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Message-ID: <20230726171934.GA1654540-robh@kernel.org>
Date: Wed, 26 Jul 2023 11:19:34 -0600
From: Rob Herring <robh@...nel.org>
To: Wesley Cheng <quic_wcheng@...cinc.com>
Cc: agross@...nel.org, andersson@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
catalin.marinas@....com, will@...nel.org, mathias.nyman@...el.com,
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broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
srinivas.kandagatla@...aro.org, bgoswami@...cinc.com,
Thinh.Nguyen@...opsys.com, 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,
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Subject: Re: [PATCH v4 13/32] dt-bindings: usb: dwc3: Add
snps,num-hc-interrupters definition
On Mon, Jul 24, 2023 at 07:33:57PM -0700, 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.
Why does this belong in DT? What 'uses' determines the value? Who wants
to change this and when?
>
> 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
> + minimum: 1
> + maximum: 8
> + default: 1
> +
> port:
> $ref: /schemas/graph.yaml#/properties/port
> description:
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