gpio/ABI: document what is already the case

commit 926b663 "gpiolib: allow GPIOs to be named" added the ability to name GPIO lines by an array of names stored in the GPIO chip. This was in 2009 and has been an ABI since. Let's document it properly. Cc: Daniel Silverstone <[email protected]> Cc: Markus Pargmann <[email protected]> Cc: Johan Hovold <[email protected]> Cc: Uwe Kleine-König <[email protected]> Signed-off-by: Linus Walleij <[email protected]>
iegor · Aug 13, 2015 · 77a775b · 77a775b
1 parent 29b5357
commit 77a775b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/Documentation/ABI/testing/sysfs-gpio b/Documentation/ABI/testing/sysfs-gpio
@@ -16,7 +16,8 @@ Description:
     /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
+	/gpioN ... for each exported GPIO #N OR
+	/<LINE-NAME> ... for a properly named GPIO line
 	    /value ... always readable, writes fail for input GPIOs
 	    /direction ... r/w as: in, out (default low); write: high, low
 	    /edge ... r/w as: none, falling, rising, both