linux-kernel - Re: [PATCH v5 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

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Date: Sun, 14 Apr 2024 23:31:33 +0300
From: Alisa-Dariana Roman <alisadariana@...il.com>
To: David Lechner <dlechner@...libre.com>
Cc: michael.hennerich@...log.com, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 alexandru.tachici@...log.com, lars@...afoo.de, jic23@...nel.org,
 robh@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 lgirdwood@...il.com, broonie@...nel.org, andy@...nel.org,
 nuno.sa@...log.com, marcelo.schmitt@...log.com, bigunclemax@...il.com,
 okan.sahin@...log.com, fr0st61te@...il.com, alisa.roman@...log.com,
 marcus.folkesson@...il.com, schnelle@...ux.ibm.com, liambeguin@...il.com
Subject: Re: [PATCH v5 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

On 13.04.2024 22:29, David Lechner wrote:
> On Sat, Apr 13, 2024 at 10:13 AM Alisa-Dariana Roman
> <alisadariana@...il.com> wrote:
>>
>> Unlike the other AD719Xs, AD7194 has configurable differential
>> channels. The user can dynamically configure them in the devicetree.
>>
>> Also add an example for AD7194 devicetree.
>>
>> Signed-off-by: Alisa-Dariana Roman <alisa.roman@...log.com>
>> ---
>>   .../bindings/iio/adc/adi,ad7192.yaml          | 74 +++++++++++++++++++
>>   1 file changed, 74 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
>> index ba506af3b73e..855f0a2d7d75 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
>> @@ -21,8 +21,15 @@ properties:
>>         - adi,ad7190
>>         - adi,ad7192
>>         - adi,ad7193
>> +      - adi,ad7194
>>         - adi,ad7195
>>
>> +  "#address-cells":
>> +    const: 1
>> +
>> +  "#size-cells":
>> +    const: 0
>> +
>>     reg:
>>       maxItems: 1
>>
>> @@ -104,8 +111,43 @@ required:
>>     - spi-cpol
>>     - spi-cpha
>>
>> +patternProperties:
>> +  "^channel@[0-9]+$":
>> +    type: object
>> +    $ref: adc.yaml
>> +    unevaluatedProperties: false
>> +
>> +    properties:
>> +      reg:
>> +        description: The channel index.
>> +        minimum: 1
>> +        maximum: 256
>> +
>> +      diff-channels:
>> +        description: |
>> +          Both inputs can be connected to pins AIN1 to AIN16 by choosing the
>> +          appropriate value from 1 to 16.
>> +        items:
>> +          minimum: 1
>> +          maximum: 16
> 
> Don't we also need to allow 0 for AINCOM here? Or is this property
> only for fully differential pairs and not pseudo-differential pairs?

I thought it would be a good idea to have the pseudo-differential pairs 
set in the driver (all from AIN1 to AIN16 referenced to AINCOM). Only 
differential ones are fully configurable in the devicetree.

Kind regards,
Alisa-Dariana Roman