00-INDEX
  	- This file
  gpio.txt
  	- Introduction to GPIOs and their kernel interfaces
  consumer.txt
  	- How to obtain and use GPIOs in a driver
  driver.txt
  	- How to write a GPIO driver
  board.txt
  	- How to assign GPIOs to a consumer device and a function
  sysfs.txt
  	- Information about the GPIO sysfs interface
  gpio-legacy.txt
  	- Historical documentation of the deprecated GPIO integer interface