RTC_INT_STS
status = readl(xrtcdev->reg_base + RTC_INT_STS);
writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_STS);
status = readl(xrtcdev->reg_base + RTC_INT_STS);
pending_alrm_irq = readl(xrtcdev->reg_base + RTC_INT_STS) & RTC_INT_ALRM;
writel(pending_alrm_irq, xrtcdev->reg_base + RTC_INT_STS);
writel(RTC_INT_SEC, xrtcdev->reg_base + RTC_INT_STS);
status = readl(xrtcdev->reg_base + RTC_INT_STS);