linux-kernel - Re: [RFC] [PATCH] Device Tree on ARM platform

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Message-Id: <20090527.170023.245980842.davem@davemloft.net>
Date:	Wed, 27 May 2009 17:00:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	r.schwebel@...gutronix.de
Cc:	grant.likely@...retlab.ca, plagnioj@...osoft.com,
	devicetree-discuss@...abs.org, linux@....linux.org.uk,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk, jonsmirl@...il.com,
	scottwood@...escale.com, yuan-bo.ye@...orola.com,
	timur@...escale.com
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

From: Robert Schwebel <r.schwebel@...gutronix.de>
Date: Thu, 28 May 2009 01:57:05 +0200

> On Wed, May 27, 2009 at 02:22:50PM -0600, Grant Likely wrote:
>> 2) Driver binding mechanism:  device tree nodes usually have a
>> "compatible" property which is a list of strings. The first string
>> describes exactly what the device is (ie. "atmel,24c08") and an
>> optional list of other devices which it is register interface
>> backwards compatible with.
> 
> This is a good example. The "exact" description above doesn't say
> anything about some of the details the driver needs to know. Here is the
> at24 driver:
> 
> http://lxr.linux.no/linux+v2.6.29/include/linux/i2c/at24.h#L18
> 
> Where do we get the page size & flags from?

You can use device node properties.

Every device node has mode than just a "name" and "compatible"
property.  You can add arbitrary properties, which are simply name -->
value pairs.  The type of the value is opaque, it can be any arbitrary
binary data, a string, a 32-bit integer, a MAC address, etc.
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