rsnd_dma_addr
struct rsnd_dma_addr capture[3];
struct rsnd_dma_addr playback[3];
const struct rsnd_dma_addr *addr;
dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0);