  Generating and manipulating Dirac points in artificial atomic crystals has
received attention especially in photonic systems due to their ease of
implementation. In this paper, we propose a two-dimensional photonic crystal
made of a Kekul\'e lattice of pure dielectrics, where the internal rotation of
cylindrical pillars induces optical Dirac-degeneracy breaking. Our calculated
dispersion reveals that the synchronized rotation reverses bands and switches
parity as well so as to induce a topological phase transition. Our simulation
demonstrates that such topologically protected edge states can achieve robust
transmission in defect waveguides under deformation, and therefore provides a
pragmatically tunable scheme to achieve reconfigurable topological phases.
