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:   Tue, 16 Nov 2021 16:11:30 +0530
From:   Sandeep Maheswaram <quic_c_sanm@...cinc.com>
To:     Rob Herring <robh@...nel.org>
CC:     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


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.

>> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
>> ---
>>   Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
>> index 965f87f..a64d29f 100644
>> --- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml
>> +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
>> @@ -25,6 +25,10 @@ properties:
>>       description: Set if the controller has broken port disable mechanism
>>       type: boolean
>>   
>> +  usb-skip-phy-init:
>> +    description: Set if the phy initialization is managed by controller
>> +    type: boolean
>> +
>>     imod-interval-ns:
>>       description: Interrupt moderation interval
>>       default: 5000
>> -- 
>> 2.7.4
>>
>>