linux-kernel - Re: [PATCH 1/4] dt-bindings: iio: adc: sd modulator: add vref support

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Date:   Tue, 11 Feb 2020 15:24:19 +0000
From:   Olivier MOYSAN <olivier.moysan@...com>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "knaack.h@....de" <knaack.h@....de>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/4] dt-bindings: iio: adc: sd modulator: add vref support

On 2/8/20 5:04 PM, Jonathan Cameron wrote:
> On Tue, 4 Feb 2020 11:10:05 +0100
> Olivier Moysan <olivier.moysan@...com> wrote:
>
>> Add vref supply support to sigma delta modulator.
>>
>> Signed-off-by: Olivier Moysan <olivier.moysan@...com>
>> ---
>>   .../devicetree/bindings/iio/adc/sigma-delta-modulator.yaml    | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
>> index a390343d0c2a..2afe0765e971 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
>> +++ b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
>> @@ -8,6 +8,7 @@ title: Device-Tree bindings for sigma delta modulator
>>   
>>   maintainers:
>>     - Arnaud Pouliquen <arnaud.pouliquen@...com>
>> +  - Olivier Moysan <olivier.moysan@...com>
>>   
>>   properties:
>>     compatible:
>> @@ -21,6 +22,9 @@ properties:
>>     '#io-channel-cells':
>>       const: 0
>>   
>> +  vref-supply:
>> +    description: Phandle to the vref input analog reference voltage.
> I note this in review of patch 2 but in general I'm not sure we should
> be introducing this for generic devices.   It's fine if we have an
> explicit compatible but there is no reason to assume a generic sd-modulator
> uses an external reference.
>
> Jonathan
Ok, I will remove reference to external voltage for generic 
sd-modulator, in v2.
I will add it for ads1201 compatible, instead.

Thanks for your review
Olivier
>> +
>>   required:
>>     - compatible
>>     - '#io-channel-cells'