From: Olivier Moysan Date: Wed, 19 Jun 2019 13:03:51 +0000 (+0200) Subject: iio: adc: stm32-dfsdm: add comment for 16 bits record X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=18eaffab90eb3c2280986bb546e571adc85756d5;p=linux.git iio: adc: stm32-dfsdm: add comment for 16 bits record Add a comment on DMA configuration for 16 bits record. Signed-off-by: Olivier Moysan Acked-by: Fabrice Gasnier Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c index d855a605eab6e..ee1e0569d0e16 100644 --- a/drivers/iio/adc/stm32-dfsdm-adc.c +++ b/drivers/iio/adc/stm32-dfsdm-adc.c @@ -918,6 +918,11 @@ static void stm32_dfsdm_dma_buffer_done(void *data) static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev) { struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); + /* + * The DFSDM supports half-word transfers. However, for 16 bits record, + * 4 bytes buswidth is kept, to avoid losing samples LSBs when left + * shift is required. + */ struct dma_slave_config config = { .src_addr = (dma_addr_t)adc->dfsdm->phys_base, .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,