ASoC: add bindings for stm32 DFSDM filter
Add bindings that describes audio settings to support Digital Filter for pulse density modulation(PDM) microphone. Signed-off-by: NArnaud Pouliquen <arnaud.pouliquen@st.com> Acked-by: NRob Herring <robh@kernel.org> Signed-off-by: NMark Brown <broonie@kernel.org>
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