Re: [PATCH v5 1/2] dt-bindings: display: bridge: lvds-codec: Document pixel data sampling edge select

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On 10/18/21 9:57 PM, Laurent Pinchart wrote:

Hi,

diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml b/Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml
index 1faae3e323a4..708de84ac138 100644
--- a/Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml
@@ -79,6 +79,14 @@ properties:
         - port@0
         - port@1
+ pclk-sample:
+    description:
+      Data sampling on rising or falling edge.
+    enum:
+      - 0  # Falling edge
+      - 1  # Rising edge
+    default: 0
+

Shouldn't this be moved to the endpoint, the same way data-mapping is
defined as an endpoint property ?

The strapping is a chip property, not port property, so no.

For this particular chip that's true. I'm still not convinced overall.
For some cases it could be a per-port property

Can you be more specific about "some cases" ?

, and moving it there for
lvds-codec too could allow implementing helpers to parse DT properties,
without much drawback for this particular use case as far as I can see.
It's hard to predict the future with certainty of course, so I won't
insist.

The DT bindings and the OS drivers are separate thing, we really shouldn't start bending DT bindings so that they would fit nicely with a specific OS driver model.



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