Re: [PATCH v2 1/7] dt-bindings: iio: adc: Add TI ADS126x ADC family

[Kurt Borja]

On Mon Jun 29, 2026 at 9:21 AM -05, David Lechner wrote:
> On 6/28/26 2:12 PM, Kurt Borja wrote:
>> On Sun Jun 28, 2026 at 10:45 AM -05, David Lechner wrote:
>>> On 6/28/26 12:36 AM, Kurt Borja wrote:
>>>> The ADS1262 and ADS1263 are 32-bit, 38.4-kSPS delta-sigma ADCs with an
>>>> integrated PGA, internal reference, excitation and burn-out current
>>>> sources for sensor biasing and diagnostics. The ADS1263 adds a second,
>>>> 24-bit delta-sigma ADC (ADC2) for background measurements.
>>>>
>
> ...
>
>>>> +
>>>> +patternProperties:
>>>> +  "^channel@[0-9]+$":
>>>> +    $ref: /schemas/iio/adc/adc.yaml#
>>>> +    unevaluatedProperties: false
>>>> +
>>>> +    properties:
>>>> +      reg:
>>>> +        maxItems: 1
>>>> +
>>>
>>> If we want to allow single-ended/pseudo-differential inputs, then we should
>>> also allow single-channel (positive pin) and common-mode-channel (negative
>>> pin) properties.
>>>
>>> This will also require additional common-mode-<N>-supply properties to allow
>>> for the negative pin connected to something other than GND.
>> 
>> Ah interesting. Why the N though? wouldn't a single supply connected to
>> AINCOM be enough here?
>
> In theory, any AINx could be a common mode input by connecting it to
> a constant voltage supply.

Technically yes, but there is a pin named AINCOM intended for this
purpose. Can we do a simplification here? I propose having

  common-mode-channel:
    /* AINCOM pin */
    const: 10

That way we would only need one common-mode-supply. Would that be okay?

-- 
Thanks,
 ~ Kurt