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Add spdifin spdifout nodes for Amlogic SM1 SoCs. Signed-off-by: Artem Lapkin <art@khadas.com> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> [narmstrong: subject and DT fixups from mailing-list review] Link: https://lore.kernel.org/r/20211215030236.340841-1-art@khadas.com