linux-kernel - RE: [PATCH] dt-bindings: usb: dwc3: xilinx: Add interrupt-names to include hibernation interrupt

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Date:   Fri, 21 Apr 2023 13:28:03 +0000
From:   "Mehta, Piyush" <piyush.mehta@....com>
To:     Rob Herring <robh@...nel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Simek, Michal" <michal.simek@....com>,
        "Paladugu, Siva Durga Prasad" <siva.durga.prasad.paladugu@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "git (AMD-Xilinx)" <git@....com>
Subject: RE: [PATCH] dt-bindings: usb: dwc3: xilinx: Add interrupt-names to
 include hibernation interrupt

Hi

> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Wednesday, April 19, 2023 12:10 AM
> To: Mehta, Piyush <piyush.mehta@....com>
> Cc: gregkh@...uxfoundation.org; krzysztof.kozlowski+dt@...aro.org;
> michal.simek@...inx.com; linux-usb@...r.kernel.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; Simek, Michal
> <michal.simek@....com>; Paladugu, Siva Durga Prasad
> <siva.durga.prasad.paladugu@....com>; linux-arm-
> kernel@...ts.infradead.org; git (AMD-Xilinx) <git@....com>
> Subject: Re: [PATCH] dt-bindings: usb: dwc3: xilinx: Add interrupt-names to
> include hibernation interrupt
> 
> On Wed, Apr 12, 2023 at 11:38:43AM +0530, Piyush Mehta wrote:
> > The hibernation feature enabled for Xilinx Versal NET SoC in DWC3 IP.
> > Added host mode interrupts and "usb-wakeup" interrupt-names optional
> > property in the binding schema to capture remote-wakeup and connect/
> > disconnect event in the hibernation state.
> >
> > Xilinx dwc3-core uses "host" and "otg" interrupts interrupt-names DT
> > properties from dwc3-core.
> 
> Is wakeup really not implemented in the DWC3 core, but outside it?

Wakeup is implemented inside the dwc3-core.

Initially we planned to implement wakeup interrupt name/interrupt optional property in the dwc3-core.
However, looking at other vendor wakeup interrupt implementation (Commit: dd566faebe9f dt-bindings: usb: qcom,dwc3: refine interrupt requirements)
we moved wakeup property to xilinx USB binding.

> 
> >
> > Signed-off-by: Piyush Mehta <piyush.mehta@....com>
> > ---
> > Note:
> > - Xilinx uses dwc3-cores interrupt-names DT property.
> >   Link:
> >   Xilinx-dwc3 core:
> https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bi
> ndings/usb/dwc3-xilinx.yaml#L129
> >   dwc3-core:
> > https://github.com/torvalds/linux/blob/master/Documentation/devicetree
> > /bindings/usb/snps%2Cdwc3.yaml#L42
> > ---
> >  Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml
> > b/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml
> > index 098b73134a1b..abc32db2448a 100644
> > --- a/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml
> > +++ b/Documentation/devicetree/bindings/usb/dwc3-xilinx.yaml
> > @@ -44,6 +44,15 @@ properties:
> >        - const: bus_clk
> >        - const: ref_clk
> >
> > +  interrupts:
> > +    items:
> > +      - description: Handle to the line usb-wakeup used to wake
> > +          up the host processor.
> > +
> > +  interrupt-names:
> > +    items:
> > +      - const: usb-wakeup
> 
> 'wakeup' is the standard name. And you also need 'wakeup-source'
> property.
> 
> > +
> >    resets:
> >      description:
> >        A list of phandles for resets listed in reset-names.
> > --
> > 2.25.1
> >