linux-kernel - Re: [PATCH 4/4] dts: iot2050: Support IOT2050-SM variant

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Date: Tue, 19 Dec 2023 16:42:12 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Jan Kiszka <jan.kiszka@...mens.com>, Nishanth Menon <nm@...com>,
 Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Bao Cheng Su <baocheng.su@...mens.com>,
 Chao Zeng <chao.zeng@...mens.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, Li Hua Qian <huaqian.li@...mens.com>
Subject: Re: [PATCH 4/4] dts: iot2050: Support IOT2050-SM variant

On 19/12/2023 16:40, Jan Kiszka wrote:
> On 19.12.23 16:39, Krzysztof Kozlowski wrote:
>> On 19/12/2023 16:37, Jan Kiszka wrote:
>>>>>>
>>>>>> You have label for that... Somehow all these nodes are half-baked,
>>>>>> without all the expected properties and now you call node name as ABI.
>>>>>> The node name is not the ABI.
>>>>>
>>>>> Well, existing userspace uses those names, and adding the properties
>>>>> would break that interface. Now, does Linux do that?
>>>>
>>>> I don't think you understood the concept. There is no change for
>>>> userspace. Same interface, same names. No ABI break.
>>>
>>> I do understand the impact very well:
>>> open("/sys/class/leds/user-led1-red") has to work for all the variants,
>>> consistently and backward-compatible for userspace.
>>
>> And it will. The name is the same.
> 
> Nope, it's not - I tried that already :)
> 
> root@...2050-debian:~# ls -l /sys/class/leds/
> total 0
> lrwxrwxrwx 1 root root 0 Dec 19 09:49 green:indicator -> ../../devices/platform/leds/leds/green:indicator

And how does your DTS look like?

Because I also tried and it is exactly the same.

Best regards,
Krzysztof