linux-kernel - Re: [PATCH 2/3] dt-bindings: clock: add qca8386/qca8084 clock and reset definitions

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Date:   Tue, 8 Aug 2023 08:46:29 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jie Luo <quic_luoj@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org,
        mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        p.zabel@...gutronix.de
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_srichara@...cinc.com
Subject: Re: [PATCH 2/3] dt-bindings: clock: add qca8386/qca8084 clock and
 reset definitions

On 08/08/2023 08:31, Jie Luo wrote:
> 
> 
> On 8/8/2023 1:57 PM, Krzysztof Kozlowski wrote:
>> On 08/08/2023 07:19, Jie Luo wrote:
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    const: qcom,nsscc-qca8k
>>>>
>>>> SoC name is before IP block names. See:
>>>> Documentation/devicetree/bindings/arm/qcom-soc.yaml
>>>>
>>>> qca8k is not SoC specific. I don't know what you are documenting here,
>>>> but if this is a SoC, then follow SoC rules.
>>>>
>>>> If this is not SoC, it confuses me a bit to use GCC binding.
>>>>
>>>> Anyway, this was not tested, as pointed out by bot... Please test the
>>>> code before sending.
>>>>
>>>> Best regards,
>>>> Krzysztof
>>>>
>>>
>>> Hi Krzysztof,
>>>
>>> Thanks for the review comments.
>>> qca8383/qca8084 is a network chip that support switch mode and PHY mode,
>>> the hardware register is accessed by MDIO bus, which is not a SOC.
>>>
>>> But it has the self-contained clock controller system, the clock
>>> framework of qca8386/qca8084 is same as the GCC of ipq platform such as
>>> ipq9574.
>>
>> OK
>>
>>>
>>> would you help advise whether we can document it with the compatible
>>> "qcom,qca8k-nsscc"?
>>
>> For example:
>> qcom,qca8084-nsscc
>>
>> Best regards,
>> Krzysztof
>>
> Thanks Krzysztof for the suggestion.
> 
> i will document the compatible below.
> "qcom,qca8084-nsscc" for the PHY mode of device.
> "qcom,qca8386-nsscc" for the switch mode of device.

The clocks seem to be exactly the same for both, so use only one
compatible in the driver (the fallback) and oneOf in the bindings like:

https://elixir.bootlin.com/linux/v6.3-rc6/source/Documentation/devicetree/bindings/sound/nvidia,tegra210-ope.yaml#L31

Best regards,
Krzysztof