linux-kernel - Re: [PATCH V4 2/6] bindings: usb: dwc3: Update dwc3 properties for EUD connector

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Message-ID: <YfDMQIFiCfzQy91y@builder.lan>
Date:   Tue, 25 Jan 2022 22:21:20 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, pure.logic@...us-software.ie,
        greg@...ah.com, robh@...nel.org, linux-kernel@...r.kernel.org,
        quic_tsoni@...cinc.com, quic_psodagud@...cinc.com,
        quic_satyap@...cinc.com, quic_pheragu@...cinc.com,
        quic_rjendra@...cinc.com, quic_sibis@...cinc.com,
        quic_saipraka@...cinc.com
Subject: Re: [PATCH V4 2/6] bindings: usb: dwc3: Update dwc3 properties for
 EUD connector

On Fri 21 Jan 07:53 CST 2022, Souradeep Chowdhury wrote:

> Add the ports property for dwc3 node. This port can be used
> by the Embedded USB Debugger for role switching the controller
> from device to host mode and vice versa.
> 
> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index d29ffcd..ccb1236 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -332,6 +332,16 @@ properties:
>      items:
>        enum: [1, 4, 8, 16, 32, 64, 128, 256]
>  
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    description:
> +      This port is to be attached to the endpoint of the Embedded USB Debugger.

More generally this is used together with the already documented
usb-role-switch property to connect the dwc3 to the Type-C connector.

Which makes me feel that we don't actually need ports/port, but could do
with just port? Perhaps I'm missing some usecase?


I'm somewhat confused to why this isn't already documented...

Regards,
Bjorn

> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Connector endpoint of Embedded USB debugger.
> +
>  unevaluatedProperties: false
>  
>  required:
> -- 
> 2.7.4
>