* Thermal Sensor for Lantiq SoCs

These are the bindings for Lantiq GRX500/XRX500 on-SoC thermal sensor. It's
not irq driven sensor so it needs thermal zone definition (see example below)
to poll the sensor periodically.

Required properties:
- compatible:
  - "lantiq,ts-xrx500" for Lantiq GRX500 SoC
  - "intel,ts-prx300" for prx300 SoC

- intel,syscon: phandle to syscon node


Example of sensor definition:

ts: ts@080000 {
	#thermal-sensor-cells = <0>;

	compatible = "lantiq,ts-xrx500";
	intel,syscon = <&sysconf>;
};


Example of thermal zone definition:

thermal-zones {
	cpu_thermal: cpu-thermal {
		polling-delay-passive = <500>; /* milliseconds */
		polling-delay = <1000>; /* milliseconds */

		thermal-sensors = <&ts>;

		trips {
			cpu_alert0: cpu-alert0 {
				temperature = <65000>; /* millicelsius */
				hysteresis = <2000>; /* millicelsius */
				type = "passive";
			};
			cpu_alert1: cpu-alert1 {
				temperature = <100000>; /* millicelsius */
				hysteresis = <10000>; /* millicelsius */
				type = "passive";
			};
			cpu_crit: cpu-crit {
				temperature = <125000>; /* millicelsius */
				hysteresis = <10000>; /* millicelsius */
				type = "critical";
			};
		};

		cooling-maps {
			map0 {
				trip = <&cpu_alert0>;
				cooling-device = <&cpu0 THERMAL_NO_LIMIT 1>;
			};
			map1 {
				trip = <&cpu_alert1>;
				cooling-device = <&cpu0 2 THERMAL_NO_LIMIT>;
			};
		};
	};
};