Re: [PATCH 1/2] dt-bindings: drm/bridge: Add no-hpd property

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On 21/03/23 18:08, Krzysztof Kozlowski wrote:
On 21/03/2023 13:02, Jayesh Choudhary wrote:

+    type: boolean
+    description:
+      Set if the HPD line on the bridge isn't hooked up to anything or is
+      otherwise unusable.

It's the property of the panel, not bridge. Unless you want to say that
bridge physically does not have HPD? Does it follow the standard in such
case?

MHDP does have hpd. But the mhdp driver should handle the cases when the

This is about bindings, not driver. Your driver can still handle this as
it wishes.

hpd pin of bridge is not connected to that of the DP-connector. This is
to add support for that. (optional property)

Which is indicated by panel no-hpd, right?

Actually no panel is involved in this. For TI SoC J721S2, the data pipeline involves the bridge whose endpoint is directly the DP connector with compatible 'dp-connector'. And in the binding dp-connector.yaml, there isn't any 'no-hpd' property for this indication.

Does this clarifies the issue? Or did I misinterpret your comment?

Or you mean now that HPD
physically cannot go to panel because it is cut on the bridge side? But
isn't this the same case (from hardware/bindings point, not driver) as
panel would not have HPD?
Warm Regards,
-Jayesh



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