of_graph: add of_graph_get_endpoint_count()
OF graph want to count its endpoint number, same as of_get_child_count(). This patch adds of_graph_get_endpoint_count() Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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