[][Add dts files for Panther RFBs with 2.5G WAN port]

[Description]
Add dts files for Panther RFBs with 2.5G WAN port, and keep other RFBs
using switch port4 as WAN port.

[Release-log]
N/A

Change-Id: Ie9703fbbead0e08b148b634b026b17ef4995e850
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4688543
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-nor-rfb.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-nor-rfb.dts
new file mode 100644
index 0000000..77c1d73
--- /dev/null
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-nor-rfb.dts
@@ -0,0 +1,34 @@
+/dts-v1/;
+#include "mt7986a-rfb.dtsi"
+/ {
+	model = "MediaTek MT7986a RFB";
+	compatible = "mediatek,mt7986a-2500wan-nor-rfb";
+};
+
+&wbsys {
+	mediatek,mtd-eeprom = <&factory 0x0000>;
+	status = "okay";
+};
+
+&mdio {
+	switch@0 {
+		ports {
+			port@4 {
+				reg = <4>;
+				label = "lan4";
+			};
+
+			port@5 {
+				reg = <5>;
+				label = "lan5";
+				phy-mode = "2500base-x";
+
+				fixed-link {
+					speed = <2500>;
+					full-duplex;
+					pause;
+				};
+			};
+		};
+	};
+};