WCR_WT
reg &= ~WCR_WT;
reg |= __SHIFTIN(sc->sc_wdog_period * 2 - 1, WCR_WT);
reg &= ~WCR_WT;
reg |= __SHIFTIN(sc->sc_wdog_period * 2 - 1, WCR_WT);
reg &= ~WCR_WT;
reg |= __SHIFTIN(sc->sc_wdog_period * 2 - 1, WCR_WT);
reg &= ~WCR_WT;
reg |= __SHIFTIN(sc->sc_wdog_period * 2 - 1, WCR_WT);