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Documentation sysfs-bus-usb: Add rx_lanes and tx_lanes introduced in USB 3.2 

rx_lanes and tx_lanes sysfs entries show the number of lanes in use by a
device.
USB 3.2 adds support for Dual-lane (symmetrical), using 2 rx lanes and
2 tx lanes for normal non Inter-Chip SSIC devices.
USB 3.1 and older are all single lane.

SSIC devices can have up to 4 lanes per direction in use,
with different number of rx and tx lanes.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2018-04-19 19:05:55 +03:00 committed by Greg Kroah-Hartman
parent 460fd21618
commit b462e2e0d6
1 changed files with 18 additions and 0 deletions
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18
Documentation/ABI/testing/sysfs-bus-usb
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@ -236,3 +236,21 @@ Description:
Supported values are 0 - 15.
More information on how besl values map to microseconds can be found in
USB 2.0 ECN Errata for Link Power Management, section 4.10)
What: /sys/bus/usb/devices/.../rx_lanes
Date: March 2018
Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
Description:
Number of rx lanes the device is using.
USB 3.2 adds Dual-lane support, 2 rx and 2 tx lanes over Type-C.
Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
direction. Devices before USB 3.2 are single lane (rx_lanes = 1)
What: /sys/bus/usb/devices/.../tx_lanes
Date: March 2018
Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
Description:
Number of tx lanes the device is using.
USB 3.2 adds Dual-lane support, 2 rx and 2 tx -lanes over Type-C.
Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
direction. Devices before USB 3.2 are single lane (tx_lanes = 1)