Re: [PATCH 2/3] iio: adc: add stm32 mdf support

[Andy Shevchenko]

On Thu, Oct 01, 2026 at 04:56:46PM +0200, Olivier Moysan wrote:
> Add the STM32 Multi-function Digital Filter (MDF) core, serial interface
> and digital filter drivers. The MDF converts bitstreams from sigma-delta
> modulators or digital microphones into samples exposed through IIO.
> 
> Audio: capture PDM microphones via cyclic DMA for an ASoC consumer.
> Support CIC scaling and filtering, synchronized and interleaving modes.
> Audio use case requires a DMIC filter, and a separate ASoC DAI.
> 
> Analog: expose sigma-delta modulators as IIO voltage channels with
> direct reads or DMA buffering mode. STM32 timer triggers can be used as
> clock source.
> Analog use case requires an IIO backend for the SD modulator.
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
> ---
>  drivers/iio/adc/Kconfig               |   27 +
>  drivers/iio/adc/Makefile              |    3 +
>  drivers/iio/adc/stm32-mdf-adc.c       | 2078 +++++++++++++++++++++++++
>  drivers/iio/adc/stm32-mdf-core.c      |  857 ++++++++++
>  drivers/iio/adc/stm32-mdf-serial.c    |  309 ++++
>  drivers/iio/adc/stm32-mdf.h           |  312 ++++
>  include/linux/iio/adc/stm32-mdf-adc.h |   19 +
>  7 files changed, 3605 insertions(+)

Unreviewable. Make sure the single patch is ~750 lines.


-- 
With Best Regards,
Andy Shevchenko