linux-kernel - Re: [PATCH 1/3] dt-bindings: mtk-jpeg: Add binding for MT8195 JPG

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Date:   Mon, 5 Jul 2021 16:09:18 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     "kyrie.wu" <kyrie.wu@...iatek.com>
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Rick Chang <rick.chang@...iatek.com>,
        Bin Liu <bin.liu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Tomasz Figa <tfiga@...omium.org>, xia.jiang@...iatek.com,
        maoguang.meng@...iatek.com, srv_heupstream@...iatek.com
Subject: Re: [PATCH 1/3] dt-bindings: mtk-jpeg: Add binding for MT8195 JPG

On Wed, Jun 30, 2021 at 3:56 PM kyrie.wu <kyrie.wu@...iatek.com> wrote:
> Mt8195 has two hardwares, "mediatek,mt8195-jpgenc0" for hw0 and
> "mediatek,mt8195-jpgenc1" for HW1. These two nodes will register
> hardware interrupt, initialize clock, power domain, remap register base
> addr and other operations. But the device node is not registered.
> "mediatek,mt8195-jpgenc" will register the device node to represent jpeg
> encode device. Then the component framework is used to manage the above
> two hardwares.
Please don't top-posting.  Inline your replies so that people can
easily follow the discussion.

I still don't quite understand why it needs to introduce 2 compatible
strings.  If hw0 and hw1 are different from interrupts, clocks, power
domain, and etc, couldn't you use the same compatible string (e.g.
"mt8195-jpgenc") and provide them different DT attributes?

> On Fri, 2021-06-25 at 17:18 +0800, Tzung-Bi Shih wrote:
> > On Wed, Jun 23, 2021 at 2:06 PM kyrie.wu <kyrie.wu@...iatek.com> wrote:
> > >  Documentation/devicetree/bindings/media/mediatek-jpeg-encoder.txt | 3 +++
> > >  1 file changed, 3 insertions(+)
> > Note: the patch won't apply after [1].
> >
> > [1]: https://lore.kernel.org/patchwork/patch/1445298/
> >
> > >  Required properties:
> > >  - compatible : "mediatek,mt2701-jpgenc"
> > > +- compatible : "mediatek,mt8195-jpgenc"
> > > +- compatible : "mediatek,mt8195-jpgenc0"
> > > +- compatible : "mediatek,mt8195-jpgenc1"
> > Why it needs 3 compatible strings?