linux-kernel - Re: [PATCH v2 4/5] mfd: arizona: Update DT binding documentation for mic detection

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Date:	Tue, 13 Oct 2015 16:23:31 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Chanwoo Choi <cw00.choi@...sung.com>,
	Mark Brown <broonie@...nel.org>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<myungjoo.ham@...sung.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<patches@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH v2 4/5] mfd: arizona: Update DT binding documentation
 for mic detection

On Tue, Oct 13, 2015 at 03:18:22PM +0100, Lee Jones wrote:
> On Tue, 13 Oct 2015, Chanwoo Choi wrote:
> > On 2015년 10월 13일 22:59, Chanwoo Choi wrote:
> > > On 2015년 10월 13일 22:50, Lee Jones wrote:
> > >> On Tue, 13 Oct 2015, Charles Keepax wrote:
> > >>
> > >>> On Tue, Oct 13, 2015 at 09:02:18AM +0100, Lee Jones wrote:
> > >>>> On Mon, 12 Oct 2015, Mark Brown wrote:
> > >>>>
> > >>>>> On Mon, Oct 12, 2015 at 09:45:54AM +0100, Charles Keepax wrote:
> > >>>>>> On Wed, Oct 07, 2015 at 01:26:42PM +0100, Lee Jones wrote:
> > >>>>>>> On Wed, 07 Oct 2015, Mark Brown wrote:
> > >> Now I know that jack detection is an Extcon thing and Extcon Ack will
> > >> do just nicely.  However, that begs the question; if they are an
> > >> Extcon thing, why aren't they in the Extcon binding document?
> > > 
> > > As I knew, the arizona-extcon is one device of the MFD devices 
> > > for WMxxxx series in the driver/mfd/arizona-core.c. So, If arizona-extcon
> > > driver needs the some property for dt support, some property should be
> > > included in MFD device tree node. There is no separate device tree node for
> > > arizona-extcon driver.
> > 
> > If creating the separate extcon doc for extcon-arizona.c driver, it is possible
> > to make the child device tree node which is located at the below of arizona MFD
> > device tree node.
> > 
> > I agree about Lee's opinion to make the separate the Extcon doc for extcon-arizona.c.
> 
> This is how we normally document MFDs.  Extcon doesn't even need to
> have it's own child-node (it can if you want though -- it's however
> you want to represent it), you can just put something like this in the
> MFD binding doc:
> 
> Optional properties
> this		: Does this
> that		: Does that
> 
> Also any child device specific property:
> 	GPIO    See: ../extcon/arizona.txt
> 	Extcon  See: ../gpio/arizona.txt
> 
> Etc.  Or words to that effect.  See some other MFDs for examples.

More accident of history than anything else I will send a patch
to split the binding up into the seperate subsystems shortly.

Thanks,
Charles
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