linux-kernel - Re: [PATCH v3 05/12] dt-bindings: phy: renesas,usb2-phy: Add renesas,sysc-signals

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Message-ID: <797611e1-3786-45c4-9103-3ee8f96cec6d@tuxon.dev>
Date: Thu, 22 May 2025 17:39:47 +0300
From: Claudiu Beznea <claudiu.beznea@...on.dev>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: vkoul@...nel.org, kishon@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, p.zabel@...gutronix.de, geert+renesas@...der.be,
 magnus.damm@...il.com, yoshihiro.shimoda.uh@...esas.com, kees@...nel.org,
 gustavoars@...nel.org, biju.das.jz@...renesas.com,
 linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
 linux-hardening@...r.kernel.org, john.madieu.xa@...renesas.com,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v3 05/12] dt-bindings: phy: renesas,usb2-phy: Add
 renesas,sysc-signals



On 22.05.2025 15:48, Krzysztof Kozlowski wrote:
> On 22/05/2025 14:46, Krzysztof Kozlowski wrote:
>>>>>  
>>>>> +  - if:
>>>>> +      properties:
>>>>> +        compatible:
>>>>> +          contains:
>>>>> +            const: renesas,usb2-phy-r9a08g045
>>>>> +    then:
>>>>> +      required:
>>>>> +        - renesas,sysc-signals
>>>>
>>>> That's ABI break.
>>>
>>> There is no in kernel device tree users of "renesas,usb2-phy-r9a08g045"
>>> compatible. It is introduced in patch 11/12 from this series. With this do
>>> you still consider it ABI break?
>>
>> Then this patch cannot be split from binding introducing the user. Don't
>> add unused/undocumented compatibles.
>>
> Or you meant DTS?

Yes, I meant in tree DTS.

> I asked about ABI which is not about in-kernel users.
> You can always change in-kernel users, so what would be any point of a
> binding and its ABI?
> 
> Best regards,
> Krzysztof