linux-kernel - Re: [PATCH 1/2] extcon: extcon-dra7xx: Add extcon driver for USB ID detection

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Date:	Sat, 24 Aug 2013 22:30:11 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	George Cherian <george.cherian@...com>, balbi@...com,
	myungjoo.ham@...sung.com, cw00.choi@...sung.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, grant.likely@...aro.org,
	rob@...dley.net, ian.campbell@...rix.com, mark.rutland@....com,
	pawel.moll@....co
Subject: Re: [PATCH 1/2] extcon: extcon-dra7xx: Add extcon driver for USB
 ID detection

On 08/20/2013 09:53 AM, Stephen Warren wrote:
> On 08/20/2013 12:55 AM, George Cherian wrote:
>> Hi Stephen,
>>
>> Thanks for your review.
>>
>> On 8/20/2013 1:01 AM, Stephen Warren wrote:
>>
>>> On 08/16/2013 04:13 AM, George Cherian wrote:
>>>> Adding extcon driver for USB ID detection to dynamically
>>>> configure USB Host/Peripheral mode.
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/extcon/extcon-dra7xx.txt
>>>> b/Documentation/devicetree/bindings/extcon/extcon-dra7xx.txt
>>>> +EXTCON FOR DRA7xx
>>>> +
>>>> +Required Properties:
>>> Please at lest explain what a DRA7xxx is, and the purpose of the HW
>>> module this binding describes.
>>
>> DRA7xx is the SoC name and the USB VID  detection is implemented via gpio's
>> Basically it does only ID detection via GPIO and there is no VBUS
>> detection in h/w.
>
> If there's no SoC-specific HW, then the binding has nothing to do with
> the SoC; it's entirely generic.
>
I am currently working on adding device tree support to the extcon-gpio driver.

Wonder if it would make sense to just use that driver. As far as I can see
the only missing part is support for multiple cables and cable naming through
device tree properties.

Any thoughts ? The patches are not yet clean enough to submit upstream,
but I could send them as RFC if there is interest.

Guenter

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