Date:	Tue, 13 Oct 2015 22:59:40 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Lee Jones <lee.jones@...aro.org>,
	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	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

Hi Lee,

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:
>>>>
>>>>>>> This all seems pretty much fine to me - the things it is controlling are
>>>>>>> fairly specific to the way the former Wolfson devices do, they only
>>>>>>> really make sense with a fairly particular algorithm which isn't widely
>>>>>>> implemented.
>>>>
>>>>>> Is that an Ack?
>>>>
>>>>> I am guessing Mark is slightly hesitant to ack as he probably
>>>>> doesn't want to add reviewing all our jack detection bindings to
>>>>> his already fairly sizable work load and doing so here likely
>>>>> means it will be expected in the future. From talking to people at
>>>
>>> Providing Acks should not (and has not to my knowledge) be a binding
>>> contract to continue providing Acks.  However, should more bindings be
>>> submitted which appear as though they are related to a particular
>>> maintainer, then sure, you'll be asked for your expert eye again.
>>
>> Its not a binding contract to continue providing them but we are
>> making that a condition of merging any patches, which means I
>> will need to chase Mark for Acks, as it seems the DT maintainers
>> won't have any interest in reviewing/acking these.
> 
> I've already made it a condition, as I refuse to blindly accept
> unknown bindings.  Taking a sea of bindings I have no knowledge of
> would be a bad-thing(tm).  If these were GPIO bindings, I'd be asking
> Linus for help, likewise if they were I2C, I'd be asking Wolfram.
> 
>>>> Pretty much (plus generally being busy at ELC-E last week) - if there's
>>>> specific questions that's one thing but if it's just general requests to
>>>> look at bindings then it seems like the relevant subsystem maintainers
>>>
>>> This is exactly my point.  I am not the 'relevant subsystem
>>> maintainer' for these properties and subsequently know nothing of
>>> microphone detection, headsets, bias', etc.  These look like Audio
>>> related properties to me (the uninitiated), which is why you were
>>> asked.
>>
>> It would be sensible I guess to define whether I should be
>> including audio people on jack detection patches even if they
>> don't touch audio subsystems. I was treating jack detection
>> as an extcon thing and thus assuming that the extcon maintainer
>> would be sufficient, but perhaps that is an incorrect assumption.
> 
> 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.

Thanks,
Chanwoo Choi

> 
>>>> should have the confidence to review straightfoward device properties
>>>> like this.
>>>
>>> I don't think these bindings are particularly straightforward.  The
>>> contain many terms which I'm unfamiliar with, and again, to me (the
>>> uninitiated) this looks like way too many bindings just to see if an
>>> audio jack is plugged in or not.
>>
>> I also wish our designers would make less complex hardware sigh.
>>
>> Apologies I didn't mean to cause any offense here, I am just
>> getting a bit concerned about how I can get any DT support for
>> jack detection upstreamed. I am more than happy to fix up any
>> comments anyone has or answer any questions about what things
>> are or why they are required.
> 
> Hopefully there won't be too many more bindings to come?
> 
> My issue is that as they are not MFD related, I need some advice from
> my colleagues to whom they are related to.
> 
>> The jack detection on these chips is fairly complex and there are
>> going to be plenty more patches before we have full support for
>> it in DT. So I think it would be good for everyone if we can
>> agree some process for how to handle this type of patch.
> 
> Put them in the subsystem where they pertain to -- job done.
> 

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