rtc: sirfsoc: set range

This RTC is a 32bit counter running at 16Hz. This overflows every eight
years and a half. However, the driver uses the SW_VALUE register to store
the overflow, extending the counter to 64bit as long as the update happens
before the overflow.

Link: https://lore.kernel.org/r/20200305160452.27808-2-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-sirfsoc.c

@@ -346,6 +346,7 @@ static int sirfsoc_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(rtcdrv->rtc);
 
 	rtcdrv->rtc->ops = &sirfsoc_rtc_ops;
+	rtcdrv->rtc->range_max = (1ULL << 60) - 1;
 
 	rtcdrv->irq = platform_get_irq(pdev, 0);
 	err = devm_request_irq(&pdev->dev, rtcdrv->irq, sirfsoc_rtc_irq_handler,