CHIPC_PLL_SLOWCLK_CTL
clkreg = bhnd_bus_read_4(sc->res, CHIPC_PLL_SLOWCLK_CTL);
div = bhnd_bus_read_4(sc->res, CHIPC_PLL_SLOWCLK_CTL);
scc = bhnd_bus_read_4(sc->res, CHIPC_PLL_SLOWCLK_CTL);
bhnd_bus_write_4(sc->res, CHIPC_PLL_SLOWCLK_CTL, scc);
bhnd_bus_write_4(sc->res, CHIPC_PLL_SLOWCLK_CTL, scc);