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Date: Wed, 18 Apr 2001 14:13:33 -0500 (CDT)
From: Grant Erickson <erick205@umn.edu>
To: Linux I2C Mailing List <linux-i2c@pelican.tk.uni-linz.ac.at>,
        Linux/PPC Embedded Mailing List 
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Subject: Kernel Real Time Clock (RTC) Support for I2C Devices
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I have been unable to find an answer for this in the LKML archives, so I
am hoping someone on this list might perhaps have some insight or pointers
thereto on this question.

I have an embedded board with a PowerPC 405GP on which Linux 2.4.2
(MontaVista's version thereof) is running swimmingly. Attached to that
PowerPC's I2C controller is a Dallas DS1307 I2C RTC.

>From the looks of drivers/char/rtc.c it would appear that this kernel
driver only supports bus-attached RTCs such as the mentioned MC146818. Is
this correct?

What is the correct access method / kernel tie-in for supporting such an
I2C-based RTC device using the "standard" interfaces?

My hope is to use 'hwclock' from util-linux w/o modification. Is this
reasonable?

Thanks,

Grant Erickson


-- 
 Grant Erickson                       University of Minnesota Alumni
  o mail:erick205@umn.edu                                 1996 BSEE
  o http://www.umn.edu/~erick205                          1998 MSEE


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