85 lines
2.2 KiB
YAML
85 lines
2.2 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/thermal/generic-adc-thermal.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: General Purpose Analog To Digital Converter (ADC) based thermal sensor
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maintainers:
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- Laxman Dewangan <ldewangan@nvidia.com>
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description:
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On some of platforms, thermal sensor like thermistors are connected to
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one of ADC channel and sensor resistance is read via voltage across the
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sensor resistor. The voltage read across the sensor is mapped to
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temperature using voltage-temperature lookup table.
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properties:
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compatible:
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const: generic-adc-thermal
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'#thermal-sensor-cells':
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const: 0
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io-channels:
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maxItems: 1
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io-channel-names:
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const: sensor-channel
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temperature-lookup-table:
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description: |
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Lookup table to map the relation between ADC value and temperature.
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When ADC is read, the value is looked up on the table to get the
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equivalent temperature.
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If not specified, driver assumes the ADC channel gives milliCelsius
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directly.
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$ref: /schemas/types.yaml#/definitions/int32-matrix
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items:
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items:
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- description: Temperature in milliCelsius
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- description: ADC read value
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required:
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- compatible
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- '#thermal-sensor-cells'
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- io-channels
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- io-channel-names
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/thermal/thermal.h>
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thermal-sensor {
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compatible = "generic-adc-thermal";
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#thermal-sensor-cells = <0>;
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io-channels = <&ads1015 1>;
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io-channel-names = "sensor-channel";
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temperature-lookup-table = <
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(-40000) 2578
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(-39000) 2577
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(-38000) 2576
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(-37000) 2575
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(-36000) 2574
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(-35000) 2573
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(-34000) 2572
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(-33000) 2571
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(-32000) 2569
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(-31000) 2568
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(-30000) 2567
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/* skip */
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118000 254
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119000 247
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120000 240
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121000 233
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122000 226
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123000 220
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124000 214
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125000 208>;
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};
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...
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