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

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Date:   Tue, 14 Jun 2022 11:05:47 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bo-Chen Chen <rex-bc.chen@...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

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.yam
> l
> b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yam
> l
> index 77ee1b923991..ca1b48e78581 100644
> ---
> a/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yam
> l
> +++
> b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yam
> 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

>  
>    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