linux-kernel - [PATCH 2/2] rtc: ds1685: Add range

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Message-Id: <20180531095643.8581-2-alexandre.belloni@bootlin.com>
Date:   Thu, 31 May 2018 11:56:43 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     linux-rtc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH 2/2] rtc: ds1685: Add range

Useful range is 2000-2099 because leap year fails on centuries.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-ds1685.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rtc/rtc-ds1685.c b/drivers/rtc/rtc-ds1685.c
index e6390475380f..5c0db6c8134c 100644
--- a/drivers/rtc/rtc-ds1685.c
+++ b/drivers/rtc/rtc-ds1685.c
@@ -2043,6 +2043,10 @@ ds1685_rtc_probe(struct platform_device *pdev)
 
 	rtc_dev->ops = &ds1685_rtc_ops;
 
+	/* Century bit is useless because leap year fails in 1900 and 2100 */
+	rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	rtc_dev->range_max = RTC_TIMESTAMP_END_2099;
+
 	/* Maximum periodic rate is 8192Hz (0.122070ms). */
 	rtc_dev->max_user_freq = RTC_MAX_USER_FREQ;
 
-- 
2.17.0