linux-kernel - Re: [PATCH] dt-bindings: arm: mediatek: mmsys: refine power and gce properties

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Date:   Fri, 29 Apr 2022 07:55:37 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jason-JH Lin <jason-jh.lin@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Fabien Parent <fparent@...libre.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, CK Hu <ck.hu@...iatek.com>,
        Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH] dt-bindings: arm: mediatek: mmsys: refine power and gce
 properties

On 29/04/2022 06:10, Jason-JH Lin wrote:
> Yes, we cannot have infinite number for this, but we can use not only
> one mbox channel for one mmsys.
> 
> Its maximum number is equal to GCE HW thread number.
> The maximum number in mt8195 is 24 and mt8173 is 16.
> 
> But we currently using 1.
> So I'm not sure if I need to set the maxItems for this?

Yes. 24 for mt8195 and 16 for mt8173.

> 
>>
>>>      description:
>>> -      Using mailbox to communicate with GCE, it should have this
>>> -      property and list of phandle, mailbox specifiers. See
>>> -      Documentation/devicetree/bindings/mailbox/mtk-gce.txt for
>>> details.
>>> -    $ref: /schemas/types.yaml#/definitions/phandle-array
>>> +      If using mailbox to communicate with GCE, it should have
>>> this
>>> +      property. GCE will help configure the hardware settings for
>>> the
>>> +      current mmsys data pipeline.
>>>  
>>>    mediatek,gce-client-reg:
>>> -    description:
>>> -      The register of client driver can be configured by gce with
>>> 4 arguments
>>> -      defined in this property, such as phandle of gce, subsys id,
>>> -      register offset and size.
>>> -      Each subsys id is mapping to a base address of display
>>> function blocks
>>> -      register which is defined in the gce header
>>> -      include/dt-bindings/gce/<chip>-gce.h.
>>> -    $ref: /schemas/types.yaml#/definitions/phandle-array
>>
>> Why removing ref? Does your binding work after such change?
> 
> I removed it unexpectedly, I'll add it back.

Just be sure you test it before submitting...


Best regards,
Krzysztof