ARM: dts: at91: sama7g5: add thermal zones node

Add thermal zones node with its associated trips and cooling-maps.
It uses CPUFreq as cooling device for temperatures in the interval
[90, 100) degrees Celsius and describe the temperature of 100 degrees
Celsius as critical temperature. System will be is shutting down when
reaching critical temperature.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221026124114.985876-7-claudiu.beznea@microchip.com

Author: claudiubeznea

arch/arm/boot/dts/sama7g5.dtsi

@@ -17,6 +17,7 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/mfd/at91-usart.h>
 #include <dt-bindings/nvmem/microchip,sama7g5-otpc.h>
+#include <dt-bindings/thermal/thermal.h>
 
 / {
 	model = "Microchip SAMA7G5 family SoC";
@@ -36,6 +37,7 @@
 			clocks = <&pmc PMC_TYPE_CORE PMC_CPUPLL>;
 			clock-names = "cpu";
 			operating-points-v2 = <&cpu_opp_table>;
+			#cooling-cells = <2>; /* min followed by max */
 		};
 	};
 
@@ -74,6 +76,46 @@
 		};
 	};
 
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			polling-delay-passive = <1000>;
+			polling-delay = <5000>;
+			thermal-sensors = <&thermal_sensor>;
+
+			trips {
+				cpu_normal: cpu-alert0 {
+					temperature = <90000>;
+					hysteresis = <0>;
+					type = "passive";
+				};
+
+				cpu_hot: cpu-alert1 {
+					temperature = <95000>;
+					hysteresis = <0>;
+					type = "passive";
+				};
+
+				cpu_critical: cpu-critical {
+					temperature = <100000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					trip = <&cpu_normal>;
+					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+
+				map1 {
+					trip = <&cpu_hot>;
+					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+	};
+
 	clocks {
 		slow_xtal: slow_xtal {
 			compatible = "fixed-clock";