linux-kernel - Re: [PATCH] dt-bindings: usb: dwc3: Add usb-psy-name string

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Date:   Tue, 30 Mar 2021 10:11:29 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ray Chi <raychi@...gle.com>
Cc:     gregkh@...uxfoundation.org, balbi@...nel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kyletso@...gle.com, badhri@...gle.com
Subject: Re: [PATCH] dt-bindings: usb: dwc3: Add usb-psy-name string

On Sun, Mar 28, 2021 at 03:15:20AM +0800, Ray Chi wrote:
> This commit adds documentation for usb-psy-name string.
> The string will use to find the power supply interface.
> And then, DWC3 can use the interface to control charing
> current with USB state and USB speed.

Why is this DWC3 specific?

Where does it find the power supply interface?

> 
> Signed-off-by: Ray Chi <raychi@...gle.com>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index 2247da77eac1..ad62f4552fad 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -301,6 +301,13 @@ properties:
>      items:
>        enum: [1, 4, 8, 16, 32, 64, 128, 256]
>  
> +  usb-psy-name:
> +    description:
> +      Contains the name for power supply interface. To follow
> +      BC1.2 specification, DWC3 could use power supply interface
> +      to control current with corresponding USB state and USB speed.
> +    minItems: 1
> +
>  unevaluatedProperties: false
>  
>  required:
> -- 
> 2.31.0.291.g576ba9dcdaf-goog
>