Re: [PATCH] dt-bindings: arm: mediatek: mmsys: change compatible for MT8195

[Matthias Brugger <matthias.bgg@gmail.com>]

On 25/08/2022 08:59, Bo-Chen Chen wrote:
> On Thu, 2022-08-25 at 14:11 +0800, Krzysztof Kozlowski wrote:
>> On 25/08/2022 08:56, Bo-Chen Chen wrote:
>>> From: "Jason-JH.Lin" <jason-jh.lin@mediatek.com>
>>>
>>> For previous MediaTek SoCs, such as MT8173, there are 2 display HW
>>> pipelines binding to 1 mmsys with the same power domain, the same
>>> clock driver and the same mediatek-drm driver.
>>>
>>> For MT8195, VDOSYS0 and VDOSYS1 are 2 display HW pipelines binding
>>> to
>>> 2 different power domains, different clock drivers and different
>>> mediatek-drm drivers.

drop clock driver example here.

>>
>> I don't see binding to different clock drivers and anyway that's not
>> really an argument here. Please focus in description on hardware
>> properties, IOW, are devices compatible or different. What is the
>> incompatible difference between VDOSYS0 and 1?
>>
>> Best regards,
>> Krzysztof
> 
> Hello Krzysztof,
> 
> Thanks for yor review.
> 
>  From the functions perspective:
> 
> Hardware pipeline of VDOSYS0 has these components: COLOR, CCORR, AAL,
> GAMMA, DITHER.
> They are related to PQ (Picture Quality) functions and they makes
> VDOSYS0 supports PQ function while they are not including in VDOSYS1.
> 
> Hardware pipeline of VDOSYS1 has the component ETHDR (HDR related
> component).
> It makes VDOSYS1 supports the HDR function while it's not including in
> VDOSYS0.
> 

Please include a description of this in the commit message.

> About mediatek ETHDR, you can refer to this series:
> 
> https://lore.kernel.org/all/20220819061456.8042-2-nancy.lin@mediatek.com/
> 
> To summary:
> Only VDOSYS0 can support PQ adjustment.
> Only VDOSYS1 can support HDR adjustment.
> 
> Is this description ok for you?
> If it is ok, I will put them into commit message in next version.
> 
> BRs,
> Bo-Chen
>