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Diffstat (limited to 'Documentation/ABI/testing/sysfs-driver-typec-displayport')
-rw-r--r-- | Documentation/ABI/testing/sysfs-driver-typec-displayport | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-typec-displayport b/Documentation/ABI/testing/sysfs-driver-typec-displayport new file mode 100644 index 000000000..231471ad0 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-typec-displayport @@ -0,0 +1,49 @@ +What: /sys/bus/typec/devices/.../displayport/configuration +Date: July 2018 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + Shows the current DisplayPort configuration for the connector. + Valid values are USB, source and sink. Source means DisplayPort + source, and sink means DisplayPort sink. + + All supported configurations are listed as space separated list + with the active one wrapped in square brackets. + + Source example: + + USB [source] sink + + The configuration can be changed by writing to the file + + Note. USB configuration does not equal to Exit Mode. It is + separate configuration defined in VESA DisplayPort Alt Mode on + USB Type-C Standard. Functionally it equals to the situation + where the mode has been exited (to exit the mode, see + Documentation/ABI/testing/sysfs-bus-typec, and use file + /sys/bus/typec/devices/.../active). + +What: /sys/bus/typec/devices/.../displayport/pin_assignment +Date: July 2018 +Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> +Description: + VESA DisplayPort Alt Mode on USB Type-C Standard defines six + different pin assignments for USB Type-C connector that are + labeled A, B, C, D, E, and F. The supported pin assignments are + listed as space separated list with the active one wrapped in + square brackets. + + Example: + + C [D] + + Pin assignment can be changed by writing to the file. It is + possible to set pin assignment before configuration has been + set, but the assignment will not be active before the + connector is actually configured. + + Note. As of VESA DisplayPort Alt Mode on USB Type-C Standard + version 1.0b, pin assignments A, B, and F are deprecated. Only + pin assignment D can now carry simultaneously one channel of + USB SuperSpeed protocol. From user perspective pin assignments C + and E are equal, where all channels on the connector are used + for carrying DisplayPort protocol (allowing higher resolutions). |