linux-kernel - Re: [PATCH v1 1/3] dt-bindings: usb: dwc3: Add a property to reserve endpoints

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Message-ID: <20250123220946.GA407034-robh@kernel.org>
Date: Thu, 23 Jan 2025 16:09:46 -0600
From: Rob Herring <robh@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Ferry Toth <fntoth@...il.com>
Subject: Re: [PATCH v1 1/3] dt-bindings: usb: dwc3: Add a property to reserve
 endpoints

On Thu, Jan 16, 2025 at 05:40:46PM +0200, Andy Shevchenko wrote:
> Some of the endpoints may be reserved by hardware for different purposes,
> e.g., tracing control and output. This is the case, for instance, on
> Intel Merrifield and Moorefield platforms that reserve a few and USB driver
> may not use them for the regular transfers. Add the respective bindings.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.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 1cd0ca90127d..2ae8e5e85f78 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -109,6 +109,16 @@ properties:
>    resets:
>      minItems: 1
>  
> +  snps,reserved-endpoints:
> +    description:
> +      Reserve endpoints for other needs, e.g, for tracing control and output.
> +      When set, the driver will avoid using them for the regular USB transfers.
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    maxItems: 30

Please make minItems explicit.

> +    items:
> +      minimum: 2
> +      maximum: 31
> +
>    snps,usb2-lpm-disable:
>      description: Indicate if we don't want to enable USB2 HW LPM for host
>        mode.
> -- 
> 2.43.0.rc1.1336.g36b5255a03ac
>