Ian Lepore 274245c881 Create a mechanism for looking up a device_t associated with an ofw/fdt
xref handle, and for registering that association.  Also use the same data
for faster translations between node and xref handles.

Now when fdt properties contain &othernode references, a driver can find
the device instance that corresponds to &othernode, and thus can use
interfaces provided by that instance.

Reviewed by:	nwhitehorn
2014-09-01 22:40:31 +00:00
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