linux-kernel - Re: [RFC PATCH v2 3/3] dt-bindings: usb: snps,dwc3: add generic-xhci as child

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Date:   Mon, 2 Jan 2023 14:45:17 +0900
From:   Jung Daehwan <dh10.jung@...sung.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, sc.suh@...sung.com,
        taehyun.cho@...sung.com, jh0801.jung@...sung.com,
        eomji.oh@...sung.com
Subject: Re: [RFC PATCH v2 3/3] dt-bindings: usb: snps,dwc3: add
 generic-xhci as child

On Thu, Dec 29, 2022 at 11:23:02AM +0100, Krzysztof Kozlowski wrote:
> On 29/12/2022 10:57, Daehwan Jung wrote:
> > Currently, dwc3 invokes just xhci platform driver(generic-xhci) without
> > DT schema even though xhci works as child of dwc3. It makes sense to add
> > xhci as child of dwc3 with DT schema. It also supports to use another
> > compatible in xhci platform driver.
> 
> You use some driver as an argument for hardware description, which is
> not what we need. Describe the hardware.
> 

OK. I will it on next submission.

> > 
> > Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> > ---
> >  .../devicetree/bindings/usb/snps,dwc3.yaml    | 29 +++++++++++++++++++
> >  1 file changed, 29 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> > index 6d78048c4613..83ed7c526dba 100644
> > --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> > +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> > @@ -360,8 +360,22 @@ properties:
> >      description:
> >        Enable USB remote wakeup.
> >  
> > +  "#address-cells":
> > +    enum: [ 1, 2 ]
> > +
> > +  "#size-cells":
> > +    enum: [ 1, 2 ]
> > +
> > +  ranges: true
> > +
> >  unevaluatedProperties: false
> >  
> > +# Required child node:
> > +patternProperties:
> > +  "^usb@[0-9a-f]+$":
> > +    $ref: generic-xhci.yaml#
> > +    description: Required child node
> 
> DWC does not have another piece of controller as child... DWC is the
> controller. Not mentioning that you now affect several other devices
> without describing the total hardware picture (just some drivers which
> is not that relevant).
> 

DWC controller supports USB Host mode and it uses same resource and
really works as a child. I guess it's same on many SOCs, especially
mobile..

I just want to modify it to work with DT schema (dwc3 -> xhci-plat).
I think it needs to dicuss more..

Best Regards,
Jung Daehwan.

> > +
> >  required:
> >    - compatible
> >    - reg
> > @@ -388,4 +402,19 @@ examples:
> >        snps,dis_u2_susphy_quirk;
> >        snps,dis_enblslpm_quirk;
> >      };
> > +  - |
> > +    usb@...00000 {
> > +      compatible = "snps,dwc3";
> > +      reg = <0x4a200000 0xcfff>;
> > +      interrupts = <0 92 4>;
> > +      #address-cells = <1>;
> > +      #size-cells = <1>;
> > +      ranges;
> > +
> > +      xhci: usb@...00000 {
> > +        compatible = "generic-xhci";
> 
> There are no such device...
> 

> > +        reg = <0x4a200000 0x7fff>;
> > +        interrupts = <0 92 4>;
> > +      };
> > +    };
> >  ...
> 
> Best regards,
> Krzysztof
> 
>