Document the optional port node, which is required for correctly modeling
a dual-mode panel.

Signed-off-by: Svyatoslav Ryhel <[email protected]>
---
 .../bindings/display/tegra/nvidia,tegra20-dsi.yaml          | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git 
a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dsi.yaml 
b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dsi.yaml
index 59e1dc0813e7..0f4837648d17 100644
--- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dsi.yaml
+++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dsi.yaml
@@ -83,6 +83,12 @@ properties:
       gang up with in order to support up to 8 data lanes
     $ref: /schemas/types.yaml#/definitions/phandle
 
+  port:
+    description: specifies the connection port for the dual-mode panel
+      and is required only when the panel is operating in dual-mode
+      configuration.
+    $ref: /schemas/graph.yaml#/properties/port
+
 allOf:
   - $ref: ../dsi-controller.yaml#
   - if:
-- 
2.51.0

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