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

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Message-ID: <CACRpkdY1PPTvuF1ntiybGYoN8nHD7dojtuuJkKpUPXNjBpK1nw@mail.gmail.com>
Date:	Mon, 13 Jul 2015 22:14:03 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Alexander Holler <holler@...oftware.de>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kumar Gala <galak@...eaurora.org>, Len Brown <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lv Zheng <lv.zheng@...el.com>, Mark Brown <broonie@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Robert Moore <robert.moore@...el.com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Terje Bergström <tbergstrom@...dia.com>
Subject: Re: [PATCH 04/13] pinctrl: tegra: Only set the gpio range if needed

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?

Yours,
Linus Walleij
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