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

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Message-Id: <1243497521.3171.161.camel@pasglop>
Date:	Thu, 28 May 2009 17:58:41 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	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 Wed, 2009-05-27 at 14:54 -0600, Grant Likely wrote:
> > Have to duplicated ressource handling via ifdef in every drivers is
> also an
> > overhead which need to be avoided
> 
> agreed.  I don't have a best of both worlds answer here.

Right and I don't advocate changing existing perfectly working platform
drivers, I think having wrappers to create them is fine.

In fact, I've been thinking for a long time about doing something like
that: Have those wrappers be registered via a standard OF set of match
strings for bus types and device types.

Then we can have a single loop that walks the tree, invoke those
"constructors" that return a struct device * (whatever the device
type that was actually created, could have been platform_device,
pci_dev, amba_device, etc...). It also passes them the parent device *

That way, all devices are instanciated from the DT -and- the topology
in sysfs preserves the topology in the device-tree (ie, parent/child
relationships are preserved).

Cheers,
Ben.

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