ARM: tegra: cardhu: Support CPU thermal throttling

Enable CPU thermal throttling on Tegra30 Cardhu board.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-cardhu.dtsi

 // SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/thermal/thermal.h>
 #include "tegra30.dtsi"
 #include "tegra30-cpu-opp.dtsi"
 #include "tegra30-cpu-opp-microvolt.dtsi"
@@ -341,12 +342,13 @@ ldo8_reg: ldo8 {
 			};
 		};
 
-		temperature-sensor@4c {
+		nct1008: temperature-sensor@4c {
 			compatible = "onnn,nct1008";
 			reg = <0x4c>;
 			vcc-supply = <&sys_3v3_reg>;
 			interrupt-parent = <&gpio>;
 			interrupts = <TEGRA_GPIO(CC, 2) IRQ_TYPE_LEVEL_LOW>;
+			#thermal-sensor-cells = <1>;
 		};
 
 		vdd_core: tps62361@60 {
@@ -440,21 +442,25 @@ cpus {
 		cpu0: cpu@0 {
 			cpu-supply = <&vddctrl_reg>;
 			operating-points-v2 = <&cpu0_opp_table>;
+			#cooling-cells = <2>;
 		};
 
 		cpu1: cpu@1 {
 			cpu-supply = <&vddctrl_reg>;
 			operating-points-v2 = <&cpu0_opp_table>;
+			#cooling-cells = <2>;
 		};
 
 		cpu2: cpu@2 {
 			cpu-supply = <&vddctrl_reg>;
 			operating-points-v2 = <&cpu0_opp_table>;
+			#cooling-cells = <2>;
 		};
 
 		cpu3: cpu@3 {
 			cpu-supply = <&vddctrl_reg>;
 			operating-points-v2 = <&cpu0_opp_table>;
+			#cooling-cells = <2>;
 		};
 	};
 
@@ -637,6 +643,41 @@ sound {
 					 <&tegra_car TEGRA30_CLK_EXTERN1>;
 	};
 
+	thermal-zones {
+		cpu-thermal {
+			polling-delay-passive = <1000>; /* milliseconds */
+			polling-delay = <5000>; /* milliseconds */
+
+			thermal-sensors = <&nct1008 1>;
+
+			trips {
+				trip0: cpu-alert0 {
+					/* throttle at 57C until temperature drops to 56.8C */
+					temperature = <57000>;
+					hysteresis = <200>;
+					type = "passive";
+				};
+
+				trip1: cpu-crit {
+					/* shut down at 60C */
+					temperature = <60000>;
+					hysteresis = <2000>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					trip = <&trip0>;
+					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";