Documentation sysfs-bus-usb: Add rx_lanes and tx_lanes introduced in USB 3.2 (b462e2e0) · Commits · 戴 / test

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>

Documentation/ABI/testing/sysfs-bus-usb

+18 −0

Original line number	Diff line number	Diff line
		@@ -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)

Admin message