[PATCH] add new OF device tree API (2.6.0-test3)

[Nathan Lynch]

Hi-

This is an adaptation of the new Open Firmware device tree traversal API
from ppc32, originally written by Benjamin Herrenschmidt.  This patch is
against 2.6.0-test3, but should apply ok to the latest 2.5 ameslab tree.

These functions are meant to be SMP-safe alternatives to the current set
of query/traversal routines (find_devices, find_type_devices, et al).

Some things which I plan to add within the next few days:
- "porting" arch/ppc64 to the new API
- implementation of reference counting
- support for addition and removal of device nodes
- a /proc-based mechanism for initiating node addition and removal from
userspace

Comments?  I'm especially interested in feedback on whether a rwlock
approach would be sufficient for supporting updates, or whether I should
do something cool like RCU. :)


Nathan
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