linux-kernel - Re: [PATCH v11 01/12] dt-bindings: mediatek,dpi: Add DP

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Message-ID: <cf145ac2a053d6b84d70e24ae6c13dda37967fa4.camel@mediatek.com>
Date:   Thu, 16 Jun 2022 15:58:25 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <matthias.bgg@...il.com>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v11 01/12] dt-bindings: mediatek,dpi: Add DP_INTF
 compatible

On Tue, 2022-06-14 at 11:05 +0800, CK Hu wrote:
> Hi, Bo-Chen:
> 
> On Mon, 2022-06-13 at 14:48 +0800, Bo-Chen Chen wrote:
> > From: Markus Schneider-Pargmann <msp@...libre.com>
> > 
> > DP_INTF is similar to DPI but does not have the exact same feature
> > set
> > or register layouts.
> > 
> > DP_INTF is the sink of the display pipeline that is connected to
> > the
> > DisplayPort controller and encoder unit. It takes the same clocks
> > as
> > DPI.
> > 
> > In this patch, we also do these string replacement:
> > - s/mediatek/MediaTek/ in title.
> > - s/Mediatek/MediaTek/ in description.
> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> > ---
> >  .../bindings/display/mediatek/mediatek,dpi.yaml     | 13 ++++++++-
> > --
> > --
> >  1 file changed, 8 insertions(+), 5 deletions(-)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.y
> > am
> > l
> > b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.y
> > am
> > l
> > index 77ee1b923991..ca1b48e78581 100644
> > ---
> > a/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.y
> > am
> > l
> > +++
> > b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.y
> > am
> > l
> > @@ -4,16 +4,16 @@
> >  $id: 
> > http://devicetree.org/schemas/display/mediatek/mediatek,dpi.yaml#
> >  $schema: http://devicetree.org/meta-schemas/core.yaml#
> >  
> > -title: mediatek DPI Controller Device Tree Bindings
> > +title: MediaTek DPI and DP_INTF Controller
> >  
> >  maintainers:
> >    - CK Hu <ck.hu@...iatek.com>
> >    - Jitao shi <jitao.shi@...iatek.com>
> >  
> >  description: |
> > -  The Mediatek DPI function block is a sink of the display
> > subsystem
> > and
> > -  provides 8-bit RGB/YUV444 or 8/10/10-bit YUV422 pixel data on a
> > parallel
> > -  output bus.
> > +  The MediaTek DPI and DP_INTF function blocks are a sink of the
> > display
> > +  subsystem and provides 8-bit RGB/YUV444 or 8/10/10-bit YUV422
> > pixel data on a
> > +  parallel output bus.
> >  
> >  properties:
> >    compatible:
> > @@ -24,6 +24,7 @@ properties:
> >        - mediatek,mt8183-dpi
> >        - mediatek,mt8186-dpi
> >        - mediatek,mt8192-dpi
> > +      - mediatek,mt8195-dp_intf
> >  
> >    reg:
> >      maxItems: 1
> > @@ -36,12 +37,14 @@ properties:
> >        - description: Pixel Clock
> >        - description: Engine Clock
> >        - description: DPI PLL
> > +      - description: Clock gate for PLL
> 
> Why DP_INTF has this additional clock? What is the new hardware block
> (compared with DPI) need this clock? Why this is different than DPI?
> 
> Regards,
> CK
> 

Hello CK,

as previous reply, I will remove this clock.

BRs,
Bo-Chen

> >  
> >    clock-names:
> >      items:
> >        - const: pixel
> >        - const: engine
> >        - const: pll
> > +      - const: pll_gate
> >  
> >    pinctrl-0: true
> >    pinctrl-1: true
> > @@ -55,7 +58,7 @@ properties:
> >      $ref: /schemas/graph.yaml#/properties/port
> >      description:
> >        Output port node. This port should be connected to the input
> > port of an
> > -      attached HDMI or LVDS encoder chip.
> > +      attached HDMI, LVDS or DisplayPort encoder chip.
> >  
> >  required:
> >    - compatible
> 
>