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

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Date: Fri, 2 Feb 2024 16:13:02 +0530
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Conor Dooley <conor@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Peter Rosin <peda@...ntia.se>, 
	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,


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:
> > > > voltage-divider is always an iio consumer at the same time it is
> > > > optionally an iio provider.
> > > > Hence add #io-channel-cells
> > > > Also update example.
> > > >
> > >
> > > Fix
> > > wrapping
> > > and
> > > proper
> > > sentences. Each sentence finishes with full stop.
Sure
> > >
> > > ...
> > > >    output-ohms:
> > > >      description:
> > > >        Resistance Rout over which the output voltage is measured. See full-ohms.
> > > > @@ -75,12 +82,17 @@ examples:
> > > >              spi-max-frequency = <1000000>;
> > > >          };
> > > >      };
> > > > -    sysv {
> > > > +    p12v_vd: sysv {
> > >
> > > No, drop label.
Sure
> > >
> > > >          compatible = "voltage-divider";
> > > >          io-channels = <&maxadc 1>;
> > > > +        #io-channel-cells = <1>;
> > > >
> > > >          /* Scale the system voltage by 22/222 to fit the ADC range. */
> > > >          output-ohms = <22>;
> > > >          full-ohms = <222>; /* 200 + 22 */
> > > >      };
> > > > +    iio-hwmon {
> > > > +        compatible = "iio-hwmon";
> > > > +        io-channels = <&p12v_vd 0>;
> > >
> > > The same question as for v2. Drop unrelated example.
Sure
> >
> > 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 ?

Regards,
Naresh
>
> Thanks,
> Conor.

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