On Sat, May 29, 2021 at 08:59:16PM -0400, Liam Beguin wrote: > 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 current sense amplifier (such as an AD590) and a sense resistor. > > Signed-off-by: Liam Beguin <lvb@xxxxxxxxxx> > --- > .../iio/afe/temperature-sense-current.yaml | 61 +++++++++++++++++++ > MAINTAINERS | 1 + > 2 files changed, 62 insertions(+) > create mode 100644 Documentation/devicetree/bindings/iio/afe/temperature-sense-current.yaml > > diff --git a/Documentation/devicetree/bindings/iio/afe/temperature-sense-current.yaml b/Documentation/devicetree/bindings/iio/afe/temperature-sense-current.yaml > new file mode 100644 > index 000000000000..1bac74486102 > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/afe/temperature-sense-current.yaml > @@ -0,0 +1,61 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/iio/afe/temperature-sense-current.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Temperature Sense Current > + > +maintainers: > + - Liam Beguin <lvb@xxxxxxxxxx> > + > +description: | > + When an io-channel measures the output voltage for a temperature current > + sense amplifier such as the AD950, the interesting measurement is almost > + always the corresponding temperature, not the voltage output. > + This binding describes such a circuit. > + > +properties: > + compatible: > + const: temperature-sense-current > + > + io-channels: > + maxItems: 1 > + description: | > + Channel node of a voltage io-channel. > + > + '#io-channel-cells': > + const: 1 Belongs in provider unless this is a consumer and provider. > + > + sense-resistor-ohms: > + description: The sense resistance. > + > + alpha-micro-amps-per-degree: > + description: | > + Linear output current gain of the temperature IC. > + > + use-kelvin-scale: > + type: boolean > + description: | > + Boolean indicating if alpha uses Kelvin degrees instead of Celsius. > + > +additionalProperties: false blank line > +required: > + - compatible > + - io-channels > + - sense-resistor-ohms > + - alpha-micro-amps-per-degree > + > +examples: > + - | > + ad590: iio-rescale0 { > + compatible = "temperature-sense-current"; > + #io-channel-cells = <1>; > + io-channels = <&temp_adc 2>; > + > + sense-resistor-ohms = <8060>; > + use-kelvin-scale; > + alpha-micro-amps-per-degree = <1>; > + }; > + > +... > diff --git a/MAINTAINERS b/MAINTAINERS > index a7279af85adb..0eb7fcd94b66 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-current.yaml > F: Documentation/devicetree/bindings/iio/afe/temperature-sense-rtd.yaml > F: Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml > F: drivers/iio/afe/iio-rescale.c > -- > 2.30.1.489.g328c10930387
