Documentation: iio-trig-sysfs: Document add_trigger attribute

This patch adds the ABI documentation for the add_trigger
attribute, which is provided by the iio-trig-sysfs stand-alone driver.

Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-trigger-sysfs b/Documentation/ABI/testing/sysfs-bus-iio-trigger-sysfs
index bbb039237a2580307d614030ea5013b71f749f6f..76698d2f0eea0e389fcbb613c9e0468d7bdad46d 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio-trigger-sysfs
+++ b/Documentation/ABI/testing/sysfs-bus-iio-trigger-sysfs
@@ -18,3 +18,14 @@ Description:
                trigger. In order to associate the trigger with an IIO device
                one should write this name string to
                /sys/bus/iio/devices/iio:deviceY/trigger/current_trigger.
+
+What:          /sys/bus/iio/devices/iio_sysfs_trigger/add_trigger
+KernelVersion: 2.6.39
+Contact:       linux-iio@vger.kernel.org
+Description:
+               This attribute is provided by the iio-trig-sysfs stand-alone
+               driver and it is used to activate the creation of a new trigger.
+               In order to achieve this, one should write a positive integer
+               into the associated file, which will serve as the id of the
+               trigger. If the trigger with the specified id is already present
+               in the system, an invalid argument message will be returned.