linux-kernel - Re: [PATCH RESEND 2/2] dt-bindings: usb: add no-64-bit-support property

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Date:   Mon, 6 Nov 2023 08:44:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Naveen Kumar <mnkumar@...gle.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, royluo@...gle.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH RESEND 2/2] dt-bindings: usb: add no-64-bit-support
 property

On Wed, Nov 01, 2023 at 10:16:25AM +0000, Naveen Kumar wrote:
> From: Naveen Kumar M <mnkumar@...gle.com>
> 
> Add a new DT option to specify whether a host controller is able to
> support 64-bit DMA memory pointers
> 
> Signed-off-by: Naveen Kumar M <mnkumar@...gle.com>
> ---
>  Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> index 180a261c3e8f..20dc134004f3 100644
> --- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> @@ -25,6 +25,10 @@ properties:
>      description: Set if the controller has broken port disable mechanism
>      type: boolean
>  
> +  quirk-no-64-bit-support:
> +    description: Set if the xHC doesn't support 64-bit DMA memory pointers
> +    type: boolean

To add on to this, you can handle this with dma-ranges if you need to 
limit DMA addresses to less than 32-bits.

Rob