[i2c] problem with DS1337 RTC connected to Cirrus Logic EP93XX

[Alessandro Zummo]

On Fri, 4 May 2007 15:16:12 +0200
Jean Delvare <khali at linux-fr.org> wrote:

> > > https://dev.contec.at/dev/micro/micro9/LINUX/trunk/kernel/linux-2.6/patches/ep93xx-i2c-bus.diff
> > > But I don't know how up-to-date it is. You may want
> > > to contact Lennert
> > > Buytenhek for a status update.
> > 
> > I found a version in Michael Burian's GIT tree at
> > http://git.kernel.org/?p=linux/kernel/git/mburian/linux-2.6-ep93xx.git;a=blob_plain;f=drivers/i2c/busses/i2c-ep93xx.c;hb=e16e2f3f0a126eccf47d4d338b3b1a9281b7cd87
> >  and applied it against the 2.6.20.  I also used his
> > ds1337glue.c to create the RTC device interface so the
> > RTC can be accessed from user space.  It works very
> > well now.  We can use hwclcok to set and get time to
> > ds1337.  As Michael mentioned the ds1337glue probably
> > is not the "correct" way of doing it, but we need a
> > solution now so we will use it until the correct
> > access method is available.
> 
> There is a lot of efforts put into improving the RTC support in Linux.
> I suggest that you contact Alessandro Zummo (Cc'd) or even post to the
> rtc-linux list (see MAINTAINERS) and see what can be done to fix the
> problem.

 Lennert had a known working and very well written bus driver. I don't know
 if it is scheduled to be upstreamed.the new rtc subsystem works flawlessy
 on top of it.

--

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it