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-General Purpose Analog To Digital Converter (ADC) based thermal sensor.
-
-On some of platforms, thermal sensor like thermistors are connected to
-one of ADC channel and sensor resistance is read via voltage across the
-sensor resistor. The voltage read across the sensor is mapped to
-temperature using voltage-temperature lookup table.
-
-Required properties:
-===================
-- compatible: Must be "generic-adc-thermal".
-- #thermal-sensor-cells: Should be 1. See Documentation/devicetree/bindings/thermal/thermal-sensor.yaml for a description
- of this property.
-Optional properties:
-===================
-- temperature-lookup-table: Two dimensional array of Integer; lookup table
- to map the relation between ADC value and
- temperature. When ADC is read, the value is
- looked up on the table to get the equivalent
- temperature.
-
- The first value of the each row of array is the
- temperature in milliCelsius and second value of
- the each row of array is the ADC read value.
-
- If not specified, driver assumes the ADC channel
- gives milliCelsius directly.
-
-Example :
-#include <dt-bindings/thermal/thermal.h>
-
-i2c@7000c400 {
- ads1015: ads1015@4a {
- reg = <0x4a>;
- compatible = "ads1015";
- sampling-frequency = <3300>;
- #io-channel-cells = <1>;
- };
-};
-
-tboard_thermistor: thermal-sensor {
- compatible = "generic-adc-thermal";
- #thermal-sensor-cells = <0>;
- io-channels = <&ads1015 1>;
- io-channel-names = "sensor-channel";
- temperature-lookup-table = < (-40000) 2578
- (-39000) 2577
- (-38000) 2576
- (-37000) 2575
- (-36000) 2574
- (-35000) 2573
- (-34000) 2572
- (-33000) 2571
- (-32000) 2569
- (-31000) 2568
- (-30000) 2567
- ::::::::::
- 118000 254
- 119000 247
- 120000 240
- 121000 233
- 122000 226
- 123000 220
- 124000 214
- 125000 208>;
-};
-
-dummy_cool_dev: dummy-cool-dev {
- compatible = "dummy-cooling-dev";
- #cooling-cells = <2>; /* min followed by max */
-};
-
-thermal-zones {
- Tboard {
- polling-delay = <15000>; /* milliseconds */
- polling-delay-passive = <0>; /* milliseconds */
- thermal-sensors = <&tboard_thermistor>;
-
- trips {
- therm_est_trip: therm_est_trip {
- temperature = <40000>;
- type = "active";
- hysteresis = <1000>;
- };
- };
-
- cooling-maps {
- map0 {
- trip = <&therm_est_trip>;
- cooling-device = <&dummy_cool_dev THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
- contribution = <100>;
- };
-
- };
- };
-};