rtc: pcap: set range

While PCAP_RTC_DAY_MASK is set to 0x3ffff, it is very unlikely to be
correct as this ends in june 1992, before the product even existed. It is
more likely to be a 14-bit day counter. The next product in the family (the
mc13xxx) has a 15-bit day counter.

The same issue is seen with PCAP_RTC_TOD_MASK which only has 65535 seconds
and falls short of the necessary 86400 seconds.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-pcap.c

@@ -149,11 +149,13 @@ static int __init pcap_rtc_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, pcap_rtc);
 
-	pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap",
-					&pcap_rtc_ops, THIS_MODULE);
+	pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(pcap_rtc->rtc))
 		return PTR_ERR(pcap_rtc->rtc);
 
+	pcap_rtc->rtc->ops = &pcap_rtc_ops;
+	pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1;
+
 	timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
 	alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
 
@@ -167,7 +169,7 @@ static int __init pcap_rtc_probe(struct platform_device *pdev)
 	if (err)
 		return err;
 
-	return 0;
+	return rtc_register_device(pcap_rtc->rtc);
 }
 
 static int __exit pcap_rtc_remove(struct platform_device *pdev)