2 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-gpio b/Documentation/ABI/testing/sysfs-gpio
index 8aab8092ad35..80f4c94c7bef 100644
--- a/Documentation/ABI/testing/sysfs-gpio
+++ b/Documentation/ABI/testing/sysfs-gpio
@@ -19,6 +19,7 @@ Description:
         /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
+            /edge ... r/w as: none, falling, rising, both
         /gpiochipN ... for each gpiochip; #N is its first GPIO
             /base ... (r/o) same as N
             /label ... (r/o) descriptive, not necessarily unique
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt
index 566edaa56a53..fa4dc077ae0e 100644
--- 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: