  We discuss the correlation between the CP violating Dirac phase of the lepton
mixing matrix and the cosmological baryon asymmetry based on the leptogenesis
in the minimal seesaw model with two right-handed Majorana neutrinos and the
trimaximal mixing for neutrino flavors. The sign of the CP violating Dirac
phase at low energy is fixed by the observed cosmological baryon asymmetry
since there is only one phase parameter in the model. According to the recent
T2K and NO$\nu$A data of the CP violation, the Dirac neutrino mass matrix of
our model is fixed only for the normal hierarchy of neutrino masses.
