dts: powerpc: p1020rdb: Add eTSEC DT nodes

P1020RDB implements 3 enhanced three-speed Ethernet controllers,
and the connection is shown below:
    eTSEC1: Connected to RGMII switch VSC7385
    eTSEC2: Connected to SGMII PHY VSC8221
    eTSEC3: Connected to SGMII PHY AR8021

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/powerpc/dts/pq3-etsec2-0.dtsi b/arch/powerpc/dts/pq3-etsec2-0.dtsi
new file mode 100644
index 0000000..f9d3d04
--- /dev/null
+++ b/arch/powerpc/dts/pq3-etsec2-0.dtsi
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0+ OR X11
+/*
+ * PQ3 eTSEC2 device tree stub [ @ offsets 0x24000/0xb0000 ]
+ *
+ * Copyright 2011 Freescale Semiconductor Inc.
+ * Copyright 2020 NXP
+ */
+
+mdio@24000 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	compatible = "fsl,etsec2-mdio";
+	reg = <0x24000 0x1000 0xb0030 0x4>;
+};
+
+ethernet@b0000 {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	device_type = "network";
+	model = "eTSEC";
+	compatible = "fsl,etsec2";
+	reg = <0xb0000 0x1000>;
+	fsl,num_rx_queues = <0x8>;
+	fsl,num_tx_queues = <0x8>;
+	fsl,magic-packet;
+	local-mac-address = [ 00 00 00 00 00 00 ];
+	ranges;
+
+	queue-group@b0000 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0xb0000 0x1000>;
+		interrupts = <29 2 0 0 30 2 0 0 34 2 0 0>;
+	};
+};