1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index 72086f0c0782..b0d45d23a11b 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -37,9 +37,11 @@
 
 /* Control register */
 #define SUN6I_LOSC_CTRL                         0x0000
+#define SUN6I_LOSC_CTRL_KEY                     (0x16aa << 16)
 #define SUN6I_LOSC_CTRL_ALM_DHMS_ACC            BIT(9)
 #define SUN6I_LOSC_CTRL_RTC_HMS_ACC             BIT(8)
 #define SUN6I_LOSC_CTRL_RTC_YMD_ACC             BIT(7)
+#define SUN6I_LOSC_CTRL_EXT_OSC                 BIT(0)
 #define SUN6I_LOSC_CTRL_ACC_MASK                GENMASK(9, 7)
 
 /* RTC */
@@ -417,6 +419,10 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
         /* disable alarm wakeup */
         writel(0, chip->base + SUN6I_ALARM_CONFIG);
 
+        /* switch to the external, more precise, oscillator */
+        writel(SUN6I_LOSC_CTRL_KEY | SUN6I_LOSC_CTRL_EXT_OSC,
+               chip->base + SUN6I_LOSC_CTRL);
+
         chip->rtc = rtc_device_register("rtc-sun6i", &pdev->dev,
                                         &sun6i_rtc_ops, THIS_MODULE);
         if (IS_ERR(chip->rtc)) {