| # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/thermal/generic-adc-thermal.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: General Purpose Analog To Digital Converter (ADC) based thermal sensor |
| |
| maintainers: |
| - Laxman Dewangan <ldewangan@nvidia.com> |
| |
| description: |
| 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. |
| |
| properties: |
| compatible: |
| const: generic-adc-thermal |
| |
| '#thermal-sensor-cells': |
| const: 0 |
| |
| io-channels: |
| maxItems: 1 |
| |
| io-channel-names: |
| const: sensor-channel |
| |
| temperature-lookup-table: |
| description: | |
| 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. |
| |
| If not specified, driver assumes the ADC channel gives milliCelsius |
| directly. |
| $ref: /schemas/types.yaml#/definitions/int32-matrix |
| items: |
| items: |
| - description: Temperature in milliCelsius |
| - description: ADC read value |
| |
| required: |
| - compatible |
| - '#thermal-sensor-cells' |
| - io-channels |
| - io-channel-names |
| |
| additionalProperties: false |
| |
| examples: |
| - | |
| #include <dt-bindings/thermal/thermal.h> |
| |
| 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 |
| /* skip */ |
| 118000 254 |
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| 120000 240 |
| 121000 233 |
| 122000 226 |
| 123000 220 |
| 124000 214 |
| 125000 208>; |
| }; |
| ... |
