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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 | # 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 Multi-sensor Temperature system maintainers: - Nuno Sá <nuno.sa@analog.com> description: | Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System https://www.analog.com/media/en/technical-documentation/data-sheets/2983fc.pdf properties: compatible: enum: - adi,ltc2983 reg: maxItems: 1 interrupts: maxItems: 1 adi,mux-delay-config-us: description: The LTC2983 performs 2 or 3 internal conversion cycles per temperature result. Each conversion cycle is performed with different excitation and input multiplexer configurations. Prior to each conversion, these excitation circuits and input switch configurations are changed and an internal 1ms delay ensures settling prior to the conversion cycle in most cases. An extra delay can be configured using this property. The value is rounded to nearest 100us. maximum: 255 adi,filter-notch-freq: description: Set's the default setting of the digital filter. The default is simultaneous 50/60Hz rejection. 0 - 50/60Hz rejection 1 - 60Hz rejection 2 - 50Hz rejection $ref: /schemas/types.yaml#/definitions/uint32 minimum: 0 maximum: 2 '#address-cells': const: 1 '#size-cells': const: 0 patternProperties: "@([1-9]|1[0-9]|20)$": type: object properties: reg: description: The channel number. It can be connected to one of the 20 channels of the device. minimum: 1 maximum: 20 adi,sensor-type: description: Identifies the type of sensor connected to the device. $ref: /schemas/types.yaml#/definitions/uint32 required: - reg - adi,sensor-type "^thermocouple@": type: object description: Represents a thermocouple sensor which is connected to one of the device channels. 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: Boolean property which set's the thermocouple as single-ended. type: boolean adi,sensor-oc-current-microamp: description: This property set's the pulsed current value applied during open-circuit detect. enum: [10, 100, 500, 1000] adi,cold-junction-handle: description: Phandle which points to a sensor object responsible for measuring the thermocouple cold junction temperature. $ref: "/schemas/types.yaml#/definitions/phandle" adi,custom-thermocouple: description: This is a table, where each entry should be a pair of voltage(mv)-temperature(K). The entries must be given in nv and uK so that, the original values must be multiplied by 1000000. For more details look at table 69 and 70. Note should be signed, but dtc doesn't currently maintain the sign. $ref: /schemas/types.yaml#/definitions/uint64-matrix minItems: 3 maxItems: 64 items: minItems: 2 maxItems: 2 "^diode@": type: object description: Represents a diode sensor which is connected to one of the device channels. properties: adi,sensor-type: description: Identifies the sensor as a diode. $ref: /schemas/types.yaml#/definitions/uint32 const: 28 adi,single-ended: description: Boolean property which set's the diode as single-ended. type: boolean adi,three-conversion-cycles: description: Boolean property which set's three conversion cycles removing parasitic resistance effects between the LTC2983 and the diode. type: boolean adi,average-on: description: Boolean property which enables a running average of the diode temperature reading. This reduces 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: This property controls the magnitude of the excitation current applied to the diode. Depending on the number of conversions cycles, this property will assume different predefined values on each cycle. Just set the value of the first cycle (1l). enum: [10, 20, 40, 80] adi,ideal-factor-value: description: This property sets the diode ideality factor. The real value must be multiplied by 1000000 to remove the fractional part. For more information look at table 20 of the datasheet. $ref: /schemas/types.yaml#/definitions/uint32 "^rtd@": type: object description: Represents a rtd sensor which is connected to one of the device channels. 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: Phandle pointing to a rsense object associated with this RTD. $ref: "/schemas/types.yaml#/definitions/phandle" adi,number-of-wires: description: Identifies the number of wires used by the RTD. Setting this property to 5 means 4 wires with Kelvin Rsense. $ref: /schemas/types.yaml#/definitions/uint32 enum: [2, 3, 4, 5] adi,rsense-share: description: Boolean property which enables Rsense sharing, where one sense resistor is used for multiple 2-, 3-, and/or 4-wire RTDs. type: boolean adi,current-rotate: description: Boolean property which enables excitation current rotation to automatically remove parasitic thermocouple effects. Note that this property is not allowed for 2- and 3-wire RTDs. type: boolean adi,excitation-current-microamp: description: This property controls the magnitude of the excitation current applied to the RTD. enum: [5, 10, 25, 50, 100, 250, 500, 1000] adi,rtd-curve: description: This property set the RTD curve used and the corresponding Callendar-VanDusen constants. Look at table 30 of the datasheet. $ref: /schemas/types.yaml#/definitions/uint32 minimum: 0 maximum: 3 adi,custom-rtd: description: This is a table, where each entry should be a pair of resistance(ohm)-temperature(K). The entries added here are in uohm and uK. For more details values look at table 74 and 75. $ref: /schemas/types.yaml#/definitions/uint64-matrix items: minItems: 3 maxItems: 64 items: minItems: 2 maxItems: 2 required: - adi,rsense-handle dependencies: adi,current-rotate: [ "adi,rsense-share" ] "^thermistor@": type: object description: Represents a thermistor sensor which is connected to one of the device channels. 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: Phandle pointing to a rsense object associated with this thermistor. $ref: "/schemas/types.yaml#/definitions/phandle" adi,single-ended: description: Boolean property which set's the thermistor as single-ended. type: boolean adi,rsense-share: description: Boolean property which enables Rsense sharing, where one sense resistor is used for multiple thermistors. Note that this property is ignored if adi,single-ended is set. type: boolean adi,current-rotate: description: Boolean property which enables excitation current rotation to automatically remove parasitic thermocouple effects. type: boolean adi,excitation-current-nanoamp: description: This property controls the magnitude of the excitation current applied to the thermistor. Value 0 set's the sensor in auto-range mode. $ref: /schemas/types.yaml#/definitions/uint32 enum: [0, 250, 500, 1000, 5000, 10000, 25000, 50000, 100000, 250000, 500000, 1000000] adi,custom-thermistor: description: This is a table, where each entry should be a pair of resistance(ohm)-temperature(K). The entries added here are in uohm and uK only for custom thermistors. For more details look at table 78 and 79. $ref: /schemas/types.yaml#/definitions/uint64-matrix minItems: 3 maxItems: 64 items: minItems: 2 maxItems: 2 adi,custom-steinhart: description: Steinhart-Hart coefficients are also supported and can be programmed into the device memory using this property. For Steinhart sensors the coefficients are given in the raw format. Look at table 82 for more information. $ref: /schemas/types.yaml#/definitions/uint32-array items: minItems: 6 maxItems: 6 required: - adi,rsense-handle dependencies: adi,current-rotate: [ "adi,rsense-share" ] "^adc@": type: object description: Represents a channel which is being used as a direct adc. properties: adi,sensor-type: description: Identifies the sensor as a direct adc. $ref: /schemas/types.yaml#/definitions/uint32 const: 30 adi,single-ended: description: Boolean property which set's the adc as single-ended. type: boolean "^rsense@": type: object description: Represents a rsense which is connected to one of the device channels. Rsense are used by thermistors and RTD's. properties: reg: minimum: 2 maximum: 20 adi,sensor-type: description: Identifies the sensor as a rsense. $ref: /schemas/types.yaml#/definitions/uint32 const: 29 adi,rsense-val-milli-ohms: description: Sets the value of the sense resistor. Look at table 20 of the datasheet for information. required: - adi,rsense-val-milli-ohms required: - compatible - reg - interrupts additionalProperties: false examples: - | #include <dt-bindings/interrupt-controller/irq.h> spi { #address-cells = <1>; #size-cells = <0>; sensor_ltc2983: ltc2983@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>, <(-30200000) 99100000>, <(-5300000) 135400000>, <0 273150000>, <40200000 361200000>, <55300000 522100000>, <88300000 720300000>, <132200000 811200000>, <188700000 922500000>, <460400000 1000000000>; //10 pairs }; }; }; ... |