[PATCH 3/3] rtc: sh: set range

[Alexandre Belloni <alexandre.belloni@bootlin.com>]

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@bootlin.com>
---
 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