Re: [PATCH RFC 0/3] dt-bindings: iio: adc: Add reference, excitation and burn-out properties

[David Lechner]

On 6/18/26 7:33 PM, Kurt Borja wrote:
> Hi all,
> 
> After submitting a patch series adding support for TI ADS126X ADCs [1],
> I was made aware by David [2] that at least two more chip families,
> ads1220 [3] and ads1x2c14, share very similar features (though these
> chips are not really compatible between them). After that, I found one
> more chip with the same features which is already upstream, the
> AD4170-4.
> 
> As David explained in [2], these chips are intended to be used with
> RTDs, thermocouples or other resistive sensors so they share the
> following per-channel features:
> 
>   - Configurable reference selection
>   - Burn-out Current Sources (BOCS) for diagnostic purpuses
>   - Excitation current sources (usually called IDACs TI) for sensor
>     current biasing
> 
> Given that these three features are present in all four devices and
> three of these drivers are still under review, my proposal is to have
> these features be described in adc.yaml and have this series merged
> before the three others [1] [2] [3].
> 
> This series is sent as RFC because I still don't have much experience
> with dt-bindings and I don't know if this approach or the properties are
> general enough to be described like this.

Generally, we don't propose bindings without users in the same series.
I was going to wait to see what feedback Jonathan gave on my series
before proposing this.

> 
> No dependencies between properties were provided because not all devices
> may be able to configure each one of them.
> 
> [1] https://lore.kernel.org/linux-iio/20260612-ads126x-v1-0-894c788d03ed@xxxxxxxxx/
> [2] https://lore.kernel.org/linux-iio/20260615-iio-adc-ti-ads122c14-v1-0-e6bdadf7cb2b@xxxxxxxxxxxx/
> [3] https://lore.kernel.org/linux-iio/20260610151342.44274-1-zizuzacker@xxxxxxxxx/
> 
> Signed-off-by: Kurt Borja <kuurtb@xxxxxxxxx>
> ---
> Kurt Borja (3):
>       dt-bindings: iio: adc: Add reference-source property
>       dt-bindings: iio: adc: Add excitation current sources properties
>       dt-bindings: iio: adc: Add burn-out current properties
> 
>  Documentation/devicetree/bindings/iio/adc/adc.yaml | 47 ++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> ---
> base-commit: a50909aa46dec46de3c73235fc15a7d6f763d996
> change-id: 20260618-new-channel-props-4fbd52020da2
>