[PATCH v4 0/8] Clean gpio in arch-pxa and arch-mmp

[Haojian Zhuang]

Changelog
v4:
       1. append one patch for clean gpio macros and use function instead.
v3:
       1. Rebase on Russell's for-next branch.
       2. Add clock support.
       3. Move gpio edge detection initiliaztion of arch-mmp into gpio driver.

v2:
      1. Remove gpio.c from mach-pxa & mach-mmp that is introduced from v1.
      2. Remove init function in gpio.c. Move the platfrom_device_register()
         into platform driver.
      3. Initialize pxa_gpio_regs in gpio-pxa.c
      4. Simplify code of identifing pxa gpio series or mmp gpio series.
      5. Use linux/io.h instead of asm/io.h.