[PATCH 1/3] dt-bindings: connector: usb: add altmodes description

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

Add description of the USB-C AltModes supported on the particular USB-C
connector. This is required for devices like Qualcomm Robotics RB5,
which have no other way to express alternative modes supported by the
hardware platform.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 .../bindings/connector/usb-connector.yaml     | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
index 7c8a3e8430d3..9922622abf51 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
+++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
@@ -14,6 +14,30 @@ description:
   of a USB interface controller or a separate node when it is attached to both
   MUX and USB interface controller.
 
+$defs:
+  altmode-desc:
+    type: object
+    description:
+      A single USB-C Alternative Mode as supported by the USB-C connector logic.
+    properties:
+      svid:
+        $ref: /schemas/types.yaml#/definitions/uint16
+        description: Unique value assigned by USB-IF to the Vendor / AltMode.
+      vdo:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: VDO returned by Discover Modes USB PD command.
+
+  altmodes-list:
+    descrption: List of Alternative Modes supported by the schematics on the
+      particular device. This is only necessary if there are no other means to
+      discover supported alternative modes (e.g. through the UCSI firmware
+      interface).
+
+    patternProperties:
+      "^[a-z][a-z0-9]*$":
+        $ref: "#/$defs/altmode-desc"
+        unevaluatedProperties: false
+
 properties:
   compatible:
     oneOf:
@@ -171,6 +195,10 @@ properties:
       offer the power, Capability Mismatch is set. Required for power sink and
       power dual role.
 
+  altmodes:
+    $ref: "#/$defs/altmodes-list"
+    unevaluatedProperties: false
+
   port:
     $ref: /schemas/graph.yaml#/properties/port
     description: OF graph bindings modeling a data bus to the connector, e.g.
@@ -289,6 +317,13 @@ examples:
             compatible = "usb-c-connector";
             label = "USB-C";
 
+            altmodes {
+                displayport {
+                    svid = /bits/ 16 <0xff01>;
+                    vdo = <0x00001c46>;
+                };
+            };
+
             ports {
                 #address-cells = <1>;
                 #size-cells = <0>;
-- 
2.42.0