linux-kernel - Re: [PATCH v3 2/2] dt-bindings: iio: adc: add Texas Instruments ADS7924

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Message-Id: <20230115151139.4056356363b5fcff6c42f3ea@hugovil.com>
Date:   Sun, 15 Jan 2023 15:11:39 -0500
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Jonathan Cameron <jic23@...nel.org>, hvilleneuve@...onoff.com,
        lars@...afoo.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] dt-bindings: iio: adc: add Texas Instruments
 ADS7924

On Sun, 15 Jan 2023 20:17:24 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 15/01/2023 17:32, Hugo Villeneuve wrote:
> >>>>> +    required:
> >>>>> +      - reg
> >>>>> +
> >>>>> +    additionalProperties: false  
> >>>>
> >>>> You are not allowing anything else from adc.yaml. Is it on purpose?  
> >>>
> >>> I am really not an expert with this Yaml stuff, and reading the documentation makes me probably more confused than before reading it :)
> >>>
> >>> But one thing that is for sure is that these other properties in adc.yaml are not used in my driver:
> >>>
> >>>   bipolar
> >>>   diff-channels
> >>>   settling-time-us
> >>>   oversampling-ratio
> >>>
> >>> So is it Ok then to use "additionalProperties: false"? I think so, but what is your recommandation?
> >>
> >> Makes sense to me.  Whilst there are lots of things a channel can support, most
> >> of them are hardware related and not universal.
> > 
> > Ok, I think I am finally beginning to see the light here :)
> > 
> > So I will then leave "additionalProperties: false".
> > 
> > I will send a V4 soon with all the latest changes.
> > 
> 
> Just to clarify - we talk about hardware, not your Linux driver. What
> your driver uses or doesn't, should not matter here that much.

Hi,
the following properties are definitely not supported by the hardware:
    bipolar
    diff-channels
    oversampling-ratio

does this means that we should add these lines?
    bipolar: false
    diff-channels: false
    oversampling-ratio: false

as for settling-time-us, I am not sure of its usage and if its related to this hardware.

Hugo.


> Best regards,
> Krzysztof
> 
> 


-- 
Hugo Villeneuve <hugo@...ovil.com>