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

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Date:	Thu, 28 May 2009 07:34:02 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	Robert Schwebel <r.schwebel@...gutronix.de>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Jon Smirl <jonsmirl@...il.com>,
	Scott Wood <scottwood@...escale.com>,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	Timur Tabi <timur@...escale.com>
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

On Thu, May 28, 2009 at 12:34 AM, Wolfram Sang <w.sang@...gutronix.de> wrote:
>
>> It is inherent in the value "atmel,24c08".  Because the exact device
>> model is specified, the kernel can know what the page size and flags
>> are for that device.
>
> I am afraid this is not the case. I remember that we once had two revisions of
> the same eeprom, and the vendor decided to increase the page size without
> changing the naming of the eeprom. (Can't point to any documentation yet, would
> have to dig this up.) Those eeproms can be really weird.
>
> Also, there are _a lot_ of eeprom manufacturers out there, so the match table
> will be enormous....

... which is the whole point of "compatible".  Every possible variant
doesn't get listed in the device driver; device nodes in the tree
claim compatibility with older, already known parts.

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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