linux-kernel - Re: [PATCH] dt-bindings: usb: add properties for hard wired devices

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Message-ID: <CAL_Jsq+UxJAGv4+om1BFAJbq1VETnY4UvpqgGs3mSP8e1kkFmQ@mail.gmail.com>
Date:   Tue, 29 Sep 2020 08:56:07 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Linux USB List <linux-usb@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] dt-bindings: usb: add properties for hard wired devices

On Tue, Sep 29, 2020 at 1:09 AM Chunfeng Yun <chunfeng.yun@...iatek.com> wrote:
>
> On Mon, 2020-09-28 at 13:12 -0500, Rob Herring wrote:
> > On Mon, Sep 28, 2020 at 02:39:50PM +0800, Chunfeng Yun wrote:
> > > Add some optional properties which are needed for hard wired devices
> > >
> > > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > > ---
> > >  Documentation/devicetree/bindings/usb/usb-hcd.yaml | 11 +++++++++++
> > >  1 file changed, 11 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/usb/usb-hcd.yaml b/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> > > index 7263b7f2b510..1194a82887e7 100644
> > > --- a/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> > > +++ b/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> > > @@ -22,6 +22,17 @@ properties:
> > >      description:
> > >        Name specifier for the USB PHY
> > >
> > > +  "#address-cells":
> > > +    const: 1
> > > +
> > > +  "#size-cells":
> > > +    const: 0
> > > +
> > > +patternProperties:
> > > +  "^hub|device@[0-9a-f]+$":
> >
> > Could be any class of device, so '@[0-9a-f]+$'
> You mean we will use different standard node name for each usb class?
> e.g.
> Use 'ethernet@*' for a usb ethernet adapter, and use 'camera@*' for a
> usb camera sensor?

Yes.

> > > +    type: object
> > > +    description: The hard wired USB devices. See usb/usb-device.txt
> >
> > Ideally, we'd convert usb-device.txt to schema and reference it here.
> Ok, I'll try to do it.
>
> BTW: Does the compatible support pattern? Is there any example I can
> refer to?

Yes, use 'pattern' keyword.

Rob