linux-kernel - Re: [PATCH v3] dt-bindings: iio: afe: voltage-divider: Add io-channel-cells

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Date: Mon, 5 Feb 2024 19:24:07 +0530
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Conor Dooley <conor.dooley@...rochip.com>
Cc: Peter Rosin <peda@...ntia.se>, Conor Dooley <conor@...nel.org>, 
	Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Jonathan Cameron <jic23@...nel.org>, 
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	mazziesaccount@...il.com, linux-iio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] dt-bindings: iio: afe: voltage-divider: Add io-channel-cells

Hi Conor, Peter,

On Fri, 2 Feb 2024 at 18:39, Conor Dooley <conor.dooley@...rochip.com> wrote:
>
> On Fri, Feb 02, 2024 at 12:49:26PM +0100, Peter Rosin wrote:
> > 2024-02-02 at 11:43, Naresh Solanki wrote:
> > > On Wed, 31 Jan 2024 at 22:24, Conor Dooley <conor@...nel.org> wrote:
> > >> On Wed, Jan 31, 2024 at 04:35:16PM +0000, Jonathan Cameron wrote:
> > >>> On Wed, 31 Jan 2024 09:29:59 +0100
> > >>> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> > >>>> On 30/01/2024 12:56, Naresh Solanki wrote:
> > >>> Conor requested an example of the device acting as a consumer and a provider.
> > >>> Might have meant in the patch description?
> > >>>
> > >>> Conor?
> > >>
> > >> I wanted it in the property description to help with understanding when
> > >> to use it. I don't think the extra example nodes actually help you
> > >> understand what it is doing, only how to write one yourself once you
> > >> know you need it.
> > >
> > > I'm not sure if I get it right but what I understood is that a
> > > voltage-divider can
> > > also be a provider to other devices & hence the property.
> > > Also do you want me to put a complete example of it in description ?
> >
> > My understanding is the requested example in the description should not
> > be exactly /how/ to hook up the voltage-divider as a provider, but
> > instead have some words about why it is interesting to do so at all. And
> > those words would also make it clear that is even possible. The latter
> > is something which, to be honest, is perhaps not all that obvious. It
> > has always been totally obvious to me of course, sorry for not being
> > clearer when I wrote the binding...
>
> Yeah, you're right about what I was looking for Peter.
>
> In my original request, which I think I already linked to in this
> thread, I said that I would like an example like the one that Peter had
> used to explain to me the scenario in which someone would want to use
> this feature:
> https://lore.kernel.org/all/536971eb-51f0-40e5-d025-7c4c1d683d49@axentia.se/
ok. Based on my understanding, I'll update the property description
with an example.

description:
In addition to consuming the measurement services of a voltage output
channel the voltage divider can act as a provider of measurement
services to other devices. This is particularly useful in scenarios wherein,
ADC has analog frontend such as voltage divider then consuming its raw
value isn't interesting. It is desired to get real voltage before
voltage divider.

Regards,
Naresh

>
> Cheers,
> Conor.