ath79_wdt_wr
ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_FCR);
ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_NONE);
ath79_wdt_wr(WDOG_REG_TIMER, wdt_freq * timeout);