linux-kernel - Re: [PATCH v2 1/3] dt-bindings: usb: usb-xhci: Add bindings for usb-skip-phy-init property

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Date:   Wed, 17 Nov 2021 10:57:03 +0530
From:   Pavan Kondeti <quic_pkondeti@...cinc.com>
To:     Sandeep Maheswaram <quic_c_sanm@...cinc.com>
CC:     Rob Herring <robh@...nel.org>, Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        "Matthias Kaehlcke" <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_pkondeti@...cinc.com>, <quic_ppratap@...cinc.com>
Subject: Re: [PATCH v2 1/3] dt-bindings: usb: usb-xhci: Add bindings for
 usb-skip-phy-init property

Hi Sandeep,

On Tue, Nov 16, 2021 at 04:11:30PM +0530, Sandeep Maheswaram wrote:
> 
> On 11/13/2021 4:17 AM, Rob Herring wrote:
> >On Mon, Nov 08, 2021 at 12:11:48PM +0530, Sandeep Maheswaram wrote:
> >>Adding bindings for usb-skip-phy-init property.
> >>Runtime suspend of phy drivers was failing from DWC3 driver as
> >>runtime usage value is 2 because the phy is initialized from
> >>DWC3 core and HCD core.
> >>Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> >>This property can be set to avoid phy initialization in HCD core.
> >You already know if you have a DWC3 and CDNS3 controller, so you don't
> >need more data in DT.
> 
> We don't have a device tree node for xhci platform device and create xhci
> platform device from dwc3/host.c
> 
> So we want to pass this property to check in xhci-plat.c and skip phy
> initialization.
> 

Would not the below condition from your other patch [1] work here too?

if (of_device_is_compatible(dev->parent->of_node, "snps,dwc3"))

[1] https://lore.kernel.org/linux-usb/1635753224-23975-2-git-send-email-quic_c_sanm@quicinc.com/

Thanks,
Pavan