--- /dev/null
+++ b/target/linux/ath79/dts/ar9342_ubnt_powerbeam-m5-300.dts
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9342_ubnt_xw.dtsi"
+
+/ {
+	compatible = "ubnt,powerbeam-m5-300", "ubnt,xw", "qca,ar9342";
+	model = "Ubiquiti PowerBeam M5 300";
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <0x1>;
+
+	phy1: ethernet-phy@1 {
+		reg = <1>;
+		phy-mode = "mii";
+		reset-gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&phy1>;
+};
--- a/target/linux/ath79/image/generic-ubnt.mk
+++ b/target/linux/ath79/image/generic-ubnt.mk
@@ -157,6 +157,14 @@
 endef
 TARGET_DEVICES += ubnt_powerbeam-m5-xw
 
+define Device/ubnt_powerbeam-m5-300
+  $(Device/ubnt-xw)
+  DEVICE_MODEL := PowerBeam M5 300
+  DEVICE_PACKAGES += rssileds
+  SUPPORTED_DEVICES += loco-m-xw
+endef
+TARGET_DEVICES += ubnt_powerbeam-m5-300
+
 define Device/ubnt_rocket-m-xw
   $(Device/ubnt-xw)
   DEVICE_MODEL := Rocket M5 XW