linux-kernel - Re: [PATCH v2] soc: mediatek: Add deprecated compatible to mmsys

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Date:   Fri, 16 Dec 2022 21:53:40 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, matthias.bgg@...nel.org,
        nancy.lin@...iatek.com, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] soc: mediatek: Add deprecated compatible to mmsys

On Fri, Dec 16, 2022 at 9:33 PM Matthias Brugger <matthias.bgg@...il.com> wrote:
>
>
>
> On 01/12/2022 12:20, Chen-Yu Tsai wrote:
> > On Mon, Nov 14, 2022 at 7:59 PM AngeloGioacchino Del Regno
> > <angelogioacchino.delregno@...labora.com> wrote:
> >>
> >> Il 11/11/22 09:29, matthias.bgg@...nel.org ha scritto:
> >>> From: Matthias Brugger <matthias.bgg@...il.com>
> >>>
> >>> For backward compatibility we add the deprecated compatible.
> >>>
> >>> Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
> >>
> >> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> >>
> >> ...And tested on MT8195 Cherry Chromebook.
> >
> > This now seems like a bad idea. In the dtsi we have two nodes (vdosys0 and
> > vdosys1) that both currently use the -mmsys compatible, which in the driver
> > maps to vdosys0. So not only do we have vdosys1 incorrectly probing as
> > vdosys0, we also have duplicate clks being registered and duplicate DRM
> > pipelines. On my device vdosys1 ends up winning the duplicate clock race.
> >
>
> That's true, we should fix the DTS deleting vdosys1 node as it's not
> implemented. While at it we should also fix the compatible for vdosys0 as
> "mediatek,mt8195-mmsys" is now deprecated.
>
> Would you mind to send a patch?

I'll be going on vacation shortly, and will be back after Christmas.

Reading the above, I assume you want two patches? One to drop the deprecated
compatible, and another to delete the vdosys1 node? And both should be
tag with fixes and backported?

I can take care of it after I get back. If someone wants to beat me to it,
feel free to do it.


ChenYu