Claude review: dt-bindings: display: tegra: document Tegra20 HDMI port

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

The binding change adds a `port` property and restructures the required properties to allow either the legacy approach or the OF graph approach.

> +  port:
> +    description: HDMI output port for connection to HDMI connector or bridge
> +    $ref: /schemas/graph.yaml#/properties/port

This is a clean addition. The reference to the graph port schema is correct, and since the existing binding has `additionalProperties: false`, the property must be listed here to be allowed.

> -  - nvidia,ddc-i2c-bus
> -  - nvidia,hpd-gpio
> +
> +anyOf:
> +  - required:
> +      - nvidia,ddc-i2c-bus
> +      - nvidia,hpd-gpio
> +  - required:
> +      - port

The `anyOf` logic is correct: at least one of the two groups must be satisfied. This preserves backward compatibility with existing DTS files that use the legacy properties. One thing to note is that `anyOf` also permits a node to have all three properties simultaneously (`nvidia,ddc-i2c-bus`, `nvidia,hpd-gpio`, and `port`). That may or may not be intentional -- if the driver doesn't handle having both the legacy properties and a port simultaneously, it might be worth considering `oneOf` instead. But this is a design choice rather than a bug, and having both present wouldn't violate the schema.

The commit message is accurate but brief. No other issues.

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