Hi Andy,
On 10/1/26 21:13, Andy Shevchenko wrote:
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 <[email protected]>
---
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.
Ok. I am preparing a v2 series to reduce the size of the patches.
Best Regards
olivier
