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 15:37:51 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Paul Cercueil <paul@...pouillou.net>,
        Rob Herring <robh+dt@...nel.org>,
        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 15:23 schrieb Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>:
> 
> On 09/04/2022 15:18, H. Nikolaus Schaller wrote:
> hould have a specific compatible.
>>>> Please mention why it does not.
>>> 
>>> Agreed. The "snps,dwc2" should be a fallback string, otherwise there is no way to uniquely identify the JZ4780 implementation of the IP.
>> 
>> Well, there is no specifc implementation and driver for it. So no need to uniquely identify it.
> 
> Specific implementation and driver are not arguments here. This does not
> matter. It's really unrelated argument.

The argumentation is in reverse: if there is no need for a specialized driver or implementation,
why is there is a need to define a specialization.

Your argument was:
"there is no way to uniquely identify the JZ4780 implementation of the IP"

My question is:
"what do we need that for?"

> Bindings are not about implementation in Linux. Implementation can
> change, so bindings should also?

No. Implementations should be agnostic.