linux-kernel - Re: [PATCH 04/13] pinctrl: tegra: Only set the gpio range if needed

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Message-ID: <CAAVeFu+L+Qrja4gWEA=FnnbtBFkX43zpmJLJq0PSWLx5m4w6kA@mail.gmail.com>
Date:	Wed, 15 Jul 2015 12:17:14 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Lv Zheng <lv.zheng@...el.com>,
	Alexander Holler <holler@...oftware.de>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Robert Moore <robert.moore@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Len Brown <lenb@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Terje Bergström <tbergstrom@...dia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: Re: [PATCH 04/13] pinctrl: tegra: Only set the gpio range if needed

On Tue, Jul 14, 2015 at 5:34 PM, Tomeu Vizoso
<tomeu.vizoso@...labora.com> wrote:
> On 13 July 2015 at 22:14, Linus Walleij <linus.walleij@...aro.org> wrote:
>> On Wed, Jun 17, 2015 at 3:42 PM, Tomeu Vizoso
>> <tomeu.vizoso@...labora.com> wrote:
>>
>>> If the gpio DT node has the gpio-ranges property, the range will be
>>> added by the gpio core and doesn't need to be added by the pinctrl
>>> driver.
>>>
>>> By having the gpio-ranges property, we have an explicit dependency from
>>> the gpio node to the pinctrl node and we can stop using the deprecated
>>> pinctrl_add_gpio_range() function.
>>>
>>> Note that when the GPIO device gets probed before the associated
>>> princtrl device, the gpio core actually won't register the gpio range.
>>> Thus, this patch is only safe to be merged after we have in place a way
>>> to assure that gpio devices are probed after their associated pinctrl
>>> devices (such as ordered probing).
>>>
>>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
>>
>> This doesn't look like it would hurt, but need Stephen's opinion
>> on it, and I think he's on vacation. Would check with next-in-line
>> Tegra maintainer, Thierry/Alexandre?
>
> Sorry about that, but I have split these changes out into their own
> series after people complained about it.
>
> Have just sent a new version which already has Stephen's ack:
>
> https://lkml.kernel.org/g/1436862596-27730-1-git-send-email-tomeu.vizoso@collabora.com

The change looks ok, but why limit it to Tegra? It seems like it could
apply to any driver that supports gpio-range. Or is it because this
will only work with drivers that use ordered probing?
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