@@ -26,25 +26,25 @@ properties:
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.
+ 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:
- Set's the default setting of the digital filter. The default is
- simultaneous 50/60Hz rejection.
+ Notch frequency of the digital filter.
0 - 50/60Hz rejection
1 - 60Hz rejection
2 - 50Hz rejection
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 2
+ default: 0
'#address-cells':
const: 1
@@ -53,19 +53,19 @@ properties:
const: 0
patternProperties:
- "@([1-9]|1[0-9]|20)$":
+ "@([0-9a-f]+)$":
type: object
-
+ description: Sensor.
properties:
reg:
description:
- The channel number. It can be connected to one of the 20 channels of
- the device.
- minimum: 1
+ Channel number. Connects the sensor to the channel with this number
+ of the device.
+ minimum: 2
maximum: 20
adi,sensor-type:
- description: Identifies the type of sensor connected to the device.
+ description: Type of sensor connected to the device.
$ref: /schemas/types.yaml#/definitions/uint32
required:
@@ -74,10 +74,7 @@ patternProperties:
"^thermocouple@":
type: object
- description:
- Represents a thermocouple sensor which is connected to one of the device
- channels.
-
+ description: Thermocouple sensor.
properties:
adi,sensor-type:
description: |
@@ -95,87 +92,104 @@ patternProperties:
maximum: 9
adi,single-ended:
- description:
- Boolean property which set's the thermocouple as single-ended.
+ description: Whether the sensor is single-ended.
type: boolean
adi,sensor-oc-current-microamp:
- description:
- This property set's the pulsed current value applied during
- open-circuit detect.
+ description: Pulsed current value applied during open-circuit detect.
enum: [10, 100, 500, 1000]
+ default: 10
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"
+ Sensor 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.
+ Used for digitizing custom thermocouples.
+ See Page 59 of the datasheet.
$ref: /schemas/types.yaml#/definitions/uint64-matrix
minItems: 3
maxItems: 64
items:
- minItems: 2
- maxItems: 2
+ items:
+ - description: Voltage point in nV, signed.
+ - description: Temperature point in uK.
+
+ allOf:
+ - if:
+ properties:
+ adi,single-ended:
+ const: true
+ then:
+ properties:
+ reg:
+ minimum: 1
+ - if:
+ properties:
+ adi,sensor-type:
+ const: 9
+ then:
+ required:
+ - adi,custom-thermocouple
"^diode@":
type: object
- description:
- Represents a diode sensor which is connected to one of the device
- channels.
-
+ description: Diode sensor.
properties:
adi,sensor-type:
- description: Identifies the sensor as a diode.
+ description: Sensor type for diodes.
$ref: /schemas/types.yaml#/definitions/uint32
const: 28
adi,single-ended:
- description: Boolean property which set's the diode as single-ended.
+ description: Whether the sensor is 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.
+ Whether to use three conversion cycles to remove parasitic
+ resistance between the device 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.
+ 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:
- 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).
+ 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:
- 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.
+ Diode ideality factor.
+ Set this property to 1000000 times the real value.
$ref: /schemas/types.yaml#/definitions/uint32
+ default: 0
+
+ allOf:
+ - if:
+ properties:
+ adi,single-ended:
+ const: true
+ then:
+ properties:
+ reg:
+ minimum: 1
"^rtd@":
type: object
- description:
- Represents a rtd sensor which is connected to one of the device channels.
-
+ description: RTD sensor.
properties:
reg:
minimum: 2
@@ -197,56 +211,57 @@ patternProperties:
maximum: 18
adi,rsense-handle:
- description:
- Phandle pointing to a rsense object associated with this RTD.
- $ref: "/schemas/types.yaml#/definitions/phandle"
+ description: Associated sense resistor sensor.
+ $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.
+ 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:
- Boolean property which enables Rsense sharing, where one sense
- resistor is used for multiple 2-, 3-, and/or 4-wire RTDs.
+ Whether to enable sense resistor sharing, where one sense
+ resistor is used by multiple sensors.
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.
+ Whether to enable excitation current rotation to automatically
+ remove parasitic thermocouple effects.
type: boolean
adi,excitation-current-microamp:
- description:
- This property controls the magnitude of the excitation current
- applied to the RTD.
+ description: Excitation current applied to the RTD.
enum: [5, 10, 25, 50, 100, 250, 500, 1000]
+ default: 5
adi,rtd-curve:
description:
- This property set the RTD curve used and the corresponding
- Callendar-VanDusen constants. Look at table 30 of the datasheet.
+ 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:
- 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.
+ Used for digitizing custom RTDs.
+ See Page 62 of the datasheet.
$ref: /schemas/types.yaml#/definitions/uint64-matrix
+ minItems: 3
+ maxItems: 64
items:
- minItems: 3
- maxItems: 64
items:
- minItems: 2
- maxItems: 2
+ - description: Resistance point in uOhms.
+ - description: Temperature point in uK.
required:
- adi,rsense-handle
@@ -254,12 +269,25 @@ patternProperties:
dependencies:
adi,current-rotate: [ "adi,rsense-share" ]
+ allOf:
+ - if:
+ properties:
+ adi,number-of-wires:
+ enum: [2, 3]
+ then:
+ properties:
+ adi,current-rotate: false
+ - if:
+ properties:
+ adi,sensor-type:
+ const: 18
+ then:
+ required:
+ - adi,custom-rtd
+
"^thermistor@":
type: object
- description:
- Represents a thermistor sensor which is connected to one of the device
- channels.
-
+ description: Thermistor sensor.
properties:
adi,sensor-type:
description:
@@ -277,61 +305,54 @@ patternProperties:
maximum: 27
adi,rsense-handle:
- description:
- Phandle pointing to a rsense object associated with this
- thermistor.
- $ref: "/schemas/types.yaml#/definitions/phandle"
+ description: Associated sense resistor sensor.
+ $ref: /schemas/types.yaml#/definitions/phandle
adi,single-ended:
- description:
- Boolean property which set's the thermistor as single-ended.
+ description: Whether the sensor is 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.
+ Whether to enable sense resistor sharing, where one sense
+ resistor is used by multiple sensors.
type: boolean
adi,current-rotate:
description:
- Boolean property which enables excitation current rotation to
- automatically remove parasitic thermocouple effects.
+ Whether to enable 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.
+ Excitation current applied to the thermistor.
+ 0 sets 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]
+ default: 0
+
+ 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
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.
+ Used for digitizing custom thermistors.
+ See Page 65 of the datasheet.
$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
+ items:
+ - description: Resistance point in uOhms.
+ - description: Temperature point in uK.
required:
- adi,rsense-handle
@@ -339,40 +360,74 @@ patternProperties:
dependencies:
adi,current-rotate: [ "adi,rsense-share" ]
+ allOf:
+ - if:
+ properties:
+ adi,single-ended:
+ const: true
+ then:
+ properties:
+ reg:
+ minimum: 1
+ - if:
+ properties:
+ adi,sensor-type:
+ const: 26
+ then:
+ properties:
+ adi,excitation-current-nanoamp:
+ default: 1000
+ required:
+ - adi,custom-steinhart
+ - if:
+ properties:
+ adi,sensor-type:
+ const: 27
+ then:
+ properties:
+ adi,excitation-current-nanoamp:
+ default: 1000
+ required:
+ - adi,custom-thermistor
+
"^adc@":
type: object
- description: Represents a channel which is being used as a direct adc.
-
+ description: Direct ADC sensor.
properties:
adi,sensor-type:
- description: Identifies the sensor as a direct adc.
+ description: Sensor type for direct ADC sensors.
$ref: /schemas/types.yaml#/definitions/uint32
const: 30
adi,single-ended:
- description: Boolean property which set's the adc as single-ended.
+ description: Whether the sensor is single-ended.
type: boolean
+ allOf:
+ - if:
+ properties:
+ adi,single-ended:
+ const: true
+ then:
+ properties:
+ reg:
+ minimum: 1
+
"^rsense@":
type: object
- description:
- Represents a rsense which is connected to one of the device channels.
- Rsense are used by thermistors and RTD's.
-
+ description: Sense resistor sensor.
properties:
reg:
minimum: 2
maximum: 20
adi,sensor-type:
- description: Identifies the sensor as a rsense.
+ description: Sensor type sense resistor sensors.
$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.
+ description: Value of the sense resistor.
required:
- adi,rsense-val-milli-ohms
@@ -391,7 +446,7 @@ examples:
#address-cells = <1>;
#size-cells = <0>;
- sensor_ltc2983: ltc2983@0 {
+ temp@0 {
compatible = "adi,ltc2983";
reg = <0>;