linux-kernel - Re: [PATCH v2] gpio: davinci: fix gpio selection for OF

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Date:	Mon, 17 Mar 2014 18:59:41 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Alexander Holler <holler@...oftware.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Prabhakar Lad <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v2] gpio: davinci: fix gpio selection for OF

On Friday 14 March 2014 04:32 PM, Linus Walleij wrote:
> On Fri, Mar 14, 2014 at 11:08 AM, Alexander Holler <holler@...oftware.de> wrote:
>> Am 11.03.2014 11:15, schrieb Linus Walleij:
>>> On Wed, Mar 5, 2014 at 12:21 PM, Alexander Holler <holler@...oftware.de> wrote:
>>>
>>>> The driver missed an of_xlate function to translate gpio numbers
>>>> as found in the DT to the correct chip and number.
>>>>
>>>> While there I've set #gpio_cells to a fixed value of 2.
>>>>
>>>> I've used gpio-pxa.c as template for those changes and tested my changes
>>>> successfully on a da850 board using entries for gpio-leds in a DT. So I didn't
>>>> reinvent the wheel but just copied and tested stuff.
>>>>
>>>> Thanks to Grygorii Strashko for the hint to the existing code in gpio-pxa.
>>>>
>>>> Signed-off-by: Alexander Holler <holler@...oftware.de>
>>>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>>>
>>> This v2 version applied, thanks!
>>
>> Thanks, but actually that should have been a fix for 3.14 with which the
>> OF functionality for davinci gpio gets introduced. I assum with the
>> patch in for-next, 3.14 will appear with that functionality broken and
>> it will become a candidate for -stable.
> 
> I just get the impression that DT support for DaVinci in v3.14 is so risky
> and unstable that noone except those implementing it (i.e. you) is really
> using it, is that correct?
> 
> In that case it is hardly a fix that we need to rush out to the entire world.

One thing to note is that this driver is used by keystone too and all
its users are DT-only. Although I do not see any in-kernel DT GPIO users
even there.

I can confirm the patch does not break my gpiolib based test module
(test with and without DT), but then it did not have an issue even before.

Thanks,
Sekhar

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