linux-kernel - [PATCH] dt-bindings: dp-connector: describe separate DP and AUX lines

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Message-Id: <20250907-dp-conenctor-sbu-v1-1-de79c0fcd64d@oss.qualcomm.com>
Date: Sun, 07 Sep 2025 00:48:52 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: dp-connector: describe separate DP and AUX
 lines

In some cases it's reasonable to describe DP lanes and AUX signal lines
separately in the DT. One of the typical reasons is if the source of DP
signals can support either USB-C or DP connections. In such a case the
transmitter of DP signals have separate ports: one for SS lanes and
another one for SBU / AUX signals.

Instead of leaving AUX signals from the controller unconnected, add an
option to the DT schema to AUX signal lines separately from the main
link lanes.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 .../bindings/display/connector/dp-connector.yaml   | 52 +++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/connector/dp-connector.yaml b/Documentation/devicetree/bindings/display/connector/dp-connector.yaml
index 22792a79e7ce5177113f17ab472048c220dbb3c3..1f2b449dc9102c34ad015bbe7beae0d67a2df5c5 100644
--- a/Documentation/devicetree/bindings/display/connector/dp-connector.yaml
+++ b/Documentation/devicetree/bindings/display/connector/dp-connector.yaml
@@ -31,10 +31,32 @@ properties:
     $ref: /schemas/graph.yaml#/properties/port
     description: Connection to controller providing DP signals
 
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    description: OF graph representation of signales routed to DP connector
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Connection to controller providing DP signals
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Connection to controller providing AUX signals
+
+    required:
+      - port@0
+      - port@1
+
 required:
   - compatible
   - type
-  - port
+
+oneOf:
+  - required:
+      - port
+  - required:
+      - ports
 
 additionalProperties: false
 
@@ -52,4 +74,32 @@ examples:
         };
     };
 
+  - |
+    /* DP connecttor being driven by the USB+DP combo PHY */
+    connector {
+        compatible = "dp-connector";
+        label = "dp0";
+        type = "full-size";
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+
+                endpoint {
+                    remote-endpoint = <&phy_ss_out>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+
+                endpoint {
+                    remote-endpoint = <&phy_sbu_out>;
+                };
+            };
+        };
+    };
 ...

---
base-commit: 8cd53fb40a304576fa86ba985f3045d5c55b0ae3
change-id: 20250907-dp-conenctor-sbu-3ecd5023765c

Best regards,
-- 
With best wishes
Dmitry