v4.19.13 snapshot.
diff --git a/Documentation/ABI/testing/sysfs-class-led-trigger-usbport b/Documentation/ABI/testing/sysfs-class-led-trigger-usbport
new file mode 100644
index 0000000..f440e69
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-trigger-usbport
@@ -0,0 +1,12 @@
+What: /sys/class/leds/<led>/ports/<port>
+Date: September 2016
+KernelVersion: 4.9
+Contact: linux-leds@vger.kernel.org
+ linux-usb@vger.kernel.org
+Description:
+ Every dir entry represents a single USB port that can be
+ selected for the USB port trigger. Selecting ports makes trigger
+ observing them for any connected devices and lighting on LED if
+ there are any.
+ Echoing "1" value selects USB port. Echoing "0" unselects it.
+ Current state can be also read.