chan2parent
dma_unmap_single(chan2parent(chan), desc->txd.phys,
desc->txd.phys = dma_map_single(chan2parent(&dc->chan), &desc->hwdesc,
dma_sync_single_for_cpu(chan2parent(&dc->chan),
dma_sync_single_for_cpu(chan2parent(&dc->chan),
dma_sync_single_for_device(chan2parent(&dc->chan),
dma_sync_single_for_device(chan2parent(&dc->chan),
dma_sync_single_for_device(chan2parent(&dc->chan),
dma_sync_single_for_device(chan2parent(&dc->chan),
dma_sync_single_for_device(chan2parent(&dc->chan),
dma_sync_single_for_device(chan2parent(&dc->chan),