chan_to_axi_dmac
struct device *dev = chan_to_axi_dmac(chan)->dma_dev.dev;
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
struct device *dev = chan_to_axi_dmac(chan)->dma_dev.dev;
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
struct axi_dmac *dmac = chan_to_axi_dmac(chan);