Commit ae862e35 authored Jan 07, 2020 by Peter Ujfalusi Committed by Greg Kroah-Hartman May 27, 2020

iio: adc: stm32-dfsdm: Use dma_request_chan() instead dma_request_slave_channel()



[ Upstream commit a9ab624edd9186fbad734cfe5d606a6da3ca34db ]

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Olivier Moysan <olivier.moysan@st.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 90af01f6

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

+7 −3

Original line number	Diff line number	Diff line
		@@ -933,9 +933,13 @@ static int stm32_dfsdm_dma_request(struct iio_dev *indio_dev)
		};
		int ret;

		adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx");
		if (!adc->dma_chan)
		return -EINVAL;
		adc->dma_chan = dma_request_chan(&indio_dev->dev, "rx");
		if (IS_ERR(adc->dma_chan)) {
		int ret = PTR_ERR(adc->dma_chan);

		adc->dma_chan = NULL;
		return ret;
		}

		adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev,
		DFSDM_DMA_BUFFER_SIZE,