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We discuss two different configurations of U_PMNS=U_l^dagger U_nu withmaximal mixings in both U_l and U_nu. The non-maximal mixing angles are assumedto be small, which means that they can be expanded in. Since we areparticularly interested in the implications for CP violation, we fully takeinto account complex phases. We demonstrate that one possibility leads tointrinsically large theta_13 and strong deviations from maximal mixings. Theother possibility is generically close to tri-bimaximal mixing, and allows forlarge CP violation. We demonstrate how the determination of the theta_23 octantand the precision measurement of delta_CP could discriminate among differentqualitative sub-cases. In order to constrain the unphysical and observablephases even further, we relate our configurations to complex mass matrixtextures. In particular, we focus on phase patterns which could be generated bypowers of a single complex quantity eta=theta_C exp(i Phi), which can bemotivated by Froggatt-Nielsen-like models. For example, it turns out that inall of the discussed cases, one of the Majorana phases is proportional to Phito leading order. In the entire study, we encounter three different classes ofsum rules, which we systematically classify.

Entangled maximal mixings in U_PMNS=U_l^dagger U_nu, and a connection to complex mass textures