Re: [PATCH RFC 1/3] dt-bindings: iio: adc: Add reference-source property

[Kurt Borja]

Hi Conor,

On Fri Jun 19, 2026 at 9:14 AM -05, Conor Dooley wrote:
> On Thu, Jun 18, 2026 at 07:33:01PM -0500, Kurt Borja wrote:
>> Some ADCs have configurable voltage reference sources for each channel.
>> 
>> Signed-off-by: Kurt Borja <kuurtb@xxxxxxxxx>
>> ---
>>  Documentation/devicetree/bindings/iio/adc/adc.yaml | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml
>> index b9bc02b5b07a4c..c74c2084fdb68c 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/adc.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml
>> @@ -73,6 +73,16 @@ properties:
>>        device design and can interact with other characteristics such as
>>        settling time.
>>  
>> +  reference-source:
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>> +    maxItems: 2
>> +    minItems: 1
>> +    description:
>> +      Indicates the voltage reference source or sources for this channel.
>> +
>> +      This array describes either a single reference source or a positive and
>> +      negative reference sources.
>
> I have no idea from this description what this actually refers to. Is it
> a pin? A supply? A channel?

It can be pins but also can be internal vref sources. Not always a
supply though, in some applications a resistor is connected to the
reference source pins.

If there is a next version I'll clarify it.

>
>> +
>>  anyOf:
>>    - oneOf:
>>        - required:
>> 
>> -- 
>> 2.54.0
>> 

-- 
Thanks,
 ~ Kurt