linux-kernel - Re: [RFC PATCH 5/6] extcon-gpio: Describe devicetree bindings

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Date:	Thu, 19 Sep 2013 19:35:06 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Mark Rutland <mark.rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [RFC PATCH 5/6] extcon-gpio: Describe devicetree bindings

On Thu, Sep 19, 2013 at 11:28:50AM -0700, Guenter Roeck wrote:
> On Thu, Sep 19, 2013 at 05:42:45PM +0100, Mark Brown wrote:

> > Many of the things described only have passive components attached, or
> > things that otherwise don't need drivers - things like power inputs or
> > headphone connectors, they're mainly providing information to allow
> > userspace to behave differently (eg, display a charging indicator in the
> > UI).  It's not 100% true but by and by large if detection is being done
> > using a GPIO it's probably something like that.

> Correct. However, gpio based 'detect' pins typically need debounce support
> which is not directly available through the gpio userspace API. I tried to add
> that earlier, but was told to use extcon instead as it provides the necessary
> infrastructure. Now it almost looks like I can not use it either because the
> required devicetree bindings may be considered unacceptable.

Yes, I'm trying to explain to Mark why there are drivers just purely for
the connector without any software for the connected device.

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