Re: [PATCH v15 08/10] dt-bindings: display: bridge: it6505: Add mode-switch support

[Rob Herring <robh@kernel.org>]

On Fri, Mar 31, 2023 at 05:11:43PM +0800, Pin-yen Lin wrote:
> ITE IT6505 can be used in systems to switch the DP traffic between
> two downstreams, which can be USB Type-C DisplayPort alternate mode
> lane or regular DisplayPort output ports.
> 
> Update the binding to accommodate this usage by introducing a
> data-lanes and a mode-switch property on endpoints.
> 
> Signed-off-by: Pin-yen Lin <treapking@chromium.org>
> 
> ---
> 
> (no changes since v12)
> 
> Changes in v12:
> - Fixed the schema of "data-lanes" property for it6505
> - Reworded the description of the mode-switch property
> 
> Changes in v11:
> - Updated the description of the endpoints in the bindings
> - Referenced video-interfaces.yaml instead for the endpoints binding
> - Removed duplicated definitions from inherited schema
> 
> Changes in v9:
> - Fixed subject prefix again
> - Changed the naming of the example node for it6505
> 
> Changes in v8:
> - Updated bindings for data-lanes property
> - Fixed subject prefix
> 
> Changes in v7:
> - Fixed issues reported by dt_binding_check.
> - Updated the schema and the example dts for data-lanes.
> - Changed to generic naming for the example dts node.
> 
> Changes in v6:
> - Remove switches node and use endpoints and data-lanes property to
>   describe the connections.
> 
>  .../bindings/display/bridge/ite,it6505.yaml   | 101 +++++++++++++++---
>  1 file changed, 88 insertions(+), 13 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index c9a882ee6d98..348b02f26041 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -75,22 +75,49 @@ properties:
>        port@1:
>          $ref: /schemas/graph.yaml#/$defs/port-base
>          unevaluatedProperties: false
> -        description: Video port for DP output
> +        description:
> +          Video port for DP output. Each endpoint connects to a video output
> +          downstream, and the "data-lanes" property is used to describe the pin
> +          connections. 0, 1, 2, 3 in "data-lanes" maps to TX0, TX1, TX2, TX3,
> +          respectively.
>  
> -        properties:
> -          endpoint:
> -            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> +
> +        patternProperties:
> +          "^endpoint@[01]$":
> +            $ref: /schemas/media/video-interfaces.yaml#
>              unevaluatedProperties: false
>  
>              properties:
> +              reg: true
> +
> +              remote-endpoint: true

You don't need to list these 2.

> +
>                data-lanes:
> -                minItems: 1
> -                uniqueItems: true
> -                items:
> -                  - enum: [ 0, 1 ]
> -                  - const: 1
> -                  - const: 2
> -                  - const: 3
> +                oneOf:
> +                  - items:
> +                      - enum: [0, 3]

Only lane 1 wasn't valid? If so, mention that in the commit message.

> +
> +                  - items:
> +                      - const: 0
> +                      - const: 1
> +
> +                  - items:
> +                      - const: 3
> +                      - const: 2
> +
> +                  - items:
> +                      - const: 0
> +                      - const: 1
> +                      - const: 2
> +                      - const: 3

Isn't this the default if 'data-lanes' is omitted.

> +
> +              mode-switch:
> +                type: boolean
> +                description: Serves as Type-C mode switch if present.
> +
> +            required:
> +              - reg
> +              - remote-endpoint

required can be dropped.

>  
>      required:
>        - port@0
> @@ -102,7 +129,6 @@ required:
>    - pwr18-supply
>    - interrupts
>    - reset-gpios
> -  - extcon
>    - ports
>  
>  additionalProperties: false
> @@ -139,8 +165,11 @@ examples:
>                  };
>  
>                  port@1 {
> +                    #address-cells = <1>;
> +                    #size-cells = <0>;
>                      reg = <1>;
> -                    it6505_out: endpoint {
> +                    it6505_out: endpoint@0 {
> +                        reg = <0>;
>                          remote-endpoint = <&dp_in>;
>                          data-lanes = <0 1>;
>                      };
> @@ -148,3 +177,49 @@ examples:
>              };
>          };
>      };
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c {

Why do we need a whole new example? Just extend the existing example 
with new properties/nodes.

Rob