diff options
| author | Benson Leung <bleung@chromium.org> | 2021-01-28 22:14:02 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-01 15:31:34 +0100 |
| commit | f5030e252687be6e999bd52feb1f79d515b2f684 (patch) | |
| tree | dbc11ca2a1b8af2a2a9611afc6d6306f9205f5eb /Documentation/ABI/testing/sysfs-class-typec | |
| parent | 1ed8459d8f1060c87c7d66fe2d3cbbe4bc9cdd24 (diff) | |
usb: typec: Provide PD Specification Revision for cable and partner
The USB Power Delivery specification Section 6.2.1.1.5 outlines
revision backward compatibility requirements starting from Revision 3.0.
The Port, the Cable Plug, and the Port Partner may support either
revision 2 or revision 3 independently, and communication between ports,
partners, and cables of different revisions are allowed under rules
that the parties agree to communicate between each other using the
lowest common operating revision.
This may mean that Port-to-Partner operating revision comms may be
different than Port-to-CablePlug operating revision comms. For example,
it is possible for a R3.0 port to communicate with a R3.0 partner
using R3.0 messages, while the R3.0 port (in the same session) must
communicate with the R2.0 cable using R2.0 messages only.
Introduce individual revision number properties for cable
and port partner so that the port can track them independently.
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
Link: https://lore.kernel.org/r/20210129061406.2680146-3-bleung@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-typec')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-typec | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec index b61480535fdc..40122d915ae1 100644 --- a/Documentation/ABI/testing/sysfs-class-typec +++ b/Documentation/ABI/testing/sysfs-class-typec @@ -112,6 +112,19 @@ Description: - "3.0": USB Power Delivery Release 3.0 - "3.1": USB Power Delivery Release 3.1 +What: /sys/class/typec/<port>-{partner|cable}/usb_power_delivery_revision +Date: January 2021 +Contact: Benson Leung <bleung@chromium.org> +Description: + Revision number of the supported USB Power Delivery + specification of the port partner or cable, or 0.0 when USB + Power Delivery is not supported. + + Example values: + - "2.0": USB Power Delivery Release 2.0 + - "3.0": USB Power Delivery Release 3.0 + - "3.1": USB Power Delivery Release 3.1 + What: /sys/class/typec/<port>/usb_typec_revision Date: April 2017 Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> |