devclass_create
dc = devclass_create(classname);
class->bsdclass = devclass_create(class->name);
dc = pdrv->isdrm ? devclass_create("vgapci") : devclass_find("pci");
dc = devclass_create("vgapci");
firewire_devclass = devclass_create("firewire");
pcm_devclass = devclass_create("pcm");
tdfx_devclass = devclass_create("tdfx");
dc = devclass_create(driver);
devclass_t devclass_create(const char *classname);