linux-kernel - Re: [PATCH v2 1/2] dt-bindings: devfreq: mediatek: Add mtk cci devfreq dt-bindings

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Date:   Thu, 14 Apr 2022 05:54:31 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Johnson Wang <johnson.wang@...iatek.com>,
        cw00.choi@...sung.com, krzk+dt@...nel.org, robh+dt@...nel.org,
        kyungmin.park@...sung.com
Cc:     khilman@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, jia-wei.chang@...iatek.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2 1/2] dt-bindings: devfreq: mediatek: Add mtk cci
 devfreq dt-bindings

On 22. 4. 12. 18:17, Krzysztof Kozlowski wrote:
> On 11/04/2022 14:10, Johnson Wang wrote:
>>> Also please put it in the "interconnect" directory.
>>>
>>
>> I don't really know about "interconnect".
>> However, it looks like a Linux framework about data transfer and "NoC".
>>
>> While this cci driver is more like a power managment which is
>> responsible for adjusting voltages and frequencies.
>> In my opinion, "devfreq" should be more suitable.
>>
>> Please correct me if my understanding is wrong.
> 
> devfreq is a Linux mechanism, not a real device/hardware. We try to put
> the bindings in directories/subsystems matching the hardware, therefore
> devfreq is not appropriate.
> 
> Whether interconnect - or other subsystem - is appropriate, I am not
> sure. To me this looks exactly like bus bandwidth management and you
> even use "interconnect" in several places. So interconnect matches.

I think that 'Documentation/devicetree/bindings/arm/mediatek' is proper.

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi