pktdma_get_regs
dma->reg_global = pktdma_get_regs(dma, node, 0, &size);
dma->reg_tx_chan = pktdma_get_regs(dma, node, 1, &size);
dma->reg_rx_chan = pktdma_get_regs(dma, node, 2, &size);
dma->reg_tx_sched = pktdma_get_regs(dma, node, 3, &size);
dma->reg_rx_flow = pktdma_get_regs(dma, node, 4, &size);