linux-kernel - Re: Please suggest proper format for DT properties.

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Date:	Tue, 22 Sep 2015 17:17:05 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Constantine Shulyupin <const@...elinux.com>,
	Jean Delvare <jdelvare@...e.com>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: Please suggest proper format for DT properties.

On Tuesday 22 September 2015 08:08:25 Guenter Roeck wrote:
> > I would strongly prefer Option 1 or 2 over option 3.
> > Between 1 and 2, I'd probably go for 1. Another option might
> > be to have a subnode per sensor:
> >
> > nct7802@2a {
> >          compatible = "nuvoton,nct7802";
> >          reg = <0x2a>;
> >       #address-cells=<1>;
> >       #size-cells=<0>;
> >
> >       sensor@1 {
> >               compatible = "nuvoton,nct7802-thermistor";
> >               further-properties;
> >       };
> >       sensor@3 {
> >               compatible = "nuvoton,nct7802-voltage";
> >               for-example-range-mv = <0 5000>;
> >       };
> > };
> >
> I personally would prefer this approach. It would also make it easier to add more
> properties. Wonder what is more appropriate, though - a compatible property or
> something like the following ?
>                 sensor-type = "xxx";
> 
> I don't have a preference, just asking.

I'm not sure here, either way would work, and we are not particularly
consistent in this regard. Maybe someone else has a stronger preference.

> Also, would the index be derived from "@1", or should there be a reg property ?

There needs to be a 'reg' property. Sorry for missing that above.

	Arnd
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