devm_dma_request_chan
EXPORT_SYMBOL_GPL(devm_dma_request_chan);
host->dma_chan_rx = devm_dma_request_chan(dev, "rx");
host->dma_chan_tx = devm_dma_request_chan(dev, "tx");
aq->rx_chan = devm_dma_request_chan(&aq->pdev->dev, "rx");
aq->tx_chan = devm_dma_request_chan(&aq->pdev->dev, "tx");
spi->host->dma_rx = devm_dma_request_chan(spi->dev, "rx");
spi->host->dma_tx = devm_dma_request_chan(spi->dev, "tx");
controller->dma_tx = devm_dma_request_chan(dev, "tx");
controller->dma_rx = devm_dma_request_chan(dev, "rx");
struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name);