[PATCH v5 00/11] change gpio as platform driver

[Haojian Zhuang]

Changelog
v5:
      1. use generic gpio driver. So clean gpio-pxa.h and gpio-pxa.c again.
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.