Add support for the following parts:
* LTC2984
* LTC2986
* LTM2985
The LTC2984 is a variant of the LTC2983 with EEPROM.
The LTC2986 is a variant of the LTC2983 with only 10 channels,
EEPROM and support for active analog temperature sensors.
The LTM2985 is software-compatible with the LTC2986.
Also, make bulk write buffer DMA-safe.
V1 -> V2:
* add Fixes tag
* add patch that fixes the regmap_bulk_write() call with stack allocated
buffer
* add patch that refines the binding in preperation for adding new
parts support to it
* do not use stack allocated buffer for writing the EEPROM key
V2 -> V3:
* drop minItems if equal to maxItems
* drop adi,single-ended conditions because of recent dtschema
restrictions (even though they're valid in jsonschema and the last
dtschema tag)
* drop "allocate iio channels once" patch since it's been picked as a fix
Cosmin Tanislav (4):
iio: temperature: ltc2983: make bulk write buffer DMA-safe
dt-bindings: iio: temperature: ltc2983: refine
dt-bindings: iio: temperature: ltc2983: support more parts
iio: temperature: ltc2983: support more parts
.../bindings/iio/temperature/adi,ltc2983.yaml | 329 +++++++++++-------
drivers/iio/temperature/ltc2983.c | 193 +++++++++-
2 files changed, 380 insertions(+), 142 deletions(-)
--
2.38.1
From: Cosmin Tanislav <[email protected]>
* make sure addresses are represented as hex
* add note about wrong unit value for adi,mux-delay-config-us
* simplify descriptions
* add descriptions for the items of custom sensor tables
* add default property values where applicable
* use conditionals to extend minimum reg value
for single ended sensors
* remove " around phandle schema $ref
* remove label from example and use generic temperature
sensor name
Signed-off-by: Cosmin Tanislav <[email protected]>
---
.../bindings/iio/temperature/adi,ltc2983.yaml | 270 ++++++++++--------
1 file changed, 144 insertions(+), 126 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
index 722781aa4697..a878fd84636f 100644
--- a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
+++ b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
@@ -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.
+ Channel number. Connects the sensor to the channel with this number
+ of the device.
minimum: 1
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 +92,86 @@ 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,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
"^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 +193,57 @@ 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 +251,25 @@ 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 +287,53 @@ 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
+ 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 +341,56 @@ patternProperties:
dependencies:
adi,current-rotate: [ "adi,rsense-share" ]
+ allOf:
+ - 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
"^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 +409,7 @@ examples:
#address-cells = <1>;
#size-cells = <0>;
- sensor_ltc2983: ltc2983@0 {
+ temp@0 {
compatible = "adi,ltc2983";
reg = <0>;
--
2.38.1
On Tue, Oct 25, 2022 at 11:18:40AM +0300, Cosmin Tanislav wrote:
> From: Cosmin Tanislav <[email protected]>
'refine' is not a great subject. That's due to doing many things in 1
patch. I'd at least split out all the 'description' changes from actual
schema changes to separate patches.
>
> * make sure addresses are represented as hex
> * add note about wrong unit value for adi,mux-delay-config-us
> * simplify descriptions
> * add descriptions for the items of custom sensor tables
> * add default property values where applicable
> * use conditionals to extend minimum reg value
> for single ended sensors
> * remove " around phandle schema $ref
> * remove label from example and use generic temperature
> sensor name
>
> Signed-off-by: Cosmin Tanislav <[email protected]>
> ---
> .../bindings/iio/temperature/adi,ltc2983.yaml | 270 ++++++++++--------
> 1 file changed, 144 insertions(+), 126 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
> index 722781aa4697..a878fd84636f 100644
> --- a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
> +++ b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
> @@ -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.
You need '|' for the block if you want to retain formatting.
> 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]+)$":
Before 1-20 was supported which matched 'reg' and now there is no limit.
However, you did fix that the unit address should be hex. So it should
be:
"@([1-9a-f]|1[0-4])$"
> type: object
> -
> + description: Sensor.
> properties:
> reg:
> description:
> - The channel number. It can be connected to one of the 20 channels of
> - the device.
> + Channel number. Connects the sensor to the channel with this number
> + of the device.
> minimum: 1
> 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.
> -
Keep the blank line.
> + description: Thermocouple sensor.
> properties:
> adi,sensor-type:
> description: |
> @@ -95,87 +92,86 @@ 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,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
>
> "^rtd@":
> type: object
> - description:
> - Represents a rtd sensor which is connected to one of the device channels.
> -
> + description: RTD sensor.
Keep the blank line. And any other case.
> properties:
> reg:
> minimum: 2
> @@ -197,56 +193,57 @@ 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 +251,25 @@ patternProperties:
> dependencies:
> adi,current-rotate: [ "adi,rsense-share" ]
>
> + allOf:
> + - if:
> + properties:
> + adi,number-of-wires:
> + enum: [2, 3]
This is also true if adi,number-of-wires is not present. You need
'required' if that's not ensured already. (Unless this was intentional)
> + 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 +287,53 @@ 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
> + 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 +341,56 @@ patternProperties:
> dependencies:
> adi,current-rotate: [ "adi,rsense-share" ]
>
> + allOf:
> + - 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
>
> "^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 +409,7 @@ examples:
> #address-cells = <1>;
> #size-cells = <0>;
>
> - sensor_ltc2983: ltc2983@0 {
> + temp@0 {
> compatible = "adi,ltc2983";
> reg = <0>;
>
> --
> 2.38.1
>
>
On Wed, 2022-10-26 at 15:03 -0500, Rob Herring wrote:
> On Tue, Oct 25, 2022 at 11:18:40AM +0300, Cosmin Tanislav wrote:
> > From: Cosmin Tanislav <[email protected]>
>
> 'refine' is not a great subject. That's due to doing many things in 1
> patch. I'd at least split out all the 'description' changes from
> actual
> schema changes to separate patches.
>
> >
> > * make sure addresses are represented as hex
> > * add note about wrong unit value for adi,mux-delay-config-us
> > * simplify descriptions
> > * add descriptions for the items of custom sensor tables
> > * add default property values where applicable
> > * use conditionals to extend minimum reg value
> > for single ended sensors
> > * remove " around phandle schema $ref
> > * remove label from example and use generic temperature
> > sensor name
> >
> > Signed-off-by: Cosmin Tanislav <[email protected]>
> > ---
> > .../bindings/iio/temperature/adi,ltc2983.yaml | 270 ++++++++++----
> > ----
> > 1 file changed, 144 insertions(+), 126 deletions(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yam
> > l
> > b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yam
> > l
> > index 722781aa4697..a878fd84636f 100644
> > ---
> > a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yam
> > l
> > +++
> > b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yam
> > l
> > @@ -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.
>
> You need '|' for the block if you want to retain formatting.
>
> > 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]+)$":
>
> Before 1-20 was supported which matched 'reg' and now there is no
> limit.
> However, you did fix that the unit address should be hex. So it
> should
> be:
>
> "@([1-9a-f]|1[0-4])$"
>
The address is supposed to match reg, isn't it?
I made it unlimited because there's no way to modify the node name of
the patternProperty conditionally, so parts with 10 channels will be
invalid anyway.
> > type: object
> > -
> > + description: Sensor.
> > properties:
> > reg:
> > description:
> > - The channel number. It can be connected to one of the 20
> > channels of
> > - the device.
> > + Channel number. Connects the sensor to the channel with
> > this number
> > + of the device.
> > minimum: 1
> > 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.
> > -
>
> Keep the blank line.
>
> > + description: Thermocouple sensor.
> > properties:
> > adi,sensor-type:
> > description: |
> > @@ -95,87 +92,86 @@ 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,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
> >
> > "^rtd@":
> > type: object
> > - description:
> > - Represents a rtd sensor which is connected to one of the
> > device channels.
> > -
> > + description: RTD sensor.
>
> Keep the blank line. And any other case.
>
> > properties:
> > reg:
> > minimum: 2
> > @@ -197,56 +193,57 @@ 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 +251,25 @@ patternProperties:
> > dependencies:
> > adi,current-rotate: [ "adi,rsense-share" ]
> >
> > + allOf:
> > + - if:
> > + properties:
> > + adi,number-of-wires:
> > + enum: [2, 3]
>
> This is also true if adi,number-of-wires is not present. You need
> 'required' if that's not ensured already. (Unless this was
> intentional)
>
> > + 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 +287,53 @@ 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
> > + 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 +341,56 @@ patternProperties:
> > dependencies:
> > adi,current-rotate: [ "adi,rsense-share" ]
> >
> > + allOf:
> > + - 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
> >
> > "^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 +409,7 @@ examples:
> > #address-cells = <1>;
> > #size-cells = <0>;
> >
> > - sensor_ltc2983: ltc2983@0 {
> > + temp@0 {
> > compatible = "adi,ltc2983";
> > reg = <0>;
> >
> > --
> > 2.38.1
> >
> >