From: Liam Beguin <lvb@xxxxxxxxxx> An ADC is often used to measure other quantities indirectly. This binding describe one cases, the measurement of a temperature through a voltage sense amplifier such as the LTC2997. Signed-off-by: Liam Beguin <lvb@xxxxxxxxxx> --- .../iio/afe/temperature-sense-amplifier.yaml | 55 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 56 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..015413cbffbc --- /dev/null +++ b/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml @@ -0,0 +1,55 @@ +# 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 IC such as + the LTC2997, 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 + + alpha-micro-volts-per-degree: + description: | + Output voltage gain of the temperature IC. + + use-kelvin-scale: + type: boolean + description: | + Boolean indicating if alpha uses Kelvin degrees instead of Celsius. + +additionalProperties: false +required: + - compatible + - io-channels + - alpha-micro-volts-per-degree + +examples: + - | + znq_temp: iio-rescale0 { + compatible = "temperature-sense-amplifier"; + #io-channel-cells = <1>; + io-channels = <&temp_adc 3>; + + use-kelvin-scale; + alpha-micro-volts-per-degree = <4000>; + }; + +... diff --git a/MAINTAINERS b/MAINTAINERS index 0eb7fcd94b66..f224bd8e6125 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8721,6 +8721,7 @@ 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/temperature-sense-current.yaml F: Documentation/devicetree/bindings/iio/afe/temperature-sense-rtd.yaml F: Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml -- 2.30.1.489.g328c10930387
