Documentation/ABI: /sys/class/gpio

Provide summary ABI docs about the /sys/class/gpio files.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/ABI/testing/sysfs-gpio b/Documentation/ABI/testing/sysfs-gpio
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+What:          /sys/class/gpio/
+Date:          July 2008
+KernelVersion: 2.6.27
+Contact:       David Brownell <dbrownell@users.sourceforge.net>
+Description:
+
+  As a Kconfig option, individual GPIO signals may be accessed from
+  userspace.  GPIOs are only made available to userspace by an explicit
+  "export" operation.  If a given GPIO is not claimed for use by
+  kernel code, it may be exported by userspace (and unexported later).
+  Kernel code may export it for complete or partial access.
+
+  GPIOs are identified as they are inside the kernel, using integers in
+  the range 0..INT_MAX.  See Documentation/gpio.txt for more information.
+
+    /sys/class/gpio
+       /export ... asks the kernel to export a GPIO to userspace
+       /unexport ... to return a GPIO to the kernel
+       /gpioN ... for each exported GPIO #N
+           /value ... always readable, writes fail for input GPIOs
+           /direction ... r/w as: in, out (default low); write: high, low
+       /gpiochipN ... for each gpiochip; #N is its first GPIO
+           /base ... (r/o) same as N
+           /label ... (r/o) descriptive, not necessarily unique
+           /ngpio ... (r/o) number of GPIOs; numbered N to N + (ngpio - 1)
+