linux-kernel - Re: [PATCH v2 1/2] i2c-core: dt: Pick i2c bus number from i2c alias if present

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Date:	Mon, 14 Jan 2013 22:34:25 -0800
From:	Olof Johansson <olof@...om.net>
To:	Doug Anderson <dianders@...omium.org>
Cc:	linux-i2c@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Padmavathi Venna <padma.v@...sung.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Wolfram Sang <w.sang@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] i2c-core: dt: Pick i2c bus number from i2c alias
 if present

On Mon, Jan 14, 2013 at 10:53:21AM -0800, Doug Anderson wrote:
> This allows you to get the equivalent functionality of
> i2c_add_numbered_adapter() with all data in the device tree and no
> special case code in your driver.  This is a common device tree
> technique.
> 
> For quick reference, the FDT syntax for using an alias to provide an
> ID looks like:
>   aliases {
>     i2c0 = &i2c_0;
>     i2c1 = &i2c_1;
>   };
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Acked-by: Haojian Zhuang <haojian.zhuang@...il.com>

The call path for i2c_add_numbered_adapter() with nr == -1 is a little
awkward now, but I don't see much how it can be improved much.

Acked-by: Olof Johansson <olof@...om.net>


-Olof
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