linux-kernel - Re: [PATCH v4 13/32] dt-bindings: usb: dwc3: Add snps,num-hc-interrupters definition

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Date:   Tue, 29 Aug 2023 08:31:25 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Wesley Cheng <quic_wcheng@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        catalin.marinas@....com, will@...nel.org, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        srinivas.kandagatla@...aro.org, bgoswami@...cinc.com,
        Thinh.Nguyen@...opsys.com
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-usb@...r.kernel.org, alsa-devel@...a-project.org,
        quic_jackp@...cinc.com, pierre-louis.bossart@...ux.intel.com,
        oneukum@...e.com, albertccwang@...gle.com, o-takashi@...amocchi.jp
Subject: Re: [PATCH v4 13/32] dt-bindings: usb: dwc3: Add
 snps,num-hc-interrupters definition

On 25/07/2023 04:33, Wesley Cheng wrote:
> Add a new definition for specifying how many XHCI secondary interrupters
> can be allocated.  XHCI in general can potentially support up to 1024
> interrupters, which some uses may want to limit depending on how many
> users utilize the interrupters.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> ---
>  .../devicetree/bindings/usb/snps,dwc3.yaml          | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index 50edc4da780e..cc6012e922e0 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -376,6 +376,19 @@ properties:
>      items:
>        enum: [1, 4, 8, 16, 32, 64, 128, 256]
>  
> +  snps,num-hc-interrupters:
> +    description:
> +      Defines the maximum number of XHCI host controller interrupters that can
> +      be supported.  The XHCI host controller has support to allocate multiple
> +      event rings, which can be assigned to different clients/users.  The DWC3
> +      controller has a maximum of 8 interrupters.  If this is not defined then
> +      the value will be defaulted to 1.  This parameter is used only when
> +      operating in host mode.
> +    $ref: /schemas/types.yaml#/definitions/uint8

You did not respond to Rob's comments before sending this patch. :(

Best regards,
Krzysztof