ARM: dts: BCM5301X: Add CPU thermal sensor and zone

This uses CPU thermal sensor available on every Northstar chipset to
monitor temperature. We don't have any cooling or throttling so only a
critical trip was added.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm5301x.dtsi

@@ -349,6 +349,12 @@ genpll: genpll@1800c140 {
 				     "sata2";
 	};
 
+	thermal: thermal@1800c2c0 {
+		compatible = "brcm,ns-thermal";
+		reg = <0x1800c2c0 0x10>;
+		#thermal-sensor-cells = <0>;
+	};
+
 	srab: srab@18007000 {
 		compatible = "brcm,bcm5301x-srab";
 		reg = <0x18007000 0x1000>;
@@ -412,4 +418,24 @@ spi_nor: spi-nor@0 {
 			status = "disabled";
 		};
 	};
+
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			polling-delay-passive = <0>;
+			polling-delay = <1000>;
+			coefficients = <(-556) 418000>;
+			thermal-sensors = <&thermal>;
+
+			trips {
+				cpu-crit {
+					temperature	= <125000>;
+					hysteresis	= <0>;
+					type		= "critical";
+				};
+			};
+
+			cooling-maps {
+			};
+		};
+	};
 };