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authorStefan Roese <sr@denx.de>2012-01-20 11:47:47 +0100
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-07-07 14:07:43 +0200
commit038f3c54ba9a7ab4552943f47efe8f05736b1732 (patch)
tree8776c22b738eff422af4b26ebd3399220c3e0a71
parent4ae8bc4392ec038566276e15c4dfe29f0fe9682f (diff)
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rtc/m41t62: Add support for M41T82 with HT (Halt Update)
Add support for the M41T82 RTC to the m41t62 driver. The only difference that needs to be handled by this driver, is to clear the HT (Halt Update) bit upon reset. This bit is not used on the M41T62, so its save to clear this bit always. The M41T82 support will be used by the X600 (SPEAr600) board support. Signed-off-by: Stefan Roese <sr@denx.de>
-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