nwl_dsi_read
val = nwl_dsi_read(dsi, NWL_DSI_RX_PKT_HEADER);
val = nwl_dsi_read(dsi, NWL_DSI_RX_PAYLOAD);
val = nwl_dsi_read(dsi, NWL_DSI_RX_PAYLOAD);
irq_status = nwl_dsi_read(dsi, NWL_DSI_IRQ_STATUS);