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| author | Andrei Kuchynski <akuchynski@chromium.org> | 2026-01-19 13:18:20 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-01-23 17:18:01 +0100 |
| commit | 027b304ca3f6989f6946b5b3bcc727cf3f54774f (patch) | |
| tree | 980fb1a0605f873a3ad8f0ffbd3cd2922313a018 /Documentation/ABI | |
| parent | 4ec128733f68f77af452b0d97d8688cd33cd963e (diff) | |
| download | linux-next-027b304ca3f6989f6946b5b3bcc727cf3f54774f.tar.gz linux-next-027b304ca3f6989f6946b5b3bcc727cf3f54774f.zip | |
usb: typec: Expose alternate mode priority via sysfs
This patch introduces a priority sysfs attribute to the USB Type-C
alternate mode port interface. This new attribute allows user-space to
configure the numeric priority of alternate modes managing their preferred
order of operation. If a new priority value conflicts with an existing
mode's priority, the priorities of the conflicting mode and all subsequent
modes are automatically incremented to ensure uniqueness.
Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260119131824.2529334-4-akuchynski@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-typec | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec index 38e101c17a00..737b76828b50 100644 --- a/Documentation/ABI/testing/sysfs-class-typec +++ b/Documentation/ABI/testing/sysfs-class-typec @@ -162,6 +162,17 @@ Description: Lists the supported USB Modes. The default USB mode that is used - usb3 (USB 3.2) - usb4 (USB4) +What: /sys/class/typec/<port>/<alt-mode>/priority +Date: July 2025 +Contact: Andrei Kuchynski <akuchynski@chromium.org> +Description: + Displays and allows setting the priority for a specific alternate mode. + The priority is an integer in the range 0-255. A lower numerical value + indicates a higher priority (0 is the highest). + If the new value is already in use by another mode, the priority of the + conflicting mode and any subsequent modes will be incremented until they + are all unique. + USB Type-C partner devices (eg. /sys/class/typec/port0-partner/) What: /sys/class/typec/<port>-partner/accessory_mode |