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Even though we had the wm8978 driver for some time and a number of boards using it already, we never had a binding for it. Let's add it based on what the driver expects and the boards are providing. Cc: alsa-devel@alsa-project.org Cc: devicetree@vger.kernel.org Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Mark Brown <broonie@kernel.org> Cc: patches@opensource.cirrus.com Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/20210901091852.479202-2-maxime@cerno.tech Signed-off-by: Mark Brown <broonie@kernel.org>