# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2 --- $id: http://devicetree.org/schemas/iio/temperature/adi,ltc2983.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: Analog Devices LTC2983, LTC2986, LTM2985 Multi-sensor Temperature system maintainers: - Nuno Sá description: | Analog Devices LTC2983, LTC2984, LTC2986, LTM2985 Multi-Sensor Digital Temperature Measurement Systems https://www.analog.com/media/en/technical-documentation/data-sheets/2983fc.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/2984fb.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/29861fa.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/ltm2985.pdf $defs: sensor-node: type: object description: Sensor node common constraints properties: reg: description: Channel number. Connects the sensor to the channel with this number of the device. minimum: 1 maximum: 20 adi,sensor-type: description: Type of sensor connected to the device. $ref: /schemas/types.yaml#/definitions/uint32 required: - reg - adi,sensor-type properties: compatible: oneOf: - enum: - adi,ltc2983 - adi,ltc2986 - adi,ltm2985 - items: - const: adi,ltc2984 - const: adi,ltc2983 reg: maxItems: 1 interrupts: maxItems: 1 adi,mux-delay-config-us: description: | Extra delay prior to each conversion, in addition to the internal 1ms delay, for the multiplexer to switch input configurations and excitation values. This property is supposed to be in microseconds, but to maintain compatibility, this value will be multiplied by 100 before usage. maximum: 255 default: 0 adi,filter-notch-freq: description: Notch frequency of the digital filter. 0 - 50/60Hz rejection 1 - 60Hz rejection 2 - 50Hz rejection $ref: /schemas/types.yaml#/definitions/uint32 minimum: 0 maximum: 2 default: 0 '#address-cells': const: 1 '#size-cells': const: 0 patternProperties: "^thermocouple@": $ref: '#/$defs/sensor-node' unevaluatedProperties: false description: Thermocouple sensor. properties: adi,sensor-type: description: | 1 - Type J Thermocouple 2 - Type K Thermocouple 3 - Type E Thermocouple 4 - Type N Thermocouple 5 - Type R Thermocouple 6 - Type S Thermocouple 7 - Type T Thermocouple 8 - Type B Thermocouple 9 - Custom Thermocouple $ref: /schemas/types.yaml#/definitions/uint32 minimum: 1 maximum: 9 adi,single-ended: description: Whether the sensor is single-ended. type: boolean adi,sensor-oc-current-microamp: description: Pulsed current value applied during open-circuit detect. enum: [10, 100, 500, 1000] default: 10 adi,cold-junction-handle: description: Sensor responsible for measuring the thermocouple cold junction temperature. $ref: /schemas/types.yaml#/definitions/phandle adi,custom-thermocouple: description: Used for digitizing custom thermocouples. See Page 59 of the datasheet. $ref: /schemas/types.yaml#/definitions/int64-matrix minItems: 3 maxItems: 64 items: items: - description: Voltage point in nV, signed. - description: Temperature point in uK. allOf: - if: properties: adi,sensor-type: const: 9 then: required: - adi,custom-thermocouple "^diode@": $ref: '#/$defs/sensor-node' unevaluatedProperties: false description: Diode sensor. properties: adi,sensor-type: description: Sensor type for diodes. $ref: /schemas/types.yaml#/definitions/uint32 const: 28 adi,single-ended: description: Whether the sensor is single-ended. type: boolean adi,three-conversion-cycles: description: Whether to use three conversion cycles to remove parasitic resistance between the device and the diode. type: boolean adi,average-on: description: Whether to use a running average of the diode temperature reading to reduce the noise when the diode is used as a cold junction temperature element on an isothermal block where temperatures change slowly. type: boolean adi,excitation-current-microamp: description: Magnitude of the 1l excitation current applied to the diode. 4l excitation current will be 4 times this value, and 8l excitation current will be 8 times value. enum: [10, 20, 40, 80] default: 10 adi,ideal-factor-value: description: Diode ideality factor. Set this property to 1000000 times the real value. $ref: /schemas/types.yaml#/definitions/uint32 default: 0 "^rtd@": $ref: '#/$defs/sensor-node' unevaluatedProperties: false description: RTD sensor. properties: reg: minimum: 2 maximum: 20 adi,sensor-type: description: | 10 - RTD PT-10 11 - RTD PT-50 12 - RTD PT-100 13 - RTD PT-200 14 - RTD PT-500 15 - RTD PT-1000 16 - RTD PT-1000 (0.00375) 17 - RTD NI-120 18 - RTD Custom $ref: /schemas/types.yaml#/definitions/uint32 minimum: 10 maximum: 18 adi,rsense-handle: description: Associated sense resistor sensor. $ref: /schemas/types.yaml#/definitions/phandle adi,number-of-wires: description: Number of wires used by the RTD. 5 means 4 wires with Kelvin sense resistor. $ref: /schemas/types.yaml#/definitions/uint32 enum: [2, 3, 4, 5] default: 2 adi,rsense-share: description: Whether to enable sense resistor sharing, where one sense resistor is used by multiple sensors. type: boolean adi,excitation-current-microamp: description: Excitation current applied to the RTD. enum: [5, 10, 25, 50, 100, 250, 500, 1000] default: 5 adi,rtd-curve: description: | RTD curve and the corresponding Callendar-VanDusen constants. 0 - European 1 - American 2 - Japanese 3 - ITS-90 $ref: /schemas/types.yaml#/definitions/uint32 minimum: 0 maximum: 3 default: 0 adi,custom-rtd: description: Used for digitizing custom RTDs. See Page 62 of the datasheet. $ref: /schemas/types.yaml#/definitions/uint64-matrix minItems: 3 maxItems: 64 items: items: - description: Resistance point in uOhms. - description: Temperature point in uK. required: - adi,rsense-handle allOf: - if: properties: adi,number-of-wires: const: 4 then: properties: adi,current-rotate: description: Whether to enable excitation current rotation to automatically remove parasitic thermocouple effects. type: boolean dependencies: adi,current-rotate: [ "adi,rsense-share" ] - if: properties: adi,sensor-type: const: 18 then: required: - adi,custom-rtd "^thermistor@": $ref: '#/$defs/sensor-node' unevaluatedProperties: false description: Thermistor sensor. properties: adi,sensor-type: description: 19 - Thermistor 44004/44033 2.252kohm at 25°C 20 - Thermistor 44005/44030 3kohm at 25°C 21 - Thermistor 44007/44034 5kohm at 25°C 22 - Thermistor 44006/44031 10kohm at 25°C 23 - Thermistor 44008/44032 30kohm at 25°C 24 - Thermistor YSI 400 2.252kohm at 25°C 25 - Thermistor Spectrum 1003k 1kohm 26 - Thermistor Custom Steinhart-Hart 27 - Custom Thermistor $ref: /schemas/types.yaml#/definitions/uint32 minimum: 19 maximum: 27 adi,rsense-handle: description: Associated sense resistor sensor. $ref: /schemas/types.yaml#/definitions/phandle adi,single-ended: description: Whether the sensor is single-ended. type: boolean adi,rsense-share: description: Whether to enable sense resistor sharing, where one sense resistor is used by multiple sensors. type: boolean adi,current-rotate: description: Whether to enable excitation current rotation to automatically remove parasitic thermocouple effects. type: boolean adi,excitation-current-nanoamp: description: Excitation current applied to the thermistor. 0 sets the sensor in auto-range mode. enum: [0, 250, 500, 1000, 5000, 10000, 25000, 50000, 100000, 250000, 500000, 1000000] default: 0 adi,custom-thermistor: description: Used for digitizing custom thermistors. See Page 65 of the datasheet. $ref: /schemas/types.yaml#/definitions/uint64-matrix minItems: 3 maxItems: 64 items: items: - description: Resistance point in uOhms. - description: Temperature point in uK. adi,custom-steinhart: description: Steinhart-Hart coefficients in raw format, used for digitizing custom thermistors. See Page 68 of the datasheet. $ref: /schemas/types.yaml#/definitions/uint32-array minItems: 6 maxItems: 6 required: - adi,rsense-handle dependencies: adi,current-rotate: [ "adi,rsense-share" ] allOf: - if: properties: adi,sensor-type: const: 26 then: properties: adi,excitation-current-nanoamp: enum: [250, 500, 1000, 5000, 10000, 25000, 50000, 100000, 250000, 500000, 1000000] default: 1000 required: - adi,custom-steinhart - if: properties: adi,sensor-type: const: 27 then: properties: adi,excitation-current-nanoamp: enum: [250, 500, 1000, 5000, 10000, 25000, 50000, 100000, 250000, 500000, 1000000] default: 1000 required: - adi,custom-thermistor "^adc@": $ref: '#/$defs/sensor-node' unevaluatedProperties: false description: Direct ADC sensor. properties: adi,sensor-type: description: Sensor type for direct ADC sensors. $ref: /schemas/types.yaml#/definitions/uint32 const: 30 adi,single-ended: description: Whether the sensor is single-ended. type: boolean "^temp@": $ref: '#/$defs/sensor-node' unevaluatedProperties: false description: Active analog temperature sensor. properties: adi,sensor-type: description: Sensor type for active analog temperature sensors. $ref: /schemas/types.yaml#/definitions/uint32 const: 31 adi,single-ended: description: Whether the sensor is single-ended. type: boolean adi,custom-temp: description: Used for digitizing active analog temperature sensors. See Page 67 of the LTM2985 datasheet. $ref: /schemas/types.yaml#/definitions/uint64-matrix minItems: 3 maxItems: 64 items: items: - description: Voltage point in nV, signed. - description: Temperature point in uK. required: - adi,custom-temp "^rsense@": $ref: '#/$defs/sensor-node' unevaluatedProperties: false description: Sense resistor sensor. properties: reg: minimum: 2 maximum: 20 adi,sensor-type: description: Sensor type sense resistor sensors. $ref: /schemas/types.yaml#/definitions/uint32 const: 29 adi,rsense-val-milli-ohms: description: Value of the sense resistor. required: - adi,rsense-val-milli-ohms required: - compatible - reg - interrupts additionalProperties: false allOf: - if: properties: compatible: contains: enum: - adi,ltc2983 - adi,ltc2984 then: patternProperties: "^temp@": false examples: - | #include spi { #address-cells = <1>; #size-cells = <0>; temperature-sensor@0 { compatible = "adi,ltc2983"; reg = <0>; #address-cells = <1>; #size-cells = <0>; interrupts = <20 IRQ_TYPE_EDGE_RISING>; interrupt-parent = <&gpio>; thermocouple@18 { reg = <18>; adi,sensor-type = <8>; //Type B adi,sensor-oc-current-microamp = <10>; adi,cold-junction-handle = <&diode5>; }; diode5: diode@5 { reg = <5>; adi,sensor-type = <28>; }; rsense2: rsense@2 { reg = <2>; adi,sensor-type = <29>; adi,rsense-val-milli-ohms = <1200000>; //1.2Kohms }; rtd@14 { reg = <14>; adi,sensor-type = <15>; //PT1000 /*2-wire, internal gnd, no current rotation*/ adi,number-of-wires = <2>; adi,rsense-share; adi,excitation-current-microamp = <500>; adi,rsense-handle = <&rsense2>; }; adc@10 { reg = <10>; adi,sensor-type = <30>; adi,single-ended; }; thermistor@12 { reg = <12>; adi,sensor-type = <26>; //Steinhart adi,rsense-handle = <&rsense2>; adi,custom-steinhart = <0x00f371ec 0x12345678 0x2c0f8733 0x10018c66 0xa0feaccd 0x90021d99>; //6 entries }; thermocouple@20 { reg = <20>; adi,sensor-type = <9>; //custom thermocouple adi,single-ended; adi,custom-thermocouple = /bits/ 64 <(-50220000) 0>, /bits/ 64 <(-30200000) 99100000>, /bits/ 64 <(-5300000) 135400000>, /bits/ 64 <0 273150000>, /bits/ 64 <40200000 361200000>, /bits/ 64 <55300000 522100000>, /bits/ 64 <88300000 720300000>, /bits/ 64 <132200000 811200000>, /bits/ 64 <188700000 922500000>, /bits/ 64 <460400000 1000000000>; //10 pairs }; }; }; ...