187f9fe8cSRob Herring# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause 287f9fe8cSRob Herring%YAML 1.2 387f9fe8cSRob Herring--- 487f9fe8cSRob Herring$id: http://devicetree.org/schemas/thermal/generic-adc-thermal.yaml# 587f9fe8cSRob Herring$schema: http://devicetree.org/meta-schemas/core.yaml# 687f9fe8cSRob Herring 787f9fe8cSRob Herringtitle: General Purpose Analog To Digital Converter (ADC) based thermal sensor 887f9fe8cSRob Herring 987f9fe8cSRob Herringmaintainers: 1087f9fe8cSRob Herring - Laxman Dewangan <ldewangan@nvidia.com> 1187f9fe8cSRob Herring 1287f9fe8cSRob Herringdescription: 1387f9fe8cSRob Herring On some of platforms, thermal sensor like thermistors are connected to 1487f9fe8cSRob Herring one of ADC channel and sensor resistance is read via voltage across the 1587f9fe8cSRob Herring sensor resistor. The voltage read across the sensor is mapped to 1687f9fe8cSRob Herring temperature using voltage-temperature lookup table. 1787f9fe8cSRob Herring 18*2410427cSKrzysztof Kozlowski$ref: thermal-sensor.yaml# 19*2410427cSKrzysztof Kozlowski 2087f9fe8cSRob Herringproperties: 2187f9fe8cSRob Herring compatible: 2287f9fe8cSRob Herring const: generic-adc-thermal 2387f9fe8cSRob Herring 2487f9fe8cSRob Herring '#thermal-sensor-cells': 2587f9fe8cSRob Herring const: 0 2687f9fe8cSRob Herring 2787f9fe8cSRob Herring io-channels: 2887f9fe8cSRob Herring maxItems: 1 2987f9fe8cSRob Herring 3087f9fe8cSRob Herring io-channel-names: 3187f9fe8cSRob Herring const: sensor-channel 3287f9fe8cSRob Herring 3387f9fe8cSRob Herring temperature-lookup-table: 3487f9fe8cSRob Herring description: | 3587f9fe8cSRob Herring Lookup table to map the relation between ADC value and temperature. 3687f9fe8cSRob Herring When ADC is read, the value is looked up on the table to get the 3787f9fe8cSRob Herring equivalent temperature. 3887f9fe8cSRob Herring 3987f9fe8cSRob Herring If not specified, driver assumes the ADC channel gives milliCelsius 4087f9fe8cSRob Herring directly. 4187f9fe8cSRob Herring $ref: /schemas/types.yaml#/definitions/int32-matrix 4287f9fe8cSRob Herring items: 4387f9fe8cSRob Herring items: 4487f9fe8cSRob Herring - description: Temperature in milliCelsius 4587f9fe8cSRob Herring - description: ADC read value 4687f9fe8cSRob Herring 4787f9fe8cSRob Herringrequired: 4887f9fe8cSRob Herring - compatible 4987f9fe8cSRob Herring - io-channels 5087f9fe8cSRob Herring - io-channel-names 5187f9fe8cSRob Herring 52*2410427cSKrzysztof KozlowskiunevaluatedProperties: false 5387f9fe8cSRob Herring 5487f9fe8cSRob Herringexamples: 5587f9fe8cSRob Herring - | 5687f9fe8cSRob Herring #include <dt-bindings/thermal/thermal.h> 5787f9fe8cSRob Herring 5887f9fe8cSRob Herring thermal-sensor { 5987f9fe8cSRob Herring compatible = "generic-adc-thermal"; 6087f9fe8cSRob Herring #thermal-sensor-cells = <0>; 6187f9fe8cSRob Herring io-channels = <&ads1015 1>; 6287f9fe8cSRob Herring io-channel-names = "sensor-channel"; 6387f9fe8cSRob Herring temperature-lookup-table = < 6487f9fe8cSRob Herring (-40000) 2578 6587f9fe8cSRob Herring (-39000) 2577 6687f9fe8cSRob Herring (-38000) 2576 6787f9fe8cSRob Herring (-37000) 2575 6887f9fe8cSRob Herring (-36000) 2574 6987f9fe8cSRob Herring (-35000) 2573 7087f9fe8cSRob Herring (-34000) 2572 7187f9fe8cSRob Herring (-33000) 2571 7287f9fe8cSRob Herring (-32000) 2569 7387f9fe8cSRob Herring (-31000) 2568 7487f9fe8cSRob Herring (-30000) 2567 7587f9fe8cSRob Herring /* skip */ 7687f9fe8cSRob Herring 118000 254 7787f9fe8cSRob Herring 119000 247 7887f9fe8cSRob Herring 120000 240 7987f9fe8cSRob Herring 121000 233 8087f9fe8cSRob Herring 122000 226 8187f9fe8cSRob Herring 123000 220 8287f9fe8cSRob Herring 124000 214 8387f9fe8cSRob Herring 125000 208>; 8487f9fe8cSRob Herring }; 8587f9fe8cSRob Herring... 86