Commit 735404b8 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Jonathan Cameron

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

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: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: default avatarFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent a9ab624e
...@@ -1796,9 +1796,21 @@ static int stm32_adc_dma_request(struct iio_dev *indio_dev) ...@@ -1796,9 +1796,21 @@ static int stm32_adc_dma_request(struct iio_dev *indio_dev)
struct dma_slave_config config; struct dma_slave_config config;
int ret; int ret;
adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx"); adc->dma_chan = dma_request_chan(&indio_dev->dev, "rx");
if (!adc->dma_chan) if (IS_ERR(adc->dma_chan)) {
ret = PTR_ERR(adc->dma_chan);
if (ret != -ENODEV) {
if (ret != -EPROBE_DEFER)
dev_err(&indio_dev->dev,
"DMA channel request failed with %d\n",
ret);
return ret;
}
/* DMA is optional: fall back to IRQ mode */
adc->dma_chan = NULL;
return 0; return 0;
}
adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev, adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev,
STM32_DMA_BUFFER_SIZE, STM32_DMA_BUFFER_SIZE,
......
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