[K42-discussion] G5 thermal management patches for kitchsrc and linux-029

[Patrick Bozeman]

The G5 thermal management seems to be working for me under K42 now using
the attached patches.  There are 3 required patches, and 1 optional patch.

Without applying the interrupts patch, the system will crash on boot. 
The thermal patches keep the fans from spinning up to 100% when not
needed, which gets *very* loud.

Note that the previous patch I sent avoided the crash due to the guard
in i2c-keywest, but it wasn't actually fixing up the OF tree.  I didn't
realize that K42 wasn't using the linux prom init code and was using a
private copy of it in the kitchsrc powerpc arch directory instead.

k42-g5-interrupts.patch:
Fixes up the i2c interrupts on newer G5s during the prom init code in
K42.  Without either this or the g5-interrupts.patch for linux-029,
newer G5's will crash at bootup.

k42-g5-therm.patch:
Enables therm_pm72 in powerpc/ConfigureArch.c  Someone had previously
commented out the therm_pm72_init call though.  Does anyone know why?

g5-therm.patch:
Updates linux-029 to use the linux-2.6.12 therm_pm72 thermal management
code.

g5-interrupts.patch: (optional)
Fixes up the i2c interrupts in linux-029's prom init code.  When running
under K42, this isn't needed since K42 is responsible for reading the OF
device tree.  However, if anyone were to build and boot the linux-029
kernel directly on a newer G5, they will need this patch.  This patch
also places a guard in i2c-keywest.c that avoids dereferencing null
pointers on buggy OF tress that haven't been fixed up.  Since
k42-g5-interrupts.patch has already fixed the tree up, this is for
future safety only.





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