linux-kernel - Re: [PATCH V2] dt-bindings: usb: dwc3: Add interrupt-names property support for wakeup interrupt

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Message-ID: <76dfbf27-8ad2-6e09-5354-b006b9e81af1@linaro.org>
Date:   Fri, 12 May 2023 09:03:20 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Mehta, Piyush" <piyush.mehta@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>
Cc:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Simek, Michal" <michal.simek@....com>,
        "Paladugu, Siva Durga Prasad" <siva.durga.prasad.paladugu@....com>,
        "git (AMD-Xilinx)" <git@....com>
Subject: Re: [PATCH V2] dt-bindings: usb: dwc3: Add interrupt-names property
 support for wakeup interrupt

On 12/05/2023 08:57, Mehta, Piyush wrote:
> Hi,
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> Sent: Thursday, May 11, 2023 3:05 PM
>> To: Mehta, Piyush <piyush.mehta@....com>; gregkh@...uxfoundation.org;
>> robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
>> conor+dt@...nel.org; balbi@...nel.org; michal.simek@...inx.com
>> Cc: linux-usb@...r.kernel.org; devicetree@...r.kernel.org; linux-
>> kernel@...r.kernel.org; Simek, Michal <michal.simek@....com>; Paladugu,
>> Siva Durga Prasad <siva.durga.prasad.paladugu@....com>; git (AMD-Xilinx)
>> <git@....com>
>> Subject: Re: [PATCH V2] dt-bindings: usb: dwc3: Add interrupt-names property
>> support for wakeup interrupt
>>
>> On 11/05/2023 09:21, Piyush Mehta wrote:
>>> The hibernation feature enabled for Xilinx Versal NET SoC in DWC3 IP.
>>> As the DWC3 IP supports the hibernation feature, to handle the wakeup
>>> or hibernation interrupt, add host mode "wakeup" interrupt-names
>>> optional property in the binding schema to capture remote-wakeup and
>>> connect/ disconnect event in the hibernation state.
>>>
>>> Signed-off-by: Piyush Mehta <piyush.mehta@....com>
>>> ---
>>> Change in V2:
>>> -  Addressed ROB review comments
>>>  - Updated name of interrupt-names property with "wakeup"
>>>  - Move interrupt-names property from dwc3-xilinx core to dwc3 core.
>>>
>>> Link:
>>>
>> https://lore.kernel.org/all/CAL_JsqK6_7XD7+w+EQvPPmbmSOpfo3JDb0xDN4St
>> u
>>> HUm1kgchw@...l.gmail.com/
>>> ---
>>>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>>> b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>>> index 50edc4da780e..db512769bd80 100644
>>> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>>> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>>> @@ -53,6 +53,8 @@ properties:
>>>        - const: dwc_usb3
>>>        - items:
>>>            enum: [host, peripheral, otg]
>>> +      - items:
>>> +          enum: [dwc_usb3, otg, wakeup]
>>
>> You didn't add only "wakeup" but also dwc_usb3 which does not look correct
>> here as it is common interrupt. The change does not match commit msg and I
>> don't know what you actually want to achieve.
>>
> 
> We have dedicated irq line for hibernation feature,  "wakeup" irq line triggers hibernation interrupt and the system wakes up.
> DWC3 core supports the hibernation feature, we have a dedicated code which is yet to be upstreamed.
> As the hibernation feature provided by dwc3-core, so this will be supported by other SOC/vendors.
> 
> For this, we need the interrupt-name/ interrupt property. To enable the hibernation feature for
> Xilinx Versal NET SoC, the interrupt-name enum would be:
> - enum [host, peripheral, otg, wakeup]

Yes, this makes sense. Other combination could be dwc_usb3 and wakeup
but only if it is real... adding random entries sounds like not really.

Best regards,
Krzysztof