[PATCH 5/6] gpio: add a userspace character device ABI

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

Put in some documentation for the new character device ABI
so we can properly etch it in stone.

Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 Documentation/ABI/testing/gpio-cdev | 26 ++++++++++++++++++++++++++
 MAINTAINERS                         |  1 +
 2 files changed, 27 insertions(+)
 create mode 100644 Documentation/ABI/testing/gpio-cdev

diff --git a/Documentation/ABI/testing/gpio-cdev b/Documentation/ABI/testing/gpio-cdev
new file mode 100644
index 000000000000..7b265fbb47e3
--- /dev/null
+++ b/Documentation/ABI/testing/gpio-cdev
@@ -0,0 +1,26 @@
+What:		/dev/gpiochip[0-9]+
+Date:		November 2015
+KernelVersion:	4.4
+Contact:	linux-gpio@xxxxxxxxxxxxxxx
+Description:
+		The character device files /dev/gpiochip* are the interface
+		between GPIO chips and userspace.
+
+		The ioctl(2)-based ABI is defined and documented in
+		[include/uapi]<linux/gpio.h>.
+
+		The following file operations are supported:
+
+		open(2)
+		Currently the only useful flags are O_RDWR.
+
+		ioctl(2)
+		Initiate various actions.
+		See the inline documentation in [include/uapi]<linux/gpio.h>
+		for descriptions of all ioctls.
+
+		close(2)
+		Stops and free up the I/O contexts that was associated
+		with the file descriptor.
+
+Users:		TBD
diff --git a/MAINTAINERS b/MAINTAINERS
index 3bb1f52d54e0..23cd966cb974 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4642,6 +4642,7 @@ L:	linux-gpio@xxxxxxxxxxxxxxx
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git
 S:	Maintained
 F:	Documentation/gpio/
+F:	Documentation/ABI/testing/gpio-cdev
 F:	drivers/gpio/
 F:	include/linux/gpio/
 F:	include/linux/gpio.h
-- 
2.4.3

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