diff --git a/target/linux/mvebu/files/arch/arm/boot/dts/armada-370-buffalo-ls421de.dts b/target/linux/mvebu/files/arch/arm/boot/dts/armada-370-buffalo-ls421de.dts
index dee271541e..57f1acf5f1 100644
--- a/target/linux/mvebu/files/arch/arm/boot/dts/armada-370-buffalo-ls421de.dts
+++ b/target/linux/mvebu/files/arch/arm/boot/dts/armada-370-buffalo-ls421de.dts
@@ -50,31 +50,30 @@
 	};
 
 	thermal-zones {
-		chassis-thermal {
+		hdd-thermal {
 			polling-delay = <20000>;
 			polling-delay-passive = <2000>;
 
-			thermal-sensors = <&hdd0_temp>, <&hdd1_temp>;
-			coefficients = <1 1>;
+			thermal-sensors = <&hdd0_temp>; /* only one drivetemp sensor is supported */
 
 			trips {
-				chassis_alert1: chassis-alert1 {
+				hdd_alert1: trip1 {
 					temperature = <36000>;
 					hysteresis = <2000>;
 					type = "active";
 				};
-				chassis_alert2: chassis-alert2 {
-					temperature = <46000>;
+				hdd_alert2: trip2 {
+					temperature = <44000>;
 					hysteresis = <2000>;
 					type = "active";
 				};
-				chassis_alert3: chassis-alert3 {
-					temperature = <56000>;
+				hdd_alert3: trip3 {
+					temperature = <52000>;
 					hysteresis = <2000>;
 					type = "passive";
 				};
-				chassis_crit: chassis-crit {
-					temperature = <66000>;
+				hdd_crit: trip4 {
+					temperature = <60000>;
 					hysteresis = <2000>;
 					type = "critical";
 				};
@@ -82,19 +81,48 @@
 
 			cooling-maps {
 				map1 {
-					trip = <&chassis_alert1>;
+					trip = <&hdd_alert1>;
 					cooling-device = <&system_fan THERMAL_NO_LIMIT 1>;
 				};
 				map2 {
-					trip = <&chassis_alert2>;
+					trip = <&hdd_alert2>;
 					cooling-device = <&system_fan 2 2>;
 				};
 				map3 {
-					trip = <&chassis_alert3>;
+					trip = <&hdd_alert3>;
 					cooling-device = <&system_fan 3 THERMAL_NO_LIMIT>;
 				};
 			};
 		};
+
+		ethphy-thermal {
+			polling-delay = <20000>;
+			polling-delay-passive = <2000>;
+
+			thermal-sensors = <&ethphy0>;
+
+			trips {
+				ethphy_alert1: trip1 {
+					temperature = <65000>;
+					hysteresis = <4000>;
+					type = "passive";
+				};
+
+				ethphy_crit: trip2 {
+					temperature = <100000>;
+					hysteresis = <2000>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map1 {
+					trip = <&ethphy_alert1>;
+					cooling-device = <&system_fan THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+
+			};
+		};
 	};
 
 	gpio_keys {
@@ -243,6 +271,7 @@
 		marvell,reg-init = <0x3 0x10 0x1 0x1991>, /* LED function */
 				   <0x3 0x11 0x1 0x4401>, /* LED polarity */
 				   <0x3 0x12 0x1 0x4905>; /* LED timer */
+		#thermal-sensor-cells = <0>;
 	};
 };