netdev - Re: [PATCH net-next v4 3/6] dt-bindings: net: remove outdated hisilicon-femac

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Date: Tue, 27 Feb 2024 07:51:13 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Yang Xiwen <forbidden405@...look.com>,
 Yisen Zhuang <yisen.zhuang@...wei.com>, Salil Mehta
 <salil.mehta@...wei.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v4 3/6] dt-bindings: net: remove outdated
 hisilicon-femac

On 27/02/2024 02:43, Yang Xiwen wrote:
> On 2/26/2024 3:50 PM, Krzysztof Kozlowski wrote:
>> On 22/02/2024 13:43, Yang Xiwen via B4 Relay wrote:
>>> From: Yang Xiwen <forbidden405@...look.com>
>>>
>>> The user documented(Hi3516) is not found in current kernel anymore. And
>>> it seems this SoC has been EOL for a long time. While at it, Remove this
>>> binding entirely due to recent driver changes.
>>
>> This removes documented compatibles, which:
>> 1. should cause checkpatch issues,
>> 2. is not what we want.
>>
>> Driver is still there, so first the driver would have to be removed...
>> but then why do you add it immediately back? No, it does not work like that.
> 
> I has downloaded TRM for this old Hi3519 SoC. So i think with the new
> driver, it still works for Hi3519 FEMAC controller. So i'll rewrite
> these 3 patches and describe the whole thing in commit logs. i.e. the
> old binding is wrong, inconsistent with real hardware, etc..
> 
> So you mean conversion to YAML first, in a separate commit. And then do
> necessary edition to match the real hardware? I believe Hi3519 FEMAC and
> Hi3798MV200 FEMAC are compatible in hardware. So the old binding is
> wrong, missing critical hardware resources.

If you remove binding, then it has to be done in reverse order than
adding it (see DT submitting patches). However removing binding and
re-adding it, is not what you think. It's a obfuscated way to make a
change, so better just make a change and explicitly say why and what is
happening

Best regards,
Krzysztof