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The prefix is used for printing purpose before a node, and it also works as a separator between two nodes. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Acked-by: Rob Herring <robh@kernel.org> (for OF) Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>