linux-kernel - [PATCH v2 2/9] rtc: isl12022: specify range_min and range

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Message-Id: <20220921114624.3250848-3-linux@rasmusvillemoes.dk>
Date:   Wed, 21 Sep 2022 13:46:17 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/9] rtc: isl12022: specify range_min and range_max

The isl12022 can (only) keep track of times in the range
2000-2099. The data sheet says

  The calendar registers track date, month, year, and day of the week
  and are accurate through 2099, with automatic leap year correction.

The lower bound of 2000 is obtained by simply observing that its YR
register only counts from 00 through 99.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 drivers/rtc/rtc-isl12022.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/rtc/rtc-isl12022.c b/drivers/rtc/rtc-isl12022.c
index 2dc19061cf5f..3bc197f5548f 100644
--- a/drivers/rtc/rtc-isl12022.c
+++ b/drivers/rtc/rtc-isl12022.c
@@ -251,6 +251,8 @@ static int isl12022_probe(struct i2c_client *client)
 		return PTR_ERR(isl12022->rtc);
 
 	isl12022->rtc->ops = &isl12022_rtc_ops;
+	isl12022->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	isl12022->rtc->range_max = RTC_TIMESTAMP_END_2099;
 
 	return devm_rtc_register_device(isl12022->rtc);
 }
-- 
2.37.2