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Message-ID: <dc9773aa-690f-47b5-b60a-a79c1e2dbaf2@linaro.org>
Date: Thu, 25 Jan 2024 11:32:21 +0100
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Subject: Re: [PATCH v2 1/2] dt-bindings: usb: mt6360-tcpc: Drop
 interrupt-names
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To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
 Conor Dooley <conor@kernel.org>, robh+dt@kernel.org,
 krzysztof.kozlowski+dt@linaro.org
Cc: chunfeng.yun@mediatek.com, gregkh@linuxfoundation.org,
 conor+dt@kernel.org, matthias.bgg@gmail.com, linux@roeck-us.net,
 heikki.krogerus@linux.intel.com, cy_huang@richtek.com,
 linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240119094105.98312-1-angelogioacchino.delregno@collabora.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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On 24/01/2024 09:48, AngeloGioacchino Del Regno wrote:
> Il 23/01/24 18:14, Conor Dooley ha scritto:
>> On Mon, Jan 22, 2024 at 11:32:30AM +0100, AngeloGioacchino Del Regno wrote:
>>> Il 19/01/24 17:32, Conor Dooley ha scritto:
>>>> On Fri, Jan 19, 2024 at 10:41:04AM +0100, AngeloGioacchino Del Regno wrote:
>>>>> This IP has only one interrupt, hence interrupt-names is not necessary
>>>>> to have.
>>>>> Since there is no user yet, simply remove interrupt-names.
>>>>
>>>> I'm a bit confused chief. Patch 2 in this series removes a user of this
>>>> property from a driver, so can you explain how this statement is true?
>>>>
>>>> Maybe I need to drink a few cans of Monster and revisit this patchset?
>>>>
>>>
>>> What I mean with "there is no user" is that there's no device tree with any
>>> mt6360-tcpc node upstream yet, so there is no meaningful ABI breakage.
>>> Different story would be if there was a device tree using this already, in
>>> which case, you can make a required property optional but not remove it.
>>
>> Not every devicetree lives within the kernel.. If the driver is using
>> it, I'm not inclined to agree that it should be removed.
> 
> I get the point, but as far as I remember, it's not the first time that this
> kind of change is upstreamed.
> 
> I'm fine with keeping things as they are but, since my intention is to actually
> introduce an actual user of this binding upstream, and that actually depends on
> if this change is accepted or not (as I have to know whether I can omit adding
> the interrupt-names property or not)....
> 
> ....may I ask for more feedback/opinions from Rob and/or Krzk?

Driver is the user and this is an old binding (released!), thus there
can be out-of-kernel users already.

Minor cleanup is not really a reason to affect ABI. You could deprecate
it, though. Driver change is fine.

Best regards,
Krzysztof