iio: adc: stm32-dfsdm: move dma enable from start_conv() to start_dma()

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Move DMA enable (e.g. set RDMAEN bit) away from start_conv() that is used
for both buffer and single conversions. Thus, single conv rely on
interrupt, not dma.
Note: take care to prepare all DMA stuff and set RDMAEN before starting
filter (can be set only when DFEN=0).

This is precursor patch to ease support of triggered buffer mode.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Fabrice Gasnier 2019-03-21 17:47:24 +01:00 • committed by Jonathan Cameron

parent 6f2c4a59d9

commit caf9c1e598

1 changed files with 38 additions and 39 deletions

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

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