linux-kernel - Re: [PATCH v2] arm64: dts: mt8192: Add vcodec lat and core nodes

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Message-ID: <172e10ee-22fd-ccec-1a5a-7bd0a29dbfc4@linaro.org>
Date:   Wed, 28 Sep 2022 09:04:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Allen-KH Cheng (程冠勳) 
        <Allen-KH.Cheng@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: mt8192: Add vcodec lat and core nodes

On 27/09/2022 12:17, AngeloGioacchino Del Regno wrote:
>>>
>>
>> Sorry, my bad. I alsways run `make dtbs_check` to confirm dtb with
>> bindings. I just think we didn't limit node names in mtk-vodec
>> bindings. I will pay attention next time.
>>
>>
>> Since currently the vcodec lat and core nodes are absent from the mtk
>> dts, do you think the child node name should be changed to something
>> more general (ex: video-codec) in mediatek,vcodec-subdev-decoder
>> bindings?
> 
> The video codec is mt8192-vcodec-dec, while the other nodes are describing
> the VPU instances (and/or vpu cores)... I'm not sure.
> 
> Krzysztof, please, can you give your opinion on that?
> 

What's the difference between them? I understand parent device is entire
block of consisting of multiple processing units? If so, video-codec
actually could fit in both places. But feel free to call it a bit
different (video-codec-core, video-codec-lat, processing-unit, even
something less generic). Sometimes it's tricky to find nice name, so I
wouldn't worry too much in that case. Just not "mt8192-vcodec" :)

Best regards,
Krzysztof