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SubjectRe: [PATCH v3 11/28] dt-bindings: usb: dwc3: Add snps,num-hc-interrupters definition
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Hi Rob,

On 3/11/2023 5:40 AM, Rob Herring wrote:
> On Wed, Mar 08, 2023 at 03:57:34PM -0800, 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@quicinc.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 be36956af53b..4e2417191f93 100644
>> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>> @@ -359,6 +359,19 @@ 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.
>
> Is this an XHCI or DWC3 feature? The former should be added to the XHCI
> binding.
>

Sorry for the late response...message got routed to a folder I don't
frequently check...

This is a XHCI feature, but the DWC3 design is built in a way that DWC3
host initializes the XHCI device and populates the properties associated
to XHCI dev.

Will update the XHCI yaml as well for non-DWC3 based SoCs.

Thanks
Wesley Cheng

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