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Subject: Re: [PATCH 02/16] dt-bindings: spi: Add bcmbca-hsspi controller
 support
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Linux SPI List <linux-spi@vger.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@broadcom.com>
Cc:     anand.gore@broadcom.com, tomer.yacoby@broadcom.com,
        dan.beygelman@broadcom.com, joel.peshkin@broadcom.com,
        jonas.gorski@gmail.com, kursad.oney@broadcom.com, dregan@mail.com,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Mark Brown <broonie@kernel.org>,
        Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20230106200809.330769-1-william.zhang@broadcom.com>
 <20230106200809.330769-3-william.zhang@broadcom.com>
 <b529a53b-d00c-063d-a58d-e64b0300605d@linaro.org>
 <5dfac2d7-3b4b-9ded-0dde-26b289c604d0@broadcom.com>
 <99b01e96-3b96-6692-c5e1-87db49295e6d@linaro.org>
 <49925933-aacc-4f0d-a1ca-e1bd45b05eee@broadcom.com>
 <b246a81f-e465-5e52-f0ce-65e0a82fc3e1@linaro.org>
 <32a464f8-6a4b-6777-9775-f17e990e0c6a@gmail.com>
 <71c2e796-f0fb-90cd-4599-13c9718f41d5@linaro.org>
From:   William Zhang <william.zhang@broadcom.com>
Message-ID: <31644849-dc69-ddfc-a6b6-6ffd37d64d2b@broadcom.com>
Date:   Wed, 11 Jan 2023 10:04:16 -0800
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On 01/11/2023 01:02 AM, Krzysztof Kozlowski wrote:
> On 10/01/2023 23:18, Florian Fainelli wrote:
>> On 1/10/23 00:40, Krzysztof Kozlowski wrote:
>>>>> No, it is discouraged in such forms. Family or IP block compatibles
>>>>> should be prepended with a specific compatible. There were many issues
>>>>> when people insisted on generic or family compatibles...
>>>>>
>>>>>> Otherwise we will have to have a compatible string with chip model for
>>>>>> each SoC even they share the same IP. We already have more than ten of
>>>>>> SoCs and the list will increase.  I don't see this is a good solution too.
>>>>>
>>>>> You will have to do it anyway even with generic fallback, so I don't get
>>>>> what is here to gain... I also don't get why Broadcom should be here
>>>>> special, different than others. Why it is not a good solution for
>>>>> Broadcom SoCs but it is for others?
>>>>>
>>>> I saw a few other vendors like these qcom ones:
>>>>     qcom,spi-qup.yaml
>>>>         - qcom,spi-qup-v1.1.1 # for 8660, 8960 and 8064
>>>>         - qcom,spi-qup-v2.1.1 # for 8974 and later
>>>>         - qcom,spi-qup-v2.2.1 # for 8974 v2 and later
>>>>     qcom,spi-qup.yaml
>>>>         const: qcom,geni-spi
>>>
>>> IP block version numbers are allowed when there is clear mapping between
>>> version and SoCs using it. This is the case for Qualcomm because there
>>> is such clear mapping documented and available for Qualcomm engineers
>>> and also some of us (although not public).
>>>
>>>> I guess when individual who only has one particular board/chip and is
>>>> not aware of the IP family,  it is understandable to use the chip
>>>> specific compatible string.
>>>
>>> Family of devices is not a versioned IP block.
>>
>> Would it be acceptable to define for instance:
>>
>> - compatible = "brcm,bcm6868-hsspi", "brcm,bcmbca-hsspi";
> 
> Yes, this is perfectly valid. Although it does not solve William
> concerns because it requires defining specific compatibles for all of
> the SoCs.
> 
> Best regards,
> Krzysztof
> 
As I mentioned in another email,  I would be okay to use these 
compatibles to differentiate by ip rev and to conforms to brcm convention:
"brcm,bcmXYZ-hsspi", "brcm,bcmbca-hsspi-v1.0", "brcm,bcmbca-hsspi";
"brcm,bcmXYZ-hsspi", "brcm,bcmbca-hsspi-v1.1", "brcm,bcmbca-hsspi";

In the two drivers I included in this series, it will be bound to 
brcm,bcmbca-hsspi-v1.0 (in additional to brcm,bcm6328-hsspi) and 
brcm,bcmbca-hsspi-v1.1 respectively.  This way we don't need to update 
the driver with a new soc specific compatible whenever a new chips comes 
out.

Does this sound good to you?

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