linux-kernel - Re: [PATCH v2] dt-bindings: display: mediatek: split: add clocks count constraint for MT8195

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Message-ID: <0610bf4f130f238af148334969dfc0373cdb16de.camel@mediatek.com>
Date: Fri, 27 Sep 2024 09:01:08 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
	"tzimmermann@...e.de" <tzimmermann@...e.de>, "simona@...ll.ch"
	<simona@...ll.ch>, "mripard@...nel.org" <mripard@...nel.org>,
	Moudy Ho (何宗原) <Moudy.Ho@...iatek.com>,
	"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	"maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "robh@...nel.org"
	<robh@...nel.org>, Macpaul Lin (林智斌)
	<Macpaul.Lin@...iatek.com>, "airlied@...il.com" <airlied@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>
CC: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "moudy.ho@...iatek.corp-partner.google.com"
	<moudy.ho@...iatek.corp-partner.google.com>
Subject: Re: [PATCH v2] dt-bindings: display: mediatek: split: add clocks
 count constraint for MT8195

Hi, Moudy:

On Fri, 2024-09-27 at 13:51 +0800, Moudy Ho wrote:
> From: Moudy Ho <moudy.ho@...iatek.corp-partner.google.com>
> 
> The display node in mt8195.dtsi was triggering a CHECK_DTBS error due
> to an excessively long 'clocks' property:
>   display@...06000: clocks: [[31, 14], [31, 43], [31, 44]] is too long
> 
> To resolve this issue, apply the limit by setting 'maxItems: 3' in MT8195
> additional condition.

I think the main purpose of this patch is not to add limitation.
The main purpose is that you add HDMI RX Clock and HDMI Metadata Clock.
Could you describe more about these two clock?
mt8173-disp-split could work without these two clocks. Why mt8195-mdp3-split need these two clocks?

> 
> Fixes: 4ed545e7d100 ("dt-bindings: display: mediatek: disp: split each block to individual yaml")

The fixes patch should be 739058a9c5c3 ("dt-bindings: display: mediatek: split: add compatible for MT8195")

Regards,
CK

> Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
> Signed-off-by: Moudy Ho <moudy.ho@...iatek.com>
> --
> The purpose of this patch is to separate the corrections for
> MediaTek SPLIT CHECK_DTBS error from the original mailing list
> mentioned below:
> https://lore.kernel.org/all/20240924103156.13119-2-macpaul.lin@mediatek.com/
> 
> Changes since v1:
>   - Adding functional descriptions and quantity restrictions.
> ---
>  .../bindings/display/mediatek/mediatek,split.yaml           | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml
> index e4affc854f3d..bce1b8b866ce 100644
> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml
> @@ -57,6 +57,9 @@ properties:
>    clocks:
>      items:
>        - description: SPLIT Clock
> +      - description: HDMI RX Clock
> +      - description: HDMI Metadata Clock
> +    minItems: 1
>  
>  required:
>    - compatible
> @@ -72,6 +75,9 @@ allOf:
>              const: mediatek,mt8195-mdp3-split
>  
>      then:
> +      properties:
> +        clocks:
> +          maxItems: 3
>        required:
>          - mediatek,gce-client-reg
>