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authorBenoît Thébaudeau <benoit.thebaudeau@advansee.com>2012-07-20 16:05:36 +0200
committerWolfgang Denk <wd@denx.de>2012-09-02 17:31:00 +0200
commitdf930e9b3c6a644d1b0b50dce31fc9f4686925c2 (patch)
tree78cc9c286d400cff53a058e176b1230dc82ac3f5
parent0880e5bb0c638aec47c1f9349bbb9a0f48179313 (diff)
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rtc: pcf8563: Make century compatible with Linux
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.thebaudeau@advansee.com> Cc: Wolfgang Denk <wd@denx.de>
-rw-r--r--drivers/rtc/pcf8563.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/rtc/pcf8563.c b/drivers/rtc/pcf8563.c
index 339e5f6..a028533 100644
--- a/drivers/rtc/pcf8563.c
+++ b/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));