linux-kernel - Re: [PATCH v1 15/17] dt-bindings: display: mediatek: dpi: Add compatible for MediaTek MT8195

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Message-ID: <CAGXv+5FYjj6=WHWBvNRDmpw2Ux8RJ4a2fT1gXk3+eXSqt9poeQ@mail.gmail.com>
Date:   Mon, 26 Sep 2022 13:24:20 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Guillaume Ranquet <granquet@...libre.com>,
        Vinod Koul <vkoul@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>, Jitao shi <jitao.shi@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        devicetree@...r.kernel.org,
        Mattijs Korpershoek <mkorpershoek@...libre.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-clk@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-phy@...ts.infradead.org, Pablo Sun <pablo.sun@...iatek.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 15/17] dt-bindings: display: mediatek: dpi: Add
 compatible for MediaTek MT8195

On Thu, Sep 22, 2022 at 3:20 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 19/09/2022 18:56, Guillaume Ranquet wrote:
> > Add dt-binding documentation of dpi for MediaTek MT8195 SoC.
> >
> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> >
> > diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml
> > index 5bb23e97cf33..2c7ecef54986 100644
> > --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml
> > +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml
> > @@ -24,6 +24,7 @@ properties:
> >        - mediatek,mt8183-dpi
> >        - mediatek,mt8186-dpi
> >        - mediatek,mt8192-dpi
> > +      - mediatek,mt8195-dpi
> >        - mediatek,mt8195-dp-intf
>
> Aren't these the same?

*-dpi are MIPI DPI (as in parallel data with DDR modes) encoders.
*-dp-intf are Display Port encoder.

Totally distinguishable. :)

The hardware blocks seem similar upon cursory comparison of the register
tables, with the base layout being the same, and sharing registers for
basic settings such as the display timings.

The DPI ones have some extra registers, presumably to control the signals
or output width. The DP one has some registers of its own that only make
sense for Display Port.


ChenYu