boards: arm: mps2_an385: Add DTS node for Ethernet controller

The board has SMSC LAN9220 (actually as an "IP core" in an
FPGA-emulated SoC). The patch includes DTS bindings for this device.

Signed-off-by: Paul Sokolovsky <[email protected]>

Author: pfalcon

boards/arm/mps2_an385/mps2_an385.dts

@@ -128,6 +128,16 @@
 			interrupts = <17 3>;
 		};
 
+		eth0: eth@0 {
+			/* Linux has "smsc,lan9115" */
+			compatible = "smsc,lan9220";
+			/* Such a big size from memory map in AN385 */
+			/* Actual reg range is ~0x200 */
+			reg = <0x40200000 0x100000>;
+			label = "eth0";
+			interrupts = <13 3>;
+		};
+
 		i2c_touch: i2c@40022000 {
 			compatible = "arm,versatile-i2c";
 			clock-frequency = <I2C_BITRATE_STANDARD>;

dts/bindings/ethernet/smsc,lan9220.yaml

@@ -0,0 +1,31 @@
+#
+# Copyright (c) 2018 Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+title: SMSC/Microchip LAN9220 Ethernet controller
+id: smsc,lan9220
+version: 0.1
+
+description: >
+     This is a representation of the formerly SMSC, now Microchip, LAN9220
+     Ethernet controller.
+
+properties:
+    compatible:
+      type: string
+      category: required
+      description: compatible strings
+      constraint: "smsc,lan9220"
+
+    reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+    interrupts:
+      type: array
+      category: required
+      description: required interrupts
+      generation: define