sunxi_ccu_div_set_rate
error = sunxi_ccu_div_set_rate(sc, clk, rate);
int sunxi_ccu_div_set_rate(struct sunxi_ccu_softc *,
.set_rate = sunxi_ccu_div_set_rate, \
error = sunxi_ccu_div_set_rate(sc, clk, new_rate);