linux-kernel - Re: [PATCH 5/8] Revert "dt-bindings: usb: dwc3: Add wakeup-source property support"

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Date:   Wed, 3 Aug 2022 09:51:00 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Johan Hovold <johan@...nel.org>, Rob Herring <robh+dt@...nel.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krishna Kurapati <quic_kriskura@...cinc.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Pavankumar Kondeti <quic_pkondeti@...cinc.com>,
        quic_ppratap@...cinc.com, quic_vpulyala@...cinc.com,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/8] Revert "dt-bindings: usb: dwc3: Add wakeup-source
 property support"

On 03/08/2022 09:31, Johan Hovold wrote:
> On Tue, Aug 02, 2022 at 11:17:22AM -0600, Rob Herring wrote:
>> On Tue, Aug 2, 2022 at 9:14 AM Johan Hovold <johan+linaro@...nel.org> wrote:
> 
>>> It should also not be used to
>>> work around Linux driver implementation issues such as how to coordinate
>>> the glue and core dwc3 drivers.
>>>
>>> For the Qualcomm dwc3 controllers, it is the glue device that manages
>>> the wakeup interrupts, which may or may not be able to wake the system
>>> up from system suspend.
>>
>> While the reasoning to add this may have been for QCom, having this
>> property for other users makes sense. On some platforms, 'snps,dwc3'
>> is the only node (i.e. there's no wrapper node). So I don't think this
>> should be reverted.
> 
> Fair enough. Let's keep it in the core child node then where we can
> still retrieve from the glue parent directly.
> 
> (I assume you're not suggesting also adding 'wakeup-source' to the qcom
> glue node, which is where the actual wakeup interrupts live.)
> 
> The glue and core parts needs to work in concert even if the current
> implementation tends to make that harder than it should be.

I think it can still exist in the glue node (so your next patch),
because as you said this is the place with wakeup interrupt, so it looks
like correct hardware description. In the next patch you would need to
disallow it for the DWC node.

Best regards,
Krzysztof