[RFC/PATCH 2/3] of: add of_lookup_stdout() utility function

[David Miller]

From: Grant Likely <grant.likely at secretlab.ca>
Date: Wed, 06 Aug 2008 00:02:44 -0600

> of_lookup_stdout() is useful for figuring out what device to use as output
> for early boot progress messages.  It returns the node pointed to by the
> linux,stdout-path property in the chosen node.
> 
> Signed-off-by: Grant Likely <grant.likely at secretlab.ca>

On sparc platforms this is obtained differently.  We obtain the 32-bit
instance value of "/chosen/stdout" and convert that into a prom device
node path using "instance-to-path".

If this of_lookup_stdout() is going into generic OF code, it should be
done in a way that works on all platforms.  All of these "linux,*"
properties and node names are powerpc platform specific.