linux-kernel - Re: [PATCH RFC 01/22] dt-bindings: usb: snps,dwc3: Allow multiple iommus

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Message-ID: <20250822-skinny-clay-harrier-64dc58@kuoka>
Date: Fri, 22 Aug 2025 09:22:00 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sven Peter <sven@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Felipe Balbi <balbi@...nel.org>, Janne Grunau <j@...nau.net>, 
	Alyssa Rosenzweig <alyssa@...enzweig.io>, Neal Gompa <neal@...pa.dev>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Thinh Nguyen <Thinh.Nguyen@...opsys.com>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-phy@...ts.infradead.org
Subject: Re: [PATCH RFC 01/22] dt-bindings: usb: snps,dwc3: Allow multiple
 iommus

On Thu, Aug 21, 2025 at 03:38:53PM +0000, Sven Peter wrote:
> Apple's dwc3 variant requires two iommus.
> 
> Signed-off-by: Sven Peter <sven@...nel.org>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index 4380bb6fa2f08a475b557e80467abc2861f622e2..6d35dcc605c01977f4fc6fdb6f12976f1cef2b9e 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -60,7 +60,7 @@ properties:
>    dma-coherent: true
>  
>    iommus:
> -    maxItems: 1
> +    maxItems: 2

Never tested. You anyway need specific constraints.

>  
>    power-domains:
>      description:
> 
> -- 
> 2.34.1
> 
>