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 v2] RTC/PCF85063: fix reading/setting time/date
Date: Tue, 9 Feb 2016 11:57:24 +0100 [thread overview]
Message-ID: <1455015447-13886-1-git-send-email-jbe@pengutronix.de> (raw)
The PCF85063 RTC needs special treatment while setting or reading the
time/date:
- when 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
Changes from v1:
- using high level I2C access functions instead of the low level i2c_transfer()
to simplify the code
Comments are welcome
Juergen
Please keep me on CC since I'm not subscribed to the list.
next reply other threads:[~2016-02-09 10:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-09 10:57 Juergen Borleis [this message]
2016-02-09 10:57 ` [PATCH v2 1/3] RTC/PCF85063: simplify code to read the current time Juergen Borleis
2016-02-09 10:57 ` [PATCH v2 2/3] RTC/PCF85063: fix time/date reading Juergen Borleis
2016-02-09 10:57 ` [PATCH v2 3/3] RTC/PCF85063: fix time/date setting Juergen Borleis
2016-02-23 23:04 ` [PATCH v2] RTC/PCF85063: fix reading/setting time/date Alexandre Belloni
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