2008-10-22 19:30:45

by Michael Weiser

[permalink] [raw]
Subject: rtc/i2c-mpc stops working with 2.6.27 on Linkstation HG (powerpc)

Hello,

with 2.6.27(-gentoo) the rtc (Ricoh 5c372) is no longer found on my
Linkstation HG. It seems, the i2c-mpc driver doesn't even find the I2C
controller.

Could this be related to commit
#0d1cde235874b00905bce23f659690d060ebf475 (powerpc/i2c: Convert i2c-mpc
into an of_platform driver,
http://kerneltrap.org/mailarchive/git-commits-head/2008/7/16/2522594/thread)?

What do I need to do, to make it work again?

The configs are virtually identical. The kernels are loaded with their
respective dtb files. The dtb and dts files are identical anyways.
--
Thanks,
Micha


2008-10-23 18:30:24

by Guennadi Liakhovetski

[permalink] [raw]
Subject: Re: rtc/i2c-mpc stops working with 2.6.27 on Linkstation HG (powerpc)

On Wed, 22 Oct 2008, Michael Weiser wrote:

> Hello,
>
> with 2.6.27(-gentoo) the rtc (Ricoh 5c372) is no longer found on my
> Linkstation HG. It seems, the i2c-mpc driver doesn't even find the I2C
> controller.
>
> Could this be related to commit
> #0d1cde235874b00905bce23f659690d060ebf475 (powerpc/i2c: Convert i2c-mpc
> into an of_platform driver,
> http://kerneltrap.org/mailarchive/git-commits-head/2008/7/16/2522594/thread)?
>
> What do I need to do, to make it work again?
>
> The configs are virtually identical. The kernels are loaded with their
> respective dtb files. The dtb and dts files are identical anyways.

This is a known regression, see, e.g., here:

http://ozlabs.org/pipermail/linuxppc-dev/2008-October/064318.html

waiting for someone to find time to fix it.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer

2008-10-23 22:20:29

by Michael Weiser

[permalink] [raw]
Subject: Re: rtc/i2c-mpc stops working with 2.6.27 on Linkstation HG (powerpc)

On Thu, Oct 23, 2008 at 08:30:23PM +0200, Guennadi Liakhovetski wrote:

> > with 2.6.27(-gentoo) the rtc (Ricoh 5c372) is no longer found on my
> > Linkstation HG. It seems, the i2c-mpc driver doesn't even find the I2C
> > controller.

> This is a known regression, see, e.g., here:

> http://ozlabs.org/pipermail/linuxppc-dev/2008-October/064318.html

> waiting for someone to find time to fix it.

Cheers. I found the thread but not the pertinent posts - the web mail
archive I googled into must have been lagging. Sorry for the
duplication.
--
bye, Michael