rtc: m41t80: set range

This is a standard BCD RTC that will fail in 2100. The century bits don't
help because 2100 will be considered a leap year while it is not.

Link: https://lore.kernel.org/r/20191003213544.5359-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-m41t80.c

@@ -235,9 +235,6 @@ static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	unsigned char buf[8];
 	int err, flags;
 
-	if (tm->tm_year < 100 || tm->tm_year > 199)
-		return -EINVAL;
-
 	buf[M41T80_REG_SSEC] = 0;
 	buf[M41T80_REG_SEC] = bin2bcd(tm->tm_sec);
 	buf[M41T80_REG_MIN] = bin2bcd(tm->tm_min);
@@ -925,6 +922,8 @@ static int m41t80_probe(struct i2c_client *client,
 	}
 
 	m41t80_data->rtc->ops = &m41t80_rtc_ops;
+	m41t80_data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	m41t80_data->rtc->range_max = RTC_TIMESTAMP_END_2099;
 
 	if (client->irq <= 0) {
 		/* We cannot support UIE mode if we do not have an IRQ line */