On Aug 25, 2008, at 5:41 AM, Kevin Diggs wrote:

This adds a small module to handle the low level details of dealing  
with the
PLL config register (HID1) found in the IBM 750GX. It provides 2  
possible
interfaces, both selectable via kernel config options. One is a  
sysfs attribute
and the other is a normal function API. It is called pll_if.

The determination of the bus frequency is what worked on a PowerMac  
8600. Any
suggestions on a more general solution are welcome.

WARNING - I used some #ifdefs - Let the fur fly!

My name is Kevin Diggs and I approve this patch.

This really should be split into two patches.  One for the perl script  
and one for the actual kernel code.

Scanning the actual kernel code you have a lot of #ifdef's that should  
be cleaned up:

Can't #ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_SYSFS just be #ifdef  
CONFIG_SYSFS and the same for CONFIG_PPC_750GX_DUAL_PLL_IF_HRTIMER &  
CONFIG_PPC_750GX_DUAL_PLL_IF_CPU_FREQ?

#ifdef CONFIG_PPC_OF seems unnecessary as all PPC always has this set.

What's up with #define MULFIRST and the #if 0?

- k