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-rw-r--r--drivers/rtc/rtc-zynqmp.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
index 8b28762..6adb603 100644
--- a/drivers/rtc/rtc-zynqmp.c
+++ b/drivers/rtc/rtc-zynqmp.c
@@ -45,6 +45,7 @@
#define RTC_INT_SEC BIT(0)
#define RTC_INT_ALRM BIT(1)
#define RTC_OSC_EN BIT(24)
+#define RTC_BATT_EN BIT(31)
#define RTC_CALIB_DEF 0x198233
#define RTC_CALIB_MASK 0x1FFFFF
@@ -122,6 +123,13 @@ static int xlnx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
static void xlnx_init_rtc(struct xlnx_rtc_dev *xrtcdev, u32 calibval)
{
+ u32 rtc_ctrl;
+
+ /* Enable RTC switch to battery when VCC_PSAUX is not available */
+ rtc_ctrl = readl(xrtcdev->reg_base + RTC_CTRL);
+ rtc_ctrl |= RTC_BATT_EN;
+ writel(rtc_ctrl, xrtcdev->reg_base + RTC_CTRL);
+
/*
* Based on crystal freq of 33.330 KHz
* set the seconds counter and enable, set fractions counter
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