Re: [PATCH v6 11/16] dt-bindings: usb: mediatek,mtk-xhci: Switch to ports for USB connections

[Konrad Dybcio <konradybcio@gmail.com>]

On 7/31/26 4:33 PM, Konrad Dybcio wrote:
> On 7/21/26 8:54 AM, Chen-Yu Tsai wrote:
>> This reverts commit 454a1e3cd36c113341d7b71e8e691c6e47ab4a8a.
>>
>> MediaTek's XHCI implementation supports both USB 2.0 High Speed (HS)
>> and USB 3.x Super Speed (SS). The block can also be synthesized with
>> either HS-only capability or HS+SS capability. The SSUSB controller
>> handles the device or gadget mode. Saying that SSUSB handles the HS
>> portion is wrong.
> 
> [...]
> 
>> +  ports:
>> +    $ref: /schemas/graph.yaml#/properties/ports
>> +
>> +    properties:
>> +      port@1:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +        description: Super Speed (SS) data bus if SS-capable;
>> +          otherwise High Speed (HS) data bus.
>> +
>> +      port@2:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +        description: High Speed (HS) data bus if controller is SS-capable.
> 
> FWIW this is opposite vs what the (most common) DWC3 schema defines:

(s/opposite/different to)

Konrad

> 
> 
> (also true for mediatek,mtu3 and renesas,usb3-peri)
> 
> -- Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
>   ports:
>     $ref: /schemas/graph.yaml#/properties/ports
>     description:
>       Those ports should be used with any connector to the data bus of this
>       controller using the OF graph bindings specified if the "usb-role-switch"
>       property is used.
> 
>     properties:
>       port@0:
>         $ref: /schemas/graph.yaml#/properties/port
>         description: High Speed (HS) data bus.
> 
>       port@1:
>         $ref: /schemas/graph.yaml#/properties/port
>         description: Super Speed (SS) data bus.
> 
> Konrad