From: Andrew Morton <akpm@linux-foundation.org>
To: "Jüri Reitel" <juri.reitel@liewenthal.ee>
Cc: linux-kernel@vger.kernel.org,
David Brownell <david-b@pacbell.net>,
Jean Delvare <khali@linux-fr.org>,
Rodolfo Giometti <giometti@linux.it>,
rtc-linux@googlegroups.com
Subject: Re: invalid default values in RTC chip
Date: Thu, 16 Oct 2008 13:58:46 -0700 [thread overview]
Message-ID: <20081016135846.8b06d9f8.akpm@linux-foundation.org> (raw)
In-Reply-To: <48F45FA5.6040308@liewenthal.ee>
On Tue, 14 Oct 2008 12:00:21 +0300
J__ri Reitel <juri.reitel@liewenthal.ee> wrote:
> Hi,
>
> My question relates to RTC driver linux/drivers/rtc/rtc-ds1307.c for
> device m41t00. Driver probe function will fail if some of the chip's
> registers contain invalid date time values i.e. if month register is 32
> or minutes is 61. Is this correct behavior? Probe function's purpose is
> to check if the device is as was assumed (this time RTC and it is). The
> chip's values are incorrect but the chip works, even the m41t00 chip
> manual states that after initial powerup (RTC battery power applied)
> internal registers will contain random data.
>
> There are two solutions first is driver patch and another is i2c-dev and
> i2cset tool to use from user space during bootup. Whitch one should be used?
>
(cc's added)
next prev parent reply other threads:[~2008-10-16 21:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-14 9:00 invalid default values in RTC chip Jüri Reitel
2008-10-16 20:58 ` Andrew Morton [this message]
2008-10-16 21:41 ` [rtc-linux] " Alessandro Zummo
2008-10-16 22:22 ` David Brownell
2008-10-23 7:43 ` Jüri Reitel
2008-10-23 9:04 ` David Brownell
2008-10-23 9:55 ` Jüri Reitel
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