linux-kernel - Re: [PATCH 1/1] dt-bindings: net: convert qca,qca7000.txt yaml format

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Message-ID: <ef00a8e6-4121-42d2-a752-a3dbd7244f16@kernel.org>
Date: Mon, 2 Jun 2025 22:21:30 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Frank Li <Frank.li@....com>, Stefan Wahren <wahrenst@....net>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
 imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] dt-bindings: net: convert qca,qca7000.txt yaml format

On 02/06/2025 17:35, Frank Li wrote:
> 
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: qca,qca7000
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  interrupts:
>>> +    maxItems: 1
>>> +
>>> +  spi-cpha: true
>>> +
>>> +  spi-cpol: true
>> In case of a SPI setup these properties should be required. Unfortunately
>> i'm not sure how to enforce this. Maybe depending on the presence of "reg"?
> 
> But It think depend on reg is not good idea, which too obscure. Ideally it
> should be use two compatible strings. It should treat as two kinds device.
> It is really old devices and not worth to update compatible string.
> 
> Maybe some one in dt team can provide suggestion!
> 
> Rob and Krzysztof Kozlowski:
>   any idea about this?
You can check for reg and require these, e.g.:
https://elixir.bootlin.com/linux/v6.4-rc7/source/Documentation/devicetree/bindings/net/qcom,ipa.yaml#L191

See also for very similar case:
Documentation/devicetree/bindings/net/dsa/realtek.yaml

However for multi-bus devices we usually do not code such constraints.
Partially because of typical cases - i2c and spi - it would not be possible.

Best regards,
Krzysztof