Consolidate of_get_parent
This requires creating dummy of_node_{get,put} routines for sparc and sparc64. It also adds a read_lock around the parent accesses. Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au> Acked-by: NPaul Mackerras <paulus@samba.org> Acked-by: NDavid S. Miller <davem@davemloft.net>
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