Re: [PATCH RFC v2 2/3] dt-bindings: iio: adc: Add excitation current sources properties

[David Lechner]

On 6/22/26 2:30 PM, Kurt Borja wrote:
> Some ADCs incorporate current sources that provide excitation current to
> resistive temperature devices (RTDs), thermistors, diodes and other
> resistive sensors that require constant current biasing.
> 
> Signed-off-by: Kurt Borja <kuurtb@xxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/iio/adc/adc.yaml | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml
> index fdad6b8276c934c..160a8cfa9842a86 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml
> @@ -86,6 +86,25 @@ properties:
>        source. If two values are provided, the first one corresponds to the
>        positive source and the second to the negative source.
>  
> +  excitation-channels:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description:
> +      Excitation current sources provide current to resistive temperature
> +      devices (RTDs), thermistors, diodes and other resistive sensors that
> +      require constant current biasing.
> +
> +      This array describes the mux configuration of the excitation current
> +      sources.
> +
> +  excitation-current-microamp:

As seen in adi,ltc2983.yaml, this actually needs to be nanoamp to be able
to be flexible for all parts.

> +    description:
> +      Excitation current sources provide current to resistive temperature
> +      devices (RTDs), thermistors, diodes and other resistive sensors that
> +      require constant current biasing.
> +
> +      This array describes the current configuration of the excitation current
> +      sources or the single matched current for all sources.
> +
>  anyOf:
>    - oneOf:
>        - required:
>