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

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Message-ID: <20090528141743.GA16199@trinity.fluff.org>
Date:	Thu, 28 May 2009 15:17:43 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Jon Smirl <jonsmirl@...il.com>
Cc:	Scott Wood <scottwood@...escale.com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Peter Korsgaard <jacmet@...site.dk>,
	Robert Schwebel <r.schwebel@...gutronix.de>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	Timur Tabi <timur@...escale.com>
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

On Wed, May 27, 2009 at 03:13:55PM -0400, Jon Smirl wrote:
> On Wed, May 27, 2009 at 3:08 PM, Scott Wood <scottwood@...escale.com> wrote:
> > I'm not talking about platform specific code, I'm talking about code to
> > retrieve information about a device from the device tree.  There would not
> > be separate instances of this for "platforms X, Y and Z", just one
> > of_platform binding in each driver.  It's no different than having a
> > platform bus binding, except in the data structures used.
> >
> > But to restate, having external glue to create platform devices from the
> > device tree is fine if that's what you want to do.  We used to do that, but
> > it was a pain compared to keeping everything in one place.  Your experience
> > may differ.
> 
> Could 'struct platform_device' and 'struct of_platform_device" be
> unified into a single structure? It's personal preference whether the
> internal representation of the hardware is done via a device tree or
> snippets of platform code, but do we need to have to different device
> types?

I was wondering what the pros/cons of having a system that takes a
device tree and manufactures platform devices / etc from it? I think
one of the cons is that if you change the platform device data, then
you have not only the board definitions to change, but the of->platform
code to modify as well...

-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.

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