linux-kernel - Re: [RFC PATCH v2 00/13] arm/tegra: Initialize GPIO & pinmux from DT

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Message-Id: <201108181115.53101.arnd@arndb.de>
Date:	Thu, 18 Aug 2011 11:15:52 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Colin Cross <ccross@...roid.com>,
	Erik Gilling <konkers@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Belisko Marek <marek.belisko@...il.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Sergei Shtylyov <sshtylyov@...sta.com>
Subject: Re: [RFC PATCH v2 00/13] arm/tegra: Initialize GPIO & pinmux from DT

On Thursday 18 August 2011, Stephen Warren wrote:
> It looks like DT already supports the generic case for GPIO; each GPIO
> reference is of the form:
> 
> <&gpio 69 0>
> 
> and so each GPIO has a "parent" specified, and hence can come from a
> different controller.
> 
> For drivers, this is all completely hidden by of_get_gpio().
> 
> I imagine we'd just use the same pattern for pinmux. This would both
> support the general case, and end up being consistent with how GPIOs
> already work, so this seems like a win both ways.
> 

Ah right. I had not seen the gpio binding yet, so that definitely works.

	Arnd
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