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Commit 18eaffab authored by Olivier Moysan's avatar Olivier Moysan Committed by Jonathan Cameron
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iio: adc: stm32-dfsdm: add comment for 16 bits record 



Add a comment on DMA configuration for 16 bits record.

Signed-off-by: default avatarOlivier Moysan <olivier.moysan@st.com>
Acked-by: default avatarFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent d716204f

drivers/iio/adc/stm32-dfsdm-adc.c

+5 −0
Original line number Diff line number Diff line
@@ -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,