linux-kernel - Re: [PATCH 07/18] MIPS: DTS: jz4780: fix otg node as reported by dtbscheck

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Date:   Sat, 9 Apr 2022 15:32:31 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, letux-kernel@...nphoenux.org
Subject: Re: [PATCH 07/18] MIPS: DTS: jz4780: fix otg node as reported by
 dtbscheck



> Am 09.04.2022 um 15:15 schrieb Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>:
> 
> On 09/04/2022 15:05, H. Nikolaus Schaller wrote:
>>> 
>>> This looks wrong, the block usually should have a specific compatible.
>>> Please mention why it does not.
>> 
>> Well, I did not even have that idea that it could need an explanation.
>> 
>> There is no "ingenic,jz4780-otg" and none is needed here to make it work.
> 
> Make it work in what terms? We talk about hardware description, right?

Yes.

> 
>> 
>> Therefore the generic "snps,dwc2" is sufficient.
> 
> No, you are mixing now driver behavior (is sufficient) with hardware
> description.

No. "snps,dwc2" is a hardware description for a licensed block.
Not a driver behavior.

> Most of licensed blocks require the specific compatible to
> differentiate it.

If there is a need to differentiate.