netdev - Re: [PATCH v4 4/6] dt-bindings: net: dsa: mediatek,mt7530: define port binding per switch

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Date:   Thu, 25 Aug 2022 09:33:00 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        Sander Vanheule <sander@...nheule.net>,
        René van Dorst <opensource@...rst.com>,
        Daniel Golle <daniel@...rotopia.org>, erkin.bozoglu@...ont.com,
        Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/6] dt-bindings: net: dsa: mediatek,mt7530: define
 port binding per switch

On 23/08/2022 15:29, Arınç ÜNAL wrote:
> 
> 
> On 23.08.2022 13:47, Krzysztof Kozlowski wrote:
>> On 20/08/2022 11:07, Arınç ÜNAL wrote:
>>> Define DSA port binding per switch model as each switch model requires
>>> different values for certain properties.
>>>
>>> Define reg property on $defs as it's the same for all switch models.
>>>
>>> Remove unnecessary lines as they are already included from the referred
>>> dsa.yaml.
>>>
>>> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
>>> ---
>>>   .../bindings/net/dsa/mediatek,mt7530.yaml     | 56 +++++++++++--------
>>>   1 file changed, 34 insertions(+), 22 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
>>> index 657e162a1c01..7c4374e16f96 100644
>>> --- a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
>>> +++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
>>> @@ -130,38 +130,47 @@ properties:
>>>         ethsys.
>>>       maxItems: 1
>>>   
>>> -patternProperties:
>>> -  "^(ethernet-)?ports$":
>>> -    type: object
>>> -
>>> -    patternProperties:
>>> -      "^(ethernet-)?port@[0-9]+$":
>>> -        type: object
>>> -        description: Ethernet switch ports
>>
>> Again, I don't understand why do you remove definitions of these nodes
>> from top-level properties. I explained what I expect in previous
>> discussion and I am confused to hear "this cannot be done".
> 
> I agree it can be done, but the binding is done with less lines the 
> current way.
> 
> I would need to add more lines than just for creating the node structure 
> since dsa.yaml is not referred.
> 
> Then, I would have to create the node structure again for the dsa-port 
> checks.

I understand you can create binding more concise, but not necessarily
more readable. The easiest to grasp is to define all the nodes in
top-level and customize them in allOf:if:then. This was actually also
needed for earlier dtschema with additionalProperties:false. You keep
defining properties in allOf:if:then, even though they are all
applicable to all variants. That's unusual and even if it reduces the
lines does not make it easier to grasp.


Best regards,
Krzysztof