In response to new device tree code in the kernel, OLPC will start using

In response to new device tree code in the kernel, OLPC will start using
it for probing of certain devices.  However, some firmware fixes are
needed to put the devicetree into a usable state.

Retain compatibility with old firmware by fixing up the device tree at
boot-time if it does not contain the new nodes/properties that we need for
probing.  This is the same approach taken on PPC platforms.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Andres Salomon <dilinger@queued.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>