rtc/m41t62: Add support for M41T82 with HT (Halt Update)

[karo-tx-uboot.git] / drivers / rtc / m41t62.c

diff --git a/drivers/rtc/m41t62.c b/drivers/rtc/m41t62.c
index 62c2446939607fcd89440303aa2ee3011ee03662..8721e7468ab615b37aac619a3e84fd1b6d10dad2 100644 (file)
--- 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