From: Mathias Nyman Date: Thu, 19 Apr 2018 16:05:55 +0000 (+0300) Subject: Documentation sysfs-bus-usb: Add rx_lanes and tx_lanes introduced in USB 3.2 X-Git-Tag: v4.19~894^2~117 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b462e2e0d62a716f7a1b7a7ecea966edc3de45d7;p=platform%2Fkernel%2Flinux-rpi.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb index c702c78..c6e9b30 100644 --- a/Documentation/ABI/testing/sysfs-bus-usb +++ b/Documentation/ABI/testing/sysfs-bus-usb @@ -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 +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 +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)