rtc: rv3029: let the core handle rtc range

Despite the comment, the RV3029 uses a 7bit BCD register for the year,
making 2079 the last supported year.

Link: https://lore.kernel.org/r/20191214221022.622482-14-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-rv3029c2.c

@@ -405,14 +405,6 @@ static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 	int ret;
 	u8 regs[8];
 
-	/*
-	 * The clock has an 8 bit wide bcd-coded register (they never learn)
-	 * for the year. tm_year is an offset from 1900 and we are interested
-	 * in the 2000-2099 range, so any value less than 100 is invalid.
-	*/
-	if (tm->tm_year < 100)
-		return -EINVAL;
-
 	/* Activate all the alarms with AE_x bit */
 	regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
 	regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
@@ -442,14 +434,6 @@ static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
 	u8 regs[8];
 	int ret;
 
-	/*
-	 * The clock has an 8 bit wide bcd-coded register (they never learn)
-	 * for the year. tm_year is an offset from 1900 and we are interested
-	 * in the 2000-2099 range, so any value less than 100 is invalid.
-	*/
-	if (tm->tm_year < 100)
-		return -EINVAL;
-
 	regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
 	regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
 	regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
@@ -751,6 +735,8 @@ static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
 	}
 
 	rv3029->rtc->ops = &rv3029_rtc_ops;
+	rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;
 
 	return rtc_register_device(rv3029->rtc);
 }

include/linux/rtc.h

@@ -167,6 +167,7 @@ struct rtc_device {
 #define RTC_TIMESTAMP_BEGIN_1900	-2208988800LL /* 1900-01-01 00:00:00 */
 #define RTC_TIMESTAMP_BEGIN_2000	946684800LL /* 2000-01-01 00:00:00 */
 #define RTC_TIMESTAMP_END_2063		2966371199LL /* 2063-12-31 23:59:59 */
+#define RTC_TIMESTAMP_END_2079		3471292799LL /* 2079-12-31 23:59:59 */
 #define RTC_TIMESTAMP_END_2099		4102444799LL /* 2099-12-31 23:59:59 */
 #define RTC_TIMESTAMP_END_2199		7258118399LL /* 2199-12-31 23:59:59 */
 #define RTC_TIMESTAMP_END_9999		253402300799LL /* 9999-12-31 23:59:59 */