CV_SMB_CTRL
rv = wm_gmii_hv_readreg_locked(sc->sc_dev, 2, CV_SMB_CTRL, &phyreg);
rv = wm_gmii_hv_readreg_locked(sc->sc_dev, 2, CV_SMB_CTRL,
wm_gmii_hv_writereg_locked(sc->sc_dev, 2, CV_SMB_CTRL, phyreg);
CV_SMB_CTRL, &phyreg);
CV_SMB_CTRL, phyreg);