[PATCH linux-next] dt-bindings: usb: snps,dwc3: correct i.MX8MQ support

[Peng Fan]

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
> Sent: 2023年3月20日 20:06
> To: Peng Fan <peng.fan at nxp.com>; Peng Fan (OSS)
> <peng.fan at oss.nxp.com>; gregkh at linuxfoundation.org;
> robh+dt at kernel.org; krzysztof.kozlowski+dt at linaro.org;
> shawnguo at kernel.org; s.hauer at pengutronix.de; Xu Yang
> <xu.yang_2 at nxp.com>
> Cc: kernel at pengutronix.de; festevam at gmail.com; dl-linux-imx <linux-
> imx at nxp.com>; linux-usb at vger.kernel.org; devicetree at vger.kernel.org;
> linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org; Jun Li
> <jun.li at nxp.com>
> Subject: Re: [PATCH linux-next] dt-bindings: usb: snps,dwc3: correct
> i.MX8MQ support
> 
> On 20/03/2023 12:44, Peng Fan wrote:
> >> Subject: Re: [PATCH linux-next] dt-bindings: usb: snps,dwc3: correct
> >> i.MX8MQ support
> >>
> >> On 20/03/2023 12:02, Peng Fan wrote:
> >>>> Subject: Re: [PATCH linux-next] dt-bindings: usb: snps,dwc3:
> >>>> correct i.MX8MQ support
> >>>>
> >>>> On 20/03/2023 03:07, Peng Fan (OSS) wrote:
> >>>>> From: Peng Fan <peng.fan at nxp.com>
> >>>>>
> >>>>> The previous i.MX8MQ support breaks rockchip,dwc3 support, so use
> >>>>> select to restrict i.MX8MQ support and avoid break others.
> >>>>>
> >>>>> Fixes: 3754c41c7686 ("dt-bindings: usb: snps,dwc3: support
> >>>>> i.MX8MQ")
> >>>>> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> >>>>> ---
> >>>>>  .../devicetree/bindings/usb/snps,dwc3.yaml    | 21 ++++++++++++----
> ---
> >>>>>  1 file changed, 14 insertions(+), 7 deletions(-)
> >>>>>
> >>>>> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> >>>>> b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> >>>>> index 16c7d06c9172..6347a6769ee3 100644
> >>>>> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> >>>>> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> >>>>> @@ -28,15 +28,22 @@ allOf:
> >>>>>      else:
> >>>>>        $ref: usb-xhci.yaml#
> >>>>>
> >>>>> +select:
> >>>>> +  properties:
> >>>>> +    compatible:
> >>>>> +      contains:
> >>>>> +        enum:
> >>>>> +          - fsl,imx8mq-dwc3
> >>>>
> >>>> And what about all snps,dwc3 devices there (without specific
> compatible)?
> >>>> Previously they were selected and now they are not... so you just
> >>>> disabled schema for all of them.
> >>> [Peng Fan]
> >>>
> >>> I am not sure how to address:
> >>>
> >>
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flor
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> >>> .kernel.org%2Fall%2FCAL_Jsq%2BnrqTX5ND3%3D%2BkFUmStx-
> >> %2Bb%3DqpE_WsL_Le
> >>> -YX8c285-
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> 5A%40mail.gmail.com%2F&data=05%7C01%7Cpeng.fan%40nxp.com%7C1e
> >>>
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> 67df79692243f058fa08db2937befd%7C686ea1d3bc2b4c6fa92cd99c5c30163
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> >>>
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> >> data=r1
> >>>
> fesB1c%2B3YxohCGM36xySFucVU25WVYIMlpgGkdoWk%3D&reserved=0
> >>>
> >>> Rob suggested use select, but I am not sure how to use it here. Use
> >>> an extra yaml file with select or else.
> >>>
> >>>>
> >>>>> +  required:
> >>>>> +    - compatible
> >>>>> +
> >>>>>  properties:
> >>>>>    compatible:
> >>>>> -    oneOf:
> >>>>> -      - items:
> >>>>> -          - const: fsl,imx8mq-dwc3
> >>>>
> >>>> I don't understand why you remove your compatible.
> >>> [Peng Fan]
> >>>
> >>> My last change drops 'contains' by mistake, and breaks
> >>
> >> This I understand.
> >>
> >>> rockchip,dwc3, so just bring back the original content
> >>
> >> This is not a reason to make your compatible undocumented. You
> >> basically revert your patch. It does not make any sense to me.
> > [Peng Fan]
> >
> > ok, let me think more. Honestly not have good idea (:
> > If you have any guidance, that would be helpful.
> 
> You should only need a select, however most likely selecting also
> snps,dwc3 (without specific compatible). Anyway this binding - including
> how it is referenced by others - is getting unmanagable. I think I commented
> about this on some other occasion. The point is that no one refactors it thus
> it grows and grows leading to more of such tricky scenarios.
> 
> How it should be refactored? Probably just like all other with re-usable
> components: common part and device specific bindings including it. While
> snps,dwc3 alone should not be allowed anymore.

Thanks, I may take rockchip,dwc3.yaml or other vendor,dwc3.yaml as
reference to introduce fsl-imx8mq,dwc3.yaml to just add a select, and
drop the fsl,imx8mq-dwc3 compatible from snps,dwc3.yaml.

Thanks,
Peng.

> 
> Best regards,
> Krzysztof