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

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Message-ID: <20090527163223.GE1970@sirena.org.uk>
Date:	Wed, 27 May 2009 17:32:24 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Robert Schwebel <r.schwebel@...gutronix.de>
Cc:	Timur Tabi <timur@...escale.com>,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk, rmk@....linux.org.uk
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

On Wed, May 27, 2009 at 05:05:27PM +0200, Robert Schwebel wrote:

> I'm highly convinced that the existence of oftree-hell in ARM-land would
> have been *the* key motivation for FSL to have worked on mainline
> instead of inhouse-BSPs back in 2004 when we mainlined i.MX1 and in 2007
> when we started the mainline work on MX27 and MX31.

I remain to be convinced about that but anyway..

> Seriously: oftree in general is a good idea. Just that it doesn't work
> in practise. The concept has some serious flaws:

> - Platform data makes it possible to store function pointers. There
>   is no equivalent to this concept in oftree-land.

The handling of platform data is my main concern as someone working
primarily on platform independant drivers - function pointers are a
particular problem but the possibility of having to write code to
handle both OF and non-OF systems to cater for systems using both
approaches is also a concern for me.

> oftree could be a great tool if these things would be resolved.
> Currently they are not, and in result, ARM just works and is easy,
> whereas on PowerPC systems people often spend more time working on
> binding stuff than on the actual functionality.

This worries me too, my experiences with OF device tree handling for
ASoC have been pretty negative - but then audio is one of the worst
cases for handling within the device tree.
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