IIO: ADC: add STM32 DFSDM sigma delta ADC support
Add DFSDM driver to handle sigma delta ADC. Signed-off-by:Arnaud Pouliquen <arnaud.pouliquen@st.com> Reviewed-by:
Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by:
Mark Brown <broonie@kernel.org>
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