rk3308_get_frequency
return rk3308_get_frequency(sc, &idx) / (div_con + 1);
return rk3308_get_frequency(sc, &pll) / (div_con + 1);
uint32_t rk3308_get_frequency(void *, uint32_t *);
rk3308_enable, rk3308_get_frequency,