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>
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@ -236,3 +236,21 @@ Description:
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Supported values are 0 - 15.
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More information on how besl values map to microseconds can be found in
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USB 2.0 ECN Errata for Link Power Management, section 4.10)
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What: /sys/bus/usb/devices/.../rx_lanes
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Date: March 2018
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Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
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Description:
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Number of rx lanes the device is using.
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USB 3.2 adds Dual-lane support, 2 rx and 2 tx lanes over Type-C.
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Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
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direction. Devices before USB 3.2 are single lane (rx_lanes = 1)
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What: /sys/bus/usb/devices/.../tx_lanes
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Date: March 2018
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Contact: Mathias Nyman <mathias.nyman@linux.intel.com>
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Description:
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Number of tx lanes the device is using.
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USB 3.2 adds Dual-lane support, 2 rx and 2 tx -lanes over Type-C.
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Inter-Chip SSIC devices support asymmetric lanes up to 4 lanes per
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direction. Devices before USB 3.2 are single lane (tx_lanes = 1)
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