From: Juergen Borleis <jbe@pengutronix.de>
To: rtc-linux@googlegroups.com
Cc: Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@free-electrons.com>,
linux-kernel@vger.kernel.org, kernel@pengutronix.de
Subject: [PATCH] RTC/PCF85063: fix reading/setting time/date
Date: Mon, 7 Dec 2015 14:49:31 +0100 [thread overview]
Message-ID: <1449496174-7813-1-git-send-email-jbe@pengutronix.de> (raw)
The PCF85063 RTC needs special treatment while setting or reading the
time/date:
- while reading the 7 time/date registers they are blocked from updating by
the one second pulse internally. So reading all time/date registers should
happen in one turn to ensure reading is an atomic operation
- to let setting the time/date be an atomic operation as well, the clock
dividers must be kept in reset state to avoid a one second pulse during
writing the 7 time/date registers
Patch 1 and 2 change reading the time/date. I have kept them separately for
easier review. Squasching both into one patch render it more or less
unreadable.
Patch 3 changes setting the time/date.
Comments are welcome
Juergen
Please keep me on CC as I'm not subscribed to the list.
next reply other threads:[~2015-12-07 13:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-07 13:49 Juergen Borleis [this message]
2015-12-07 13:49 ` [PATCH 1/3] RTC/PCF85063: fix time/date reading (part 1) Juergen Borleis
2015-12-07 13:49 ` [PATCH 2/3] RTC/PCF85063: fix time/date reading (part II) Juergen Borleis
2015-12-20 11:35 ` Alexandre Belloni
2016-01-07 10:12 ` Juergen Borleis
2016-01-21 0:04 ` Alexandre Belloni
2015-12-07 13:49 ` [PATCH 3/3] RTC/PCF85063: fix time/date setting Juergen Borleis
2015-12-20 11:46 ` Alexandre Belloni
2016-01-07 10:13 ` Juergen Borleis
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