linux-kernel - Re: [PATCH 1/4] dt-bindings: memory: additional compatible strings for Broadcom DPFE

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Date:   Wed, 6 Dec 2023 08:32:27 -0800
From:   Florian Fainelli <florian.fainelli@...adcom.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Markus Mayer <mmayer@...adcom.com>,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] dt-bindings: memory: additional compatible strings
 for Broadcom DPFE



On 12/6/2023 3:09 AM, Krzysztof Kozlowski wrote:
> On 05/12/2023 19:47, Markus Mayer wrote:
>> Add versioned compatible strings for Broadcom DPFE. These take the form
>> brcm,dpfe-cpu-v<N> where <N> is a number from 1 to 4.
>>
>> These API version related compatible strings are more specific than the
>> catch-all "brcm,dpfe-cpu" and more generic than chip-specific compatible
>> strings.
> 
> None of this explains: Why? I don't see any point in this and commit
> does not explain.
> 
>>
>> Signed-off-by: Markus Mayer <mmayer@...adcom.com>
>> ---
>>   .../bindings/memory-controllers/brcm,dpfe-cpu.yaml        | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.yaml b/Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.yaml
>> index 08cbdcddfead..6dffa7b62baf 100644
>> --- a/Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.yaml
>> +++ b/Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.yaml
>> @@ -16,6 +16,11 @@ properties:
>>         - enum:
>>             - brcm,bcm7271-dpfe-cpu
>>             - brcm,bcm7268-dpfe-cpu
>> +      - enum:
>> +          - brcm,dpfe-cpu-v1
>> +          - brcm,dpfe-cpu-v2
>> +          - brcm,dpfe-cpu-v3
>> +          - brcm,dpfe-cpu-v4
> 
> No, that's just wrong. So you want to say bcm7271 is brcm,dpfe-cpu-v4?

No as the example shows it "speaks" API v1.

I would be inclined to completely remove the chip specific compatible 
strings from the binding because they are not sufficient or descriptive 
enough to determine which API version is being spoken, since the 
firmware is unfortunately allowed to change major APIs (and the 
messaging format, because why not?) at a moments notice.
-- 
Florian

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