Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / Documentation / ABI / testing / sysfs-bus-usb

diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index 294aa86..e647378 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -142,3 +142,18 @@ Description:
                such devices.
 Users:
                usb_modeswitch
+
+What:          /sys/bus/usb/devices/.../power/usb2_hardware_lpm
+Date:          September 2011
+Contact:       Andiry Xu <andiry.xu@amd.com>
+Description:
+               If CONFIG_USB_SUSPEND is set and a USB 2.0 lpm-capable device
+               is plugged in to a xHCI host which support link PM, it will
+               perform a LPM test; if the test is passed and host supports
+               USB2 hardware LPM (xHCI 1.0 feature), USB2 hardware LPM will
+               be enabled for the device and the USB device directory will
+               contain a file named power/usb2_hardware_lpm.  The file holds
+               a string value (enable or disable) indicating whether or not
+               USB2 hardware LPM is enabled for the device. Developer can
+               write y/Y/1 or n/N/0 to the file to enable/disable the
+               feature.