sxiccmu_d1_get_frequency
uint32_t sxiccmu_d1_get_frequency(struct sxiccmu_softc *, uint32_t);
freq = sxiccmu_d1_get_frequency(sc, D1_CLK_PLL_PERIPH0);
sxiccmu_d1_get_frequency(sc, D1_CLK_PLL_PERIPH0);
sc->sc_get_frequency = sxiccmu_d1_get_frequency;