dm: rtc: Rename to_tm() to rtc_to_tm() and add error code
Rename this function so that it is clear that it is provided by the RTC.
Also return an error when it cannot function as expected. This is unlikely
to occur since it works for dates since 1752 and many RTCs do not support
such old dates. Still it is better to be accurate.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/rtc/at91sam9_rtt.c b/drivers/rtc/at91sam9_rtt.c
index 714dd2a..d3cdee0 100644
--- a/drivers/rtc/at91sam9_rtt.c
+++ b/drivers/rtc/at91sam9_rtt.c
@@ -44,7 +44,7 @@
} while (tim!=tim2);
off = readl(&gpbr->reg[AT91_GPBR_INDEX_TIMEOFF]);
/* off==0 means time is invalid, but we ignore that */
- to_tm (tim+off, tmp);
+ rtc_to_tm(tim+off, tmp);
return 0;
}