The SH RTC is a BCD RTC with some version having 4 digits for the year.
The range for the RTCs with only 2 digits for the year was unfortunately
shifted to handle 1999 to 2098.
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
drivers/rtc/rtc-sh.c | 8 ++++++++
include/linux/rtc.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c
index b582af10ddb5..37964a867de7 100644
--- a/drivers/rtc/rtc-sh.c
+++ b/drivers/rtc/rtc-sh.c
@@ -601,6 +601,14 @@ static int __init sh_rtc_probe(struct platform_device *pdev)
rtc->rtc_dev->ops = &sh_rtc_ops;
rtc->rtc_dev->max_user_freq = 256;
+ if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
+ rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900;
+ rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_9999;
+ } else {
+ rtc->rtc_dev->range_min = mktime64(1999, 1, 1, 0, 0, 0);
+ rtc->rtc_dev->range_max = mktime64(2098, 12, 31, 23, 59, 59);
+ }
+
ret = rtc_register_device(rtc->rtc_dev);
if (ret)
goto err_unmap;
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index f89bfbb54902..588120ba372c 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -165,6 +165,7 @@ struct rtc_device {
#define RTC_TIMESTAMP_BEGIN_1900 -2208989361LL /* 1900-01-01 00:00:00 */
#define RTC_TIMESTAMP_BEGIN_2000 946684800LL /* 2000-01-01 00:00:00 */
#define RTC_TIMESTAMP_END_2099 4102444799LL /* 2099-12-31 23:59:59 */
+#define RTC_TIMESTAMP_END_9999 253402300799LL /* 9999-12-31 23:59:59 */
extern struct rtc_device *devm_rtc_device_register(struct device *dev,
const char *name,
--
2.20.1
