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| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2024-10-16 15:18:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-17 08:41:45 +0200 |
| commit | 2140a952c4e9c73993ae6d9c2cc674d263d4beab (patch) | |
| tree | 867b229913281cd95c8e6cf8b654b31628449c4a /Documentation/ABI | |
| parent | usb: typec: Add attribute file showing the supported USB modes of the port (diff) | |
| download | linux-2140a952c4e9c73993ae6d9c2cc674d263d4beab.tar.xz linux-2140a952c4e9c73993ae6d9c2cc674d263d4beab.zip | |
usb: typec: Add attribute file showing the USB Modes of the partner
This attribute file shows the supported USB modes (USB 2.0,
USB 3.0 and USB4) of the partner, and the currently active
mode.
The active mode is determined primarily by checking the
speed of the enumerated USB device. When USB Power Delivery
is supported, the active USB mode should be always the mode
that was used with the Enter_USB Message, regardless of the
result of the USB enumeration. The port drivers can
separately assign the mode with a dedicated API.
If USB Power Delivery Identity is supplied for the partner
device, the supported modes are extracted from it.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20241016131834.898599-3-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-typec | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec index 3ee757208122..38e101c17a00 100644 --- a/Documentation/ABI/testing/sysfs-class-typec +++ b/Documentation/ABI/testing/sysfs-class-typec @@ -233,6 +233,20 @@ Description: directory exists, it will have an attribute file for every VDO in Discover Identity command result. +What: /sys/class/typec/<port>-partner/usb_mode +Date: November 2024 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: The USB Modes that the partner device supports. The active mode + is displayed in brackets. The active USB mode can be changed by + writing to this file when the port driver is able to send Data + Reset Message to the partner. That requires USB Power Delivery + contract between the partner and the port. + + Valid values: + - usb2 (USB 2.0) + - usb3 (USB 3.2) + - usb4 (USB4) + USB Type-C cable devices (eg. /sys/class/typec/port0-cable/) Note: Electronically Marked Cables will have a device also for one cable plug |