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path: root/drivers/rtc/m41t62.c
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Diffstat (limited to 'drivers/rtc/m41t62.c')
-rw-r--r--drivers/rtc/m41t62.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/rtc/m41t62.c b/drivers/rtc/m41t62.c
index 62c2446..8721e74 100644
--- a/drivers/rtc/m41t62.c
+++ b/drivers/rtc/m41t62.c
@@ -63,6 +63,8 @@
#define M41T62_FEATURE_HT (1 << 0)
#define M41T62_FEATURE_BL (1 << 1)
+#define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */
+
int rtc_get(struct rtc_time *tm)
{
u8 buf[M41T62_DATETIME_REG_SIZE];
@@ -132,9 +134,15 @@ int rtc_set(struct rtc_time *tm)
void rtc_reset(void)
{
+ u8 val;
+
/*
- * Nothing to do
+ * M41T82: Make sure HT (Halt Update) bit is cleared.
+ * This bit is 0 in M41T62 so its save to clear it always.
*/
+ i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1);
+ val &= ~M41T80_ALHOUR_HT;
+ i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1);
}
#endif