1 files changed, 18 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-devices-power b/Documentation/ABI/testing/sysfs-devices-power
index 8ffbc25376a..840f7d64d48 100644
--- a/Documentation/ABI/testing/sysfs-devices-power
+++ b/Documentation/ABI/testing/sysfs-devices-power
@@ -165,3 +165,21 @@ Description:
 
                 Not all drivers support this attribute.  If it isn't supported,
                 attempts to read or write it will yield I/O errors.
+
+What:           /sys/devices/.../power/pm_qos_latency_us
+Date:           March 2012
+Contact:        Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+                The /sys/devices/.../power/pm_qos_resume_latency_us attribute
+                contains the PM QoS resume latency limit for the given device,
+                which is the maximum allowed time it can take to resume the
+                device, after it has been suspended at run time, from a resume
+                request to the moment the device will be ready to process I/O,
+                in microseconds.  If it is equal to 0, however, this means that
+                the PM QoS resume latency may be arbitrary.
+
+                Not all drivers support this attribute.  If it isn't supported,
+                it is not present.
+
+                This attribute has no effect on system-wide suspend/resume and
+                hibernation.