linux-kernel - Re: [PATCH v5 1/4] hwmon: ltc2978: device tree bindings documentation

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Message-ID: <542F2FE3.60507@roeck-us.net>
Date:	Fri, 03 Oct 2014 16:23:15 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Mark Brown <broonie@...nel.org>
CC:	Mark Rutland <mark.rutland@....com>,
	"atull@...nsource.altera.com" <atull@...nsource.altera.com>,
	"jdelvare@...e.de" <jdelvare@...e.de>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"delicious.quinoa@...il.com" <delicious.quinoa@...il.com>,
	"dinguyen@...nsource.altera.com" <dinguyen@...nsource.altera.com>,
	"yvanderv@...nsource.altera.com" <yvanderv@...nsource.altera.com>
Subject: Re: [PATCH v5 1/4] hwmon: ltc2978: device tree bindings documentation

On 10/03/2014 04:13 PM, Mark Brown wrote:
> On Fri, Oct 03, 2014 at 10:28:59AM -0700, Guenter Roeck wrote:
>> On 10/03/2014 05:27 AM, Mark Rutland wrote:
>
>>>> +Optional properties:
>>>> + Name of the optional regulator subnode must be "regulators".
>>>> +  - #address-cells must be 1.
>
>>> What's the single address cell used for?
>
>> I think this is required by the regulator bindings.
>> Other regulators use the same, though they don't typically
>> mention it in the properties list but only in the examples.
>
> Nope, nothing to do with regulator that I'm aware of and I've not seen
> any examples (but I don't tend to review users too often).
>

Many examples, really. Just picking one.

Documentation/devicetree/bindings/mfd/tps6507x.txt

	regulators {
                 #address-cells = <1>;
                 #size-cells = <0>;
		...

This also uses the reg property for the regulator index
(without explaining it further). Seems to be pretty common.

Guenter

>>> Mark, what's the preferred scheme for identifying regulators in a
>>> container node?
>
>>>> +  - regulator-name: arbitrary name for regulator
>
>>> Drop the 'aribtarary'. Either this should be the name of the regulator
>>> on the board, or it shouldn't be necessary.
>
>> Not sure if it even needs to be documented here. It is already documented
>> in Documentation/devicetree/bindings/regulator/regulator.txt.
>
> Document by reference then?  It really should be the name of the supply
> provided by the regulator, that wording is probably good.  Given that
> it's a standard regulator property I'd not document it here at all, just
> refer to the generic bindings and say any suitable properties there can
> be used.
>

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