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iio: adc: stm32-dfsdm: add comment for 16 bits record

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Add a comment on DMA configuration for 16 bits record.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Olivier Moysan 2019-06-19 15:03:51 +02:00 committed by Jonathan Cameron
parent d716204fd5
commit 18eaffab90
1 changed files with 5 additions and 0 deletions
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5
drivers/iio/adc/stm32-dfsdm-adc.c
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@ -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,