Re: [PATCH v6 6/7] dt/bindings: drm/bridge: it6505: Add mode-switch support

[Krzysztof Kozlowski]

On 24/11/2022 11:20, 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@xxxxxxxxxxxx>
> 
> ---
> 
> Changes in v6:
> - Remove switches node and use endpoints and data-lanes property to
>   describe the connections.
> 
>  .../bindings/display/bridge/ite,it6505.yaml   | 94 ++++++++++++++++++-
>  1 file changed, 90 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index 833d11b2303a..b4b9881c7759 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -52,9 +52,53 @@ properties:
>      maxItems: 1
>      description: extcon specifier for the Power Delivery
>  
> -  port:
> -    $ref: /schemas/graph.yaml#/properties/port
> -    description: A port node pointing to DPI host port node
> +  data-lanes:
> +    maxItems: 1
> +    description: restrict the dp output data-lanes with value of 1-4

Hm, where is the definition of this type? For example it comes with
video-interfaces, which you did not reference here.

> +
> +  max-pixel-clock-khz:

There is no such unit accepted:
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml

> +    maxItems: 1

maxItems of what type? What is this?

> +    description: restrict max pixel clock
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports

This is incompatible change... how do you handle now ABI break?

> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/$defs/port-base

Why changing the ref?

> +        unevaluatedProperties: false
> +        description: A port node pointing to DPI host port node
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port-base
> +        description:
> +          Video port for panel or connector.
> +
> +        patternProperties:
> +          "^endpoint@[01]$":
> +            $ref: /schemas/media/video-interfaces.yaml#
> +            type: object
> +            unevaluatedProperties: false
> +
> +            properties:
> +              reg:
> +                maxItems: 1
> +
> +              remote-endpoint: true
> +
> +              data-lanes:
> +                minItems: 1
> +                uniqueItems: true
> +                items:
> +                  - enum: [ 0, 1, 2, 3]

Same problem as your previouspatch.

> +
> +              mode-switch:
> +                type: boolean
> +                description: Register this node as a Type-C mode switch or not.
> +
> +	    required:
> +        - reg
> +	      - remote-endpoint
>  
>  required:
>    - compatible
> @@ -62,7 +106,7 @@ required:
>    - pwr18-supply
>    - interrupts
>    - reset-gpios
> -  - extcon
> +  - ports
>  
>  additionalProperties: false
>  
> @@ -92,3 +136,45 @@ examples:
>              };
>          };
>      };
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    &i2c3 {
> +        clock-frequency = <100000>;
> +
> +        it6505dptx: it6505dptx@5c {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +            compatible = "ite,it6505";
> +            interrupts = <8 IRQ_TYPE_LEVEL_LOW 8 0>;
> +            reg = <0x5c>;
> +            pinctrl-names = "default";
> +            pinctrl-0 = <&it6505_pins>;
> +            ovdd-supply = <&mt6366_vsim2_reg>;
> +            pwr18-supply = <&pp1800_dpbrdg_dx>;
> +            reset-gpios = <&pio 177 0>;
> +            hpd-gpios = <&pio 10 0>;
> +
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                port@0 {
> +                    reg = <0>;
> +                    it6505_in: endpoint {
> +                        remote-endpoint = <&dpi_out>;
> +                    };
> +                };
> +                port@1 {
> +                    reg = <1>;
> +                    ite_typec0: endpoint@0 {
> +                        mode-switch;
> +                        data-lanes = <0 1>;

Does not look like you tested the bindings. Please run `make
dt_binding_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).

Best regards,
Krzysztof