linux-kernel - Re: [PATCH 2/2] drivers/amba: probe via device tree

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Date:	Wed, 25 May 2011 11:07:18 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Kevin Hilman <khilman@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] drivers/amba: probe via device tree

2011/5/24 Rob Herring <robherring2@...il.com>:

> I think having "arm,amba-deviceid" is not needed. The current code does
> nothing but warn if it doesn't match the h/w value. The drivers already have
> a list of id's that they support and the amba bus only matches against the
> h/w id value. The only use I can see is overriding a broken h/w value.

We have this usecase in the Ux500. See these patches:
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6829/1
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6830/1

Alas, it's not yet merged for the old boardfile world usecase, and
causing us problems to drive our hardware already.

Yours,
Linus Walleij
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