linux-kernel - Re: [PATCH net-next v9 8/9] net: hisi_femac: add support for hisi

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Date: Fri, 8 Mar 2024 09:09:59 +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 v9 8/9] net: hisi_femac: add support for
 hisi_femac core on Hi3798MV200

On 08/03/2024 09:07, Yang Xiwen wrote:
> On 3/8/2024 4:02 PM, Krzysztof Kozlowski wrote:
>> On 07/03/2024 12:34, Yang Xiwen via B4 Relay wrote:
>>> From: Yang Xiwen <forbidden405@...look.com>
>>>
>>> Register the sub MDIO bus if it is found. Also implement the internal
>>> PHY reset procedure as needed.
>> ...
>>
>>>   
>>> @@ -946,6 +991,7 @@ static int hisi_femac_drv_resume(struct platform_device *pdev)
>>>   
>>>   static const struct of_device_id hisi_femac_match[] = {
>>>   	{.compatible = "hisilicon,hi3516cv300-femac",},
>>> +	{.compatible = "hisilicon,hi3798mv200-femac",},
>>
>> Why do you keep growing this table?
> 
> 
> I'm completely confused. Don't I need to keep binding and driver 
> compatible ids sync?
> 
> 
> The FEMAC cores on 2 SoCs are compatible afaik. That's why i want to add 
> a generic "hisilicon,hisi-femac" compatible. Though i know nothing about 
> the mysterious version numbers (v1, v2 etc..) documented in the old 
> binding, so i want them to be removed. Instead only keep one generic 
> fallback compatible.
> 
> 
> Do you mean that i broke the backward compatibility for 
> "hisilicon,hi3516cv300-femac"?

No. I meant, use one as fallback and only fallback needs to be in the
device ID table. There are dozens if not hundreds of such examples in
the tree.

Best regards,
Krzysztof