s = &dev->subdevices[0];
        if (this_board->di_nchan) {
                s->type = COMEDI_SUBD_DI;
-               s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_COMMON;
+               s->subdev_flags = SDF_READABLE;
                s->n_chan = this_board->di_nchan;
                s->maxdata = 1;
                s->range_table = &range_digital;
        s = &dev->subdevices[1];
        if (this_board->do_nchan) {
                s->type = COMEDI_SUBD_DO;
-               s->subdev_flags =
-                       SDF_READABLE | SDF_WRITEABLE | SDF_GROUND | SDF_COMMON;
+               s->subdev_flags = SDF_WRITEABLE;
                s->n_chan = this_board->do_nchan;
                s->maxdata = 1;
                s->range_table = &range_digital;
        s = &dev->subdevices[2];
        if (this_board->has_timer) {
                s->type = COMEDI_SUBD_TIMER;
-               s->subdev_flags = SDF_WRITEABLE | SDF_GROUND | SDF_COMMON;
+               s->subdev_flags = SDF_WRITEABLE;
                s->n_chan = 1;
                s->maxdata = 0;
                s->range_table = &range_digital;