On Mon, Feb 07, 2022 at 06:04:51PM +0200, Laurent Pinchart wrote:

On Sat, Feb 05, 2022 at 07:54:25PM +0100, Paul Kocialkowski wrote:

quoted

Some Allwinner devices come with an Image Signal Processor (ISP) that
allows processing camera data to produce good-looking images,
especially from raw bayer representations.

The ISP does not have a dedicated capture path: it is fed directly by
one of the CSI controllers, which can be selected at run-time.

Represent this possibility as a graph connection between the CSI
controller and the ISP in the device-tree bindings.

Signed-off-by: Paul Kocialkowski <redacted>
---
 .../bindings/media/allwinner,sun6i-a31-csi.yaml    | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
index 3cc61866ea89..7952413f98d8 100644
--- a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
+++ b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml

@@ -83,6 +83,20 @@ properties:
 
         additionalProperties: false
 
+      port@2:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        description: ISP output port
+
+        properties:
+          reg:
+            const: 2
+
+          endpoint:
+            $ref: video-interfaces.yaml#
+            unevaluatedProperties: false

This could be

            $ref: video-interfaces.yaml#
            remote-endpoint: true
            additionalProperties: false

to reject other properties.

If that's what is desired, then video-interfaces.yaml shouldn't be 
referenced and up above should be /properties/port.

Rob