rtc: rv8803: fix off-by-one in month counting

tm_mon has a range from 0..11, but the RTC expects 1..12. So we adapt
the month accordingly. This was determined when comparing the driver
with the corresponding linux kernel driver.

Signed-off-by: Oliver Graute <oliver.graute@kococonnector.com>
Reviewed-by: Michael Walle <michael@walle.cc>
Reviewed-by: Heiko Schocher <hs@denx.de>

diff --git a/drivers/rtc/rv8803.c b/drivers/rtc/rv8803.c
index 5bae39d6e09b1f90f3811da08bcdc129067a7597..06a4ae89fa961e788a5f8fc8f1385e6398ab288b 100644 (file)
--- a/drivers/rtc/rv8803.c
+++ b/drivers/rtc/rv8803.c
@@ -49,7 +49,7 @@ static int rv8803_rtc_set(struct udevice *dev, const struct rtc_time *tm)
                printf("WARNING: year should be between 2000 and 2099!\n");
 
        buf[RTC_YR_REG_ADDR] = bin2bcd(tm->tm_year % 100);
-       buf[RTC_MON_REG_ADDR] = bin2bcd(tm->tm_mon);
+       buf[RTC_MON_REG_ADDR] = bin2bcd(tm->tm_mon + 1);
        buf[RTC_DAY_REG_ADDR] = 1 << (tm->tm_wday & 0x7);
        buf[RTC_DATE_REG_ADDR] = bin2bcd(tm->tm_mday);
        buf[RTC_HR_REG_ADDR] = bin2bcd(tm->tm_hour);
@@ -90,7 +90,7 @@ static int rv8803_rtc_get(struct udevice *dev, struct rtc_time *tm)
        tm->tm_min  = bcd2bin(buf[RTC_MIN_REG_ADDR] & 0x7F);
        tm->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR] & 0x3F);
        tm->tm_mday = bcd2bin(buf[RTC_DATE_REG_ADDR] & 0x3F);
-       tm->tm_mon  = bcd2bin(buf[RTC_MON_REG_ADDR] & 0x1F);
+       tm->tm_mon  = bcd2bin(buf[RTC_MON_REG_ADDR] & 0x1F) - 1;
        tm->tm_year = bcd2bin(buf[RTC_YR_REG_ADDR]) + 2000;
        tm->tm_wday = fls(buf[RTC_DAY_REG_ADDR] & 0x7F) - 1;
        tm->tm_yday = 0;