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

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Date:   Thu, 4 Aug 2022 09:40:44 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Rob Herring <robh@...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 Thu, Aug 04, 2022 at 07:47:35AM +0200, Johan Hovold wrote:
> On Wed, Aug 03, 2022 at 05:26:44PM -0600, Rob Herring wrote:
> > On Wed, Aug 03, 2022 at 09:31:06AM +0200, 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.)
> > 
> > 'wakeup-source' belongs wherever the interrupt that causes wakeup is 
> > defined.
> 
> Thanks for clarifying. That was my understanding as well, but I
> misinterpreted your wish to keep the 'wakeup-source' property also in
> the core node.
> 
> My thought was that if it turns out that there are systems that do not
> use a glue node but that do indeed support wakeup, then such a property
> could be added back later.
> 
> But let's keep it in the binding then.

I realise it may not have been clear that the patch I suggested to
revert was first merged for 6.0-rc1, in case that makes any difference.

But I'll drop the revert unless I hear otherwise.

Johan