diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-usb | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb index 6df4e6f57560..5f75f8f7df34 100644 --- a/Documentation/ABI/testing/sysfs-bus-usb +++ b/Documentation/ABI/testing/sysfs-bus-usb | |||
| @@ -208,3 +208,15 @@ Description: | |||
| 208 | such as ACPI. This file will read either "removable" or | 208 | such as ACPI. This file will read either "removable" or |
| 209 | "fixed" if the information is available, and "unknown" | 209 | "fixed" if the information is available, and "unknown" |
| 210 | otherwise. | 210 | otherwise. |
| 211 | |||
| 212 | What: /sys/bus/usb/devices/.../ltm_capable | ||
| 213 | Date: July 2012 | ||
| 214 | Contact: Sarah Sharp <sarah.a.sharp@linux.intel.com> | ||
| 215 | Description: | ||
| 216 | USB 3.0 devices may optionally support Latency Tolerance | ||
| 217 | Messaging (LTM). They indicate their support by setting a bit | ||
| 218 | in the bmAttributes field of their SuperSpeed BOS descriptors. | ||
| 219 | If that bit is set for the device, ltm_capable will read "yes". | ||
| 220 | If the device doesn't support LTM, the file will read "no". | ||
| 221 | The file will be present for all speeds of USB devices, and will | ||
| 222 | always read "no" for USB 1.1 and USB 2.0 devices. | ||