Fan control for new PowerMac G5 2.7GHz machines?

[Benjamin Herrenschmidt]

> 
> i2c /dev entries driver
> /u3 at 0,f8000000/i2c at f8001000: Missing interrupt or address !
> 
> In therm_pm72_attach() it hits 'Found K2', but u3_0 and u3_1 
> are never set, so start_control_loops() is never called.
> 
> I'll look at it more when I have some time.

Ah yes, this is indeed the problem ! There is a bug in Apple device tree
on these machines that is breaking Linux. I should have a workaround
upstream, but for some reason, it seems it's not working for you.

Can you look at arch/ppc64/kernel/prom_init.c, more specifically, the
function

static void __init fixup_device_tree(void)

And see if it's going all the way to the fixup code at the end or not ?
If not, then one of the tests isn't triggering the right way on your
machine, possibly the U3 revision. 

Ben.