net: Simplify loopback and improve batching.

[safe/jmp/linux-2.6] / Documentation / gpio.txt

diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt
index 566edaa..fa4dc07 100644 (file)
--- a/Documentation/gpio.txt
+++ b/Documentation/gpio.txt
@@ -524,6 +524,13 @@ and have the following read/write attributes:
                is configured as an output, this value may be written;
                any nonzero value is treated as high.
 
+       "edge" ... reads as either "none", "rising", "falling", or
+               "both". Write these strings to select the signal edge(s)
+               that will make poll(2) on the "value" file return.
+
+               This file exists only if the pin can be configured as an
+               interrupt generating input pin.
+
 GPIO controllers have paths like /sys/class/gpio/chipchip42/ (for the
 controller implementing GPIOs starting at #42) and have the following
 read-only attributes: