @@ / {
 
 	aliases {
 		serial0 = &scif2;
+		ethernet0 = &avb;
 	};
 
 	chosen {
@@ -115,6 +116,11 @@ &pfc {
 	pinctrl-0 = <&scif_clk_pins>;
 	pinctrl-names = "default";
 
+	avb_pins: avb {
+		groups = "avb_mdc";
+		function = "avb";
+	};
+
 	scif2_pins: scif2 {
 		groups = "scif2_data_a";
 		function = "scif2";
@@ -155,6 +161,32 @@ sdhi2_pins_uhs: sd2_uhs {
 	};
 };
 
+&avb {
+	pinctrl-0 = <&avb_pins>;
+	pinctrl-names = "default";
+	renesas,no-ether-link;
+	phy-handle = <&phy0>;
+	status = "okay";
+
+	phy0: ethernet-phy@0 {
+		rxc-skew-ps = <900>;
+		rxdv-skew-ps = <0>;
+		rxd0-skew-ps = <0>;
+		rxd1-skew-ps = <0>;
+		rxd2-skew-ps = <0>;
+		rxd3-skew-ps = <0>;
+		txc-skew-ps = <900>;
+		txen-skew-ps = <0>;
+		txd0-skew-ps = <0>;
+		txd1-skew-ps = <0>;
+		txd2-skew-ps = <0>;
+		txd3-skew-ps = <0>;
+		reg = <0>;
+		interrupt-parent = <&gpio2>;
+		interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
+	};
+};
+
 &sdhi0 {
 	pinctrl-0 = <&sdhi0_pins>;
 	pinctrl-1 = <&sdhi0_pins_uhs>;