This driver uses the century bit of this RTC in the opposite way Linux does.
From Linux's rtc-pcf8563.c:
/*
* The meaning of MO_C bit varies by the chip type.
* From PCF8563 datasheet: this bit is toggled when the years
* register overflows from 99 to 00
* 0 indicates the century is 20xx
* 1 indicates the century is 19xx
* From RTC8564 datasheet: this bit indicates change of
* century. When the year digit data overflows from 99 to 00,
* this bit is set. By presetting it to 0 while still in the
* 20th century, it will be set in year 2000, ...
* There seems no reliable way to know how the system use this
* bit. So let's do it heuristically, assuming we are live in
* 1970...2069.
*/
As U-Boot's PCF8563 driver does not say it is supposed to support the RTC8564,
make this driver compatible with Linux's by giving the opposite meaning to the
century bit.
Signed-off-by: Benoît Thébaudeau <benoit.thebaud...@advansee.com>
Cc: Wolfgang Denk <w...@denx.de>
---
.../drivers/rtc/pcf8563.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git u-boot-66714b1.orig/drivers/rtc/pcf8563.c
u-boot-66714b1/drivers/rtc/pcf8563.c
index 339e5f6..a028533 100644
--- u-boot-66714b1.orig/drivers/rtc/pcf8563.c
+++ u-boot-66714b1/drivers/rtc/pcf8563.c
@@ -72,7 +72,7 @@ int rtc_get (struct rtc_time *tmp)
tmp->tm_hour = bcd2bin (hour & 0x3F);
tmp->tm_mday = bcd2bin (mday & 0x3F);
tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
- tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
+ tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
tmp->tm_wday = bcd2bin (wday & 0x07);
tmp->tm_yday = 0;
tmp->tm_isdst= 0;
@@ -94,7 +94,7 @@ int rtc_set (struct rtc_time *tmp)
rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
- century = (tmp->tm_year >= 2000) ? 0x80 : 0;
+ century = (tmp->tm_year >= 2000) ? 0 : 0x80;
rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
rtc_write (0x06, bin2bcd(tmp->tm_wday));
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