linux-kernel - Re: [PATCH v2 4/7] dt-bindings: net: dsa: mediatek,mt7530: define port binding per compatible

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Date:   Sat, 20 Aug 2022 10:34:08 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 v2 4/7] dt-bindings: net: dsa: mediatek,mt7530: define
 port binding per compatible

On 19.08.2022 15:43, Krzysztof Kozlowski wrote:
> On 13/08/2022 18:44, Arınç ÜNAL wrote:
>> Define DSA port binding under each compatible device as each device
>> requires different values for certain properties.
>>
>> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
>> ---
>>   .../bindings/net/dsa/mediatek,mt7530.yaml     | 116 +++++++++++++-----
>>   1 file changed, 87 insertions(+), 29 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
>> index cc87f48d4d07..ff51a2f6875f 100644
>> --- a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
>> +++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
>> @@ -130,35 +130,6 @@ properties:
>>         ethsys.
>>       maxItems: 1
>>   
>> -patternProperties:
>> -  "^(ethernet-)?ports$":
>> -    type: object
>> -
>> -    patternProperties:
>> -      "^(ethernet-)?port@[0-9]+$":
>> -        type: object
>> -        description: Ethernet switch ports
>> -
> 
> my comments from v1 apply here
> 
> None of the reasons you said force you to define properties in some
> allOf:if:then subblock. These force you to constrain the properties in
> allOf:if:then, but not define.
> 
> 
>> I can split patternProperties to two sections, but I can't directly
>> define the reg property like you put above.
> 
> Of course you can and original bindings were doing it.
> 
> Let me ask specific questions (yes, no):
> 1. Are ethernet-ports and ethernet-port present in each variant?
> 2. Is dsa-port.yaml applicable to each variant? (looks like that - three
> compatibles, three all:if:then)
> 3. If reg appearing in each variant?
> 4. If above is true, if reg is maximum one item in each variant?

All yes.

> 
> Looking at your patch, I think answer is 4x yes, which means you can
> define them in one place and constrain in allOf:if:then, just like all
> other schemas, because this one is not different.

If I understand correctly, I do this already with v3. Properties are 
defined under the constructed node. Accepted values for properties are 
constrained under if:then.

Arınç