linux-kernel - Re: [PATCH] dt-bindings: usb: dwc3-xilinx: Describe the reset constraint for the versal platform

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Message-ID: <20251112-bagging-diameter-4ebab1f9ed45@spud>
Date: Wed, 12 Nov 2025 19:07:51 +0000
From: Conor Dooley <conor@...nel.org>
To: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
Cc: gregkh@...uxfoundation.org, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, michal.simek@....com,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	git@....com
Subject: Re: [PATCH] dt-bindings: usb: dwc3-xilinx: Describe the reset
 constraint for the versal platform

On Wed, Nov 12, 2025 at 09:24:30PM +0530, Radhey Shyam Pandey wrote:
> AMD Versal platform USB 2.0 IP controller receives one reset input from
> the SoC controlled by the CRL.RST_USB [RESET] register so accordingly
> describe reset constraints.
> 
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> ---
>  .../devicetree/bindings/usb/dwc3-xilinx.yaml  | 43 +++++++++++++++----
>  1 file changed, 34 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml b/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml
> index 36f5c644d959..cd0cc9da242f 100644
> --- a/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml
> +++ b/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml
> @@ -50,17 +50,22 @@ properties:
>      description:
>        A list of phandles for resets listed in reset-names.
>  
> -    items:
> -      - description: USB core reset
> -      - description: USB hibernation reset
> -      - description: USB APB reset
> +    oneOf:
> +      - items:
> +          - description: USB controller reset
> +      - items:
> +          - description: USB core reset
> +          - description: USB hibernation reset
> +          - description: USB APB reset
>  
>    reset-names:
> -    items:
> -      - const: usb_crst
> -      - const: usb_hibrst
> -      - const: usb_apbrst
> -
> +    oneOf:
> +      - items:
> +          - const: usb_crst

Why do we need all this oneOf stuff if both have the same first reset?
Can't you just set minItems: 1?

> +      - items:
> +          - const: usb_crst
> +          - const: usb_hibrst
> +          - const: usb_apbrst
>    phys:
>      minItems: 1
>      maxItems: 2
> @@ -95,6 +100,26 @@ required:
>    - resets
>    - reset-names
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - xlnx,versal-dwc3
> +    then:
> +      properties:
> +        resets:
> +          maxItems: 1
> +        reset-names:
> +          maxItems: 1
> +    else:
> +      properties:
> +        resets:
> +          minItems: 3
> +        reset-names:
> +          minItems: 3
> +
>  additionalProperties: false
>  
>  examples:
> 
> base-commit: b179ce312bafcb8c68dc718e015aee79b7939ff0
> -- 
> 2.34.1
> 

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