of_dma_request_slave_channel
chan = of_dma_request_slave_channel(to_of_node(fwnode), name);
EXPORT_SYMBOL_GPL(of_dma_request_slave_channel);
extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
return of_dma_request_slave_channel(cl->host->dev->of_node, name);
chan = of_dma_request_slave_channel(np, x);
chan = of_dma_request_slave_channel(dev->of_node, dma_names[is_play]);