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

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Date:   Mon, 14 Dec 2020 19:38:53 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     Rob Herring <robh+dt@...nel.org>
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: [EXTERNAL] Re: [PATCH v4] dt-bindings: usb: Add new compatible
 string for AM64 SoC

Hi Rob,
On 12/12/20 4:18 am, Rob Herring wrote:
> 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
> 

Thank you for the detailed explanation :) . I am sorry for not being
able figure this out on my own. I have sent a respin of this patch(v5).

Thanks,
Aswath

>> ```
>>
>> 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
>>>
>>