solved: Re: [rtc-linux] Re: DS1337 RTC on I2C broken.

Clemens Koller clemens.koller at
Tue Dec 4 03:09:52 EST 2007

Hello, Olof!

Clemens Koller schrieb:
> Hi, Alessandro, Hi, Olof!
> Olof Johansson wrote:
>  > ds1307 requires you to register i2c_board_info for it to probe properly.
>  > Does your platform do so?
> I started to add some pr_debug()s. It seems that rtc-ds1307's ds1307_init()
> is just never called despite the module gets loaded.

Finally, it works! *sigh* - Thank your for your hint to i2c_board_info!

My platform includes i2c_board_info with some i2c-devices but only uses them
if the device-tree includes the devices.

[OT+sarcasm on]

So, the time is over, where you just enable a driver in the kernel config and
the device gets probed and - if it's probed successfully - it usually works.
Now, the way is like this:

- enable the desired driver in the kernel.
- check that the platform driver fsl_soc.c (in my case) defines the
   desired rtc-chip in the i2c_board_info
- check that the rtc is included in the device tree.
- embed the device tree to the kernel (cuImage)
- boot'n'pray.

That looks really groundbreaking!

Now, I cannot use one kernel for two almost identical hardware revisions
anymore because the rtc's on i2c are different? This must be a joke!

It seems like I first need to have full device tree support included in
the boot-loader to be able to duplicate my configuration work to allow
one kernel to boot on both hardware. Hmmm... this just s****!

[OT+sarcasm off]

Thank you,

Clemens Koller
R&D Imaging Devices
Anagramm GmbH
Rupert-Mayer-Straße 45/1
Linhof Werksgelände
D-81379 München
Fax 089-741518-19

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