From: Liam Beguin <lvb@xxxxxxxxxx> An ADC is often used to measure other quantities indirectly. This binding describe such a use case, the measurement of a temperature through an analog front end connected to a voltage channel. Signed-off-by: Liam Beguin <lvb@xxxxxxxxxx> --- .../iio/afe/temperature-sense-amplifier.yaml | 57 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 58 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml diff --git a/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml b/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml new file mode 100644 index 000000000000..08f97f052a91 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml @@ -0,0 +1,57 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/afe/temperature-sense-amplifier.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Temperature Sense Amplifier + +maintainers: + - Liam Beguin <lvb@xxxxxxxxxx> + +description: | + When an io-channel measures the output voltage of a temperature analog front + end such as an RTD (resistance thermometer) or a temperature to current + sensor, the interesting measurement is almost always the corresponding + temperature, not the voltage output. This binding describes such a circuit. + +properties: + compatible: + const: temperature-sense-amplifier + + io-channels: + maxItems: 1 + description: | + Channel node of a voltage io-channel. + + '#io-channel-cells': + const: 1 + + sense-gain-mult: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Amplifier gain multiplier. The default is <1>. + + sense-gain-div: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Amplifier gain divider. The default is <1>. + + sense-offset-millicelsius: + description: Amplifier offset. The default is <0>. + +additionalProperties: false +required: + - compatible + - io-channels + +examples: + - | + pt1000_1: temperature-sensor { + compatible = "temperature-sense-amplifier"; + #io-channel-cells = <1>; + io-channels = <&temp_adc 3>; + + sense-gain-mult = <1000000>; + sense-gain-div = <3908>; + sense-offset-millicelsius = <(-255885)>; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index e679d422b472..4f7b4ee9f19b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8887,6 +8887,7 @@ L: linux-iio@xxxxxxxxxxxxxxx S: Maintained F: Documentation/devicetree/bindings/iio/afe/current-sense-amplifier.yaml F: Documentation/devicetree/bindings/iio/afe/current-sense-shunt.yaml +F: Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml F: Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml F: drivers/iio/afe/iio-rescale.c -- 2.30.1.489.g328c10930387
