[linux-cirrus] classing simple board devices

I've added support for our new board by adding a mach/board.c file.
In this file I set up a virtual memory region for our PLD, which in the 
current revision provides some extra GPIO and PWMs.

These very relatively simple interfaces, I thought it would be appropriate to 
simply export the registers as attributes through sysfs.

I'm thinking that a logical approach would be to create a gpio class and pwm 
class, then name the individual devices based upon port names on the actual 
board. In this way the mach/board.c  would simply add gpio/pwm devices to an 
existing class, using their methods to read and write to the appropriate 
addresses. The standard gpio pwm's of the board could also fit into the same 
class, making their underlying connections transparent to the user, while 
exporting their attributes in a clean simple way.

The problem of course, is that no such class exists. I could create it 
specifically in my board initialization, but this seems hackey.

How would you feel about general gpio and pwm classes that were declared 
before board initialization?
Questions, comments, previous work?

thx,
NZG

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