RZN1_RTC_CTL2
val = readl(rtc->base + RZN1_RTC_CTL2);
writel(RZN1_RTC_CTL2_WAIT, rtc->base + RZN1_RTC_CTL2);
ret = readl_poll_timeout(rtc->base + RZN1_RTC_CTL2, val,
writel(0, rtc->base + RZN1_RTC_CTL2);
ret = readl_poll_timeout(rtc->base + RZN1_RTC_CTL2, ctl2,
val = readl(rtc->base + RZN1_RTC_CTL2);