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-rw-r--r--Documentation/ABI/testing/sysfs-bus-usb14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index e5cc7633d013..864637f25bee 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -114,6 +114,20 @@ Description:
enabled for the device. Developer can write y/Y/1 or n/N/0 to
the file to enable/disable the feature.
+What: /sys/bus/usb/devices/.../power/usb3_hardware_lpm
+Date: June 2015
+Contact: Kevin Strasser <kevin.strasser@linux.intel.com>
+Description:
+ If CONFIG_PM is set and a USB 3.0 lpm-capable device is plugged
+ in to a xHCI host which supports link PM, it will check if U1
+ and U2 exit latencies have been set in the BOS descriptor; if
+ the check is is passed and the host supports USB3 hardware LPM,
+ USB3 hardware LPM will be enabled for the device and the USB
+ device directory will contain a file named
+ power/usb3_hardware_lpm. The file holds a string value (enable
+ or disable) indicating whether or not USB3 hardware LPM is
+ enabled for the device.
+
What: /sys/bus/usb/devices/.../removable
Date: February 2012
Contact: Matthew Garrett <mjg@redhat.com>