linux-kernel - Re: [PATCH v4] dt-bindings: usb: Add new compatible string for AM64 SoC

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Date:   Fri, 11 Dec 2020 16:48:25 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Aswath Govindraju <a-govindraju@...com>
Cc:     Vignesh Raghavendra <vigneshr@...com>,
        Sekhar Nori <nsekhar@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Roger Quadros <rogerq@...com>,
        Linux USB List <linux-usb@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] dt-bindings: usb: Add new compatible string for AM64 SoC

On Fri, Dec 11, 2020 at 6:04 AM Aswath Govindraju <a-govindraju@...com> wrote:
>
> Hi,
> On 11/12/20 11:34 am, Aswath Govindraju wrote:
> > Add compatible string in j721e-usb binding file as the same USB subsystem
> > is present in AM64.
> >
> > Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> > ---
> >
> > Changes since v3:
> > - used enum instead of anyOf.
> >
> > Changes since v2:
> > - added changes done over the versions.
> >
> > Changes since v1:
> > - replaced the '\t' at the beginning of the lines with spaces as it was
> >   causing the dt_binding_check to fail.
> >
> >  Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml b/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml
> > index 388245b91a55..1a5c7bbb40d1 100644
> > --- a/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml
> > +++ b/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml
> > @@ -11,8 +11,9 @@ maintainers:
> >
> >  properties:
> >    compatible:
> > -    items:
> > -      - const: ti,j721e-usb
> > +    enum:
> > +      - ti,j721e-usb
> > +      - ti,am64-usb
> >
>
> I am trying to use the compatible strings in the following manner
>
> ```
> compatible = "ti,am64-usb", "ti,j721e-usb";
>
> ```
> If I use above patch I am getting an error while doing a dtbs check.
>
> ```
> /home/gsaswath/src/ti-linux-kernel/arch/arm64/boot/dts/ti/k3-am642-evm.dt.yaml:
> cdns-usb@...0000: compatible: Additional items are not allowed
> ('ti,j721e-usb' was unexpected)
>         From schema:
> /home/gsaswath/src/ti-linux-kernel/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml
> /home/gsaswath/src/ti-linux-kernel/arch/arm64/boot/dts/ti/k3-am642-evm.dt.yaml:
> cdns-usb@...0000: compatible: ['ti,am64-usb', 'ti,j721e-usb'] is too long
>         From schema:
> /home/gsaswath/src/ti-linux-kernel/Documentation/devicetree/bindings/usb/ti,j721e-usb.yaml
>
> ```
>
>
> I have looked around for examples but I am unable to find a similar
> case. I tried using anyOf in the following manner

You didn't look hard enough. There are lots.

> ```
> compatible:
>      anyOf:
>         - const: ti,am64-usb
>         - const: ti,j721e-usb

This is really no different than a single 'enum' with the 2 values.
'anyOf' means one or more in the list are true, but more than 1 is
impossible here.

If you have different possible lengths of values, then you need
'oneOf' for each case and then 'items' when you have a value with
multiple entries:

oneOf:
  - const: ti,j721e-usb
  - items:
      - const: ti,am64-usb
      - const: ti,j721e-usb

> ```
>
> But I am getting an error
>
> ```
> /home/gsaswath/src/ti-linux-kernel/Documentation/devicetree/bindings/usb/ti,j721e-usb.example.dt.yaml:
> cdns_usb@...4000: compatible: 'anyOf' conditional failed, one must be fixed:
>         Additional items are not allowed ('ti,j721e-usb' was unexpected)
>         ['ti,am64-usb', 'ti,j721e-usb'] is too long
>         'ti,j721e-usb' was expected
> ```
>
> Doesn't anyof mean that the compatible strings can be used in any
> combination ??
>
> Thanks,
> Aswath
>
> >    reg:
> >      description: module registers
> >
>