linux-kernel - Re: [PATCH v2 7/9] dt-bindings: usb: qcom,dwc3: add wakeup-source property

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Message-ID: <Yu6ZwePzzkl7tewV@hovoldconsulting.com>
Date:   Sat, 6 Aug 2022 18:41:37 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...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@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v2 7/9] dt-bindings: usb: qcom,dwc3: add wakeup-source
 property

On Sat, Aug 06, 2022 at 08:38:48PM +0530, Manivannan Sadhasivam wrote:
> On Thu, Aug 04, 2022 at 05:09:59PM +0200, Johan Hovold wrote:
> > Add a wakeup-source property to the binding to describe whether the
> > wakeup interrupts can wake the system from suspend.
> > 
> > Acked-by: Rob Herring <robh@...nel.org>
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> 
> So this is based on the fact that Qcom glue wrapper is supplying the wakeup
> interrupts. But isn't it possible that on other platform, the DWC IP can supply
> wakeup interrupts?

Yeah, possibly, and that's why Rob suggested keeping the 'wakeup-source'
property also in the core node.

> In the driver, the wakeup-source parsing has been moved to the Qcom glue driver.
> But this contradicts with the binding.

That's irrelevant. The core driver does not implement wakeup support. It
was just added as a hack for the Qualcomm driver, and you won't get
wakeup-capability for other platforms by just parsing the property in
the core driver.

When/if wakeup support for such a platform is added, then the core
driver may need to look at the property again.

Johan