linux-kernel - Re: [PATCH net-next v8 4/9] dt-bindings: net: convert hisi-femac.txt to YAML

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Date: Thu, 7 Mar 2024 18:33:22 +0800
From: Yang Xiwen <forbidden405@...look.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 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 v8 4/9] dt-bindings: net: convert hisi-femac.txt
 to YAML

On 3/7/2024 3:48 PM, Krzysztof Kozlowski wrote:
> On 06/03/2024 10:28, Yang Xiwen wrote:
>> On 3/6/2024 3:39 PM, Krzysztof Kozlowski wrote:
>>> On 05/03/2024 08:51, Yang Xiwen via B4 Relay wrote:
>>>> From: Yang Xiwen <forbidden405@...look.com>
>>>>
>>>> Convert the old text binding to new YAML.
>>>>
>>>> While at it, make some changes to the binding:
>>>> - The version numbers are not documented publicly. The version also does
>>>> not change programming interface. Remove it until it's really needed.
>>>> - A few clocks are missing in old binding file. Add them to match the real
>>>> hardware.
>>>>
>>>> Signed-off-by: Yang Xiwen <forbidden405@...look.com>
>>>> ---
>>>>    .../bindings/net/hisilicon,hisi-femac.yaml         | 89 ++++++++++++++++++++++
>>>>    .../devicetree/bindings/net/hisilicon-femac.txt    | 41 ----------
>>>>    2 files changed, 89 insertions(+), 41 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/net/hisilicon,hisi-femac.yaml b/Documentation/devicetree/bindings/net/hisilicon,hisi-femac.yaml
>>>> new file mode 100644
>>>> index 000000000000..ba207f2c9ae4
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/net/hisilicon,hisi-femac.yaml
>>>> @@ -0,0 +1,89 @@
>>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/net/hisilicon,hisi-femac.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Hisilicon Fast Ethernet MAC controller
>>>> +
>>>> +maintainers:
>>>> +  - Yang Xiwen <forbidden405@...mail.com>
>>>> +
>>>> +allOf:
>>>> +  - $ref: ethernet-controller.yaml
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    items:
>>>> +      - enum:
>>>> +          - hisilicon,hi3516cv300-femac
>>>> +      - const: hisilicon,hisi-femac
>>> Drop this fallback, your later driver change does not use it, so neither
>>> should have binding. Explain in commit msg, that old binding was
>>> incorrect (we discussed it a lot) thus you are making such change during
>>> conversion.
>>
>> What about deprecating "hisilicon,hisi-femac-vn" compatibles and
>> introduce a new generic compatible "hisilicon,hisi-femac" instead? This
>> way, We can keep backward compatibility.
> What backward compatibility? Didn't you say bindings and driver are
> broken and you are going to break ABI to fix them up?


Yes, indeed the old binding is broken. I'm just wondering why you say 
"hisilicon,hisi-femac" should be removed. The FEMAC core on both SoCs 
are compatible afaik.


>
> Best regards,
> Krzysztof
>

-- 
Regards,
Yang Xiwen