linux-kernel - RE: [PATCH v3 2/2] dt-bindings: usb: dwc3: Add Realtek DHC RTD SoC DWC3 USB

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Date:   Fri, 11 Aug 2023 05:58:25 +0000
From:   Stanley Chang[昌育德] <stanley_chang@...ltek.com>
To:     Rob Herring <robh@...nel.org>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "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>
Subject: RE: [PATCH v3 2/2] dt-bindings: usb: dwc3: Add Realtek DHC RTD SoC DWC3 USB

Hi Rob,

> > +
> > +examples:
> > +  - |
> > +    usb@...13e00 {
> > +        compatible = "realtek,rtd1319d-dwc3", "realtek,rtd-dwc3";
> > +        reg = <0x98013e00 0x200>;
> > +        #address-cells = <1>;
> > +        #size-cells = <1>;
> > +        ranges;
> > +        maximum-speed = "high-speed";
> 
> This should be a warning (the bot was having problems) as it is not defined for
> this node. It belongs in the child node as you also have, so drop it.

As I mentioned in the v1 patch, I have a problem.
This property maximum-speed belongs to dwc3.
When the dwc3-rtk setting disables USB 3.0 phy, dwc3 is not probed.
So I can't use api usb_get_maximum_speed(dev) to get maximum-speed.

I added this property "maximum-speed" to the dwc3-rtk node, which is the same as the dwc3 core node.
Is this configuration appropriate?
Or do you have any suggestion?

> > +
> > +        usb@...50000 {
> > +            compatible = "snps,dwc3";
> > +            reg = <0x98050000 0x9000>;
> > +            interrupts = <0 94 4>;
> > +            phys = <&usb2phy &usb3phy>;
> > +            phy-names = "usb2-phy", "usb3-phy";
> > +            dr_mode = "otg";
> > +            usb-role-switch;
> > +            role-switch-default-mode = "host";
> > +            snps,dis_u2_susphy_quirk;
> > +            snps,parkmode-disable-ss-quirk;
> > +            snps,parkmode-disable-hs-quirk;
> > +            maximum-speed = "high-speed";
> > +        };
> > +    };
> > --
> > 2.34.1
> >

Thanks,
Stanley