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

[Jean Delvare]

On Mon, 30 Apr 2007 06:42:14 -0700 (PDT), z l wrote:
> 
> > i2c-algo-bit is a software thing only. You need an I2C bus driver
> > to bind it to the physical EEDAT & EECLK lines. I seem
> > to remember a driver named i2c-ep93xx, except that it is not in
> > mainline. I found this:
> > 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.

-- 
Jean Delvare