linux-kernel - Re: [PATCH 1/3] dt-bindings: iio: adc: stm32: add support for diff channels

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Date:   Tue, 24 Oct 2017 19:42:52 +0100
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     Rob Herring <robh@...nel.org>,
        Fabrice Gasnier <fabrice.gasnier@...com>
CC:     jic23@...nel.org, linux@...linux.org.uk, mark.rutland@....com,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        lars@...afoo.de, knaack.h@....de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        benjamin.gaignard@...aro.org, benjamin.gaignard@...com
Subject: Re: [PATCH 1/3] dt-bindings: iio: adc: stm32: add support for diff channels



On 24 October 2017 17:41:38 BST, Rob Herring <robh@...nel.org> wrote:
>On Tue, Oct 17, 2017 at 03:15:43PM +0200, Fabrice Gasnier wrote:
>> STM32H7 ADC channels may be configured either as single-ended or
>> differential.
>> Add 'st,adc-diff-channels' property to support differential channels.
>> Differential channels are defined as a pair of positive and negative
>> inputs: vinp & vinn.
>> 
>> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
>> ---
>>  Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 6
>++++++
>>  1 file changed, 6 insertions(+)
>> 
>> diff --git
>a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
>b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
>> index 48bfcaa3..c3c8de1 100644
>> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
>> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
>> @@ -62,6 +62,12 @@ Required properties:
>>  - st,adc-channels: List of single-ended channels muxed for this ADC.
>>    It can have up to 16 channels on stm32f4 or 20 channels on
>stm32h7, numbered
>>    from 0 to 15 or 19 (resp. for in0..in15 or in0..in19).
>> +- st,adc-diff-channels: List of differential channels muxed for this
>ADC.
>> +  Depending on part used, some channels can be configured as
>differential
>> +  instead of single-ended (e.g. stm32h7). List here positive and
>negative
>> +  inputs pairs as <vinp vinn>, <vinp vinn>,... vinp and vinn are
>numbered
>> +  from 0 to 19 on stm32h7)
>> +  Note: At least one of "st,adc-channels" or "st,adc-diff-channels"
>is required.
>
>Wouldn't both present be invalid?
>

Probably invalid to have a number in both but some channels in each would be fine.

>>  - #io-channel-cells = <1>: See the IIO bindings section "IIO
>consumers" in
>>    Documentation/devicetree/bindings/iio/iio-bindings.txt
>>  
>> -- 
>> 1.9.1
>> 

-- 
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