for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++) {
                snprintf(buf, 32, "viocd@%08x", reg + i);
                dt_start_node(dt, buf);
-               dt_prop_str(dt, "device_type", "viocd");
-               dt_prop_str(dt, "compatible", "");
+               dt_prop_str(dt, "device_type", "block");
+               dt_prop_str(dt, "compatible", "IBM,iSeries-viocd");
                dt_prop_u32(dt, "reg", reg + i);
                dt_prop_u32(dt, "linux,unit_address", i);
                dt_end_node(dt);
        for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++) {
                snprintf(buf, 32, "viotape@%08x", reg + i);
                dt_start_node(dt, buf);
-               dt_prop_str(dt, "device_type", "viotape");
-               dt_prop_str(dt, "compatible", "");
+               dt_prop_str(dt, "device_type", "byte");
+               dt_prop_str(dt, "compatible", "IBM,iSeries-viotape");
                dt_prop_u32(dt, "reg", reg + i);
                dt_prop_u32(dt, "linux,unit_address", i);
                dt_end_node(dt);