linux-kernel - Re: [PATCH v2 1/2] dt-bindings: memory-controllers: mtk-smi: Add support for mt8189

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Message-ID: <20251030164353.GA4119862-robh@kernel.org>
Date: Thu, 30 Oct 2025 11:43:53 -0500
From: Rob Herring <robh@...nel.org>
To: Zhengnan Chen <zhengnan.chen@...iatek.com>
Cc: Yong Wu <yong.wu@...iatek.com>, Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2 1/2] dt-bindings: memory-controllers: mtk-smi: Add
 support for mt8189

On Mon, Oct 27, 2025 at 08:14:27PM +0800, Zhengnan Chen wrote:
> Add binding description for mt8189.
> 
> The clocks number of mt8189 smi-sub common has a bit difference.
> Its clock count is 2, while mt8195 has 3. Therefore, the minimum
> number of clocks is changed to 2, with the third one being optional.
> 
> About what smi-sub-common is, please check the below diagram,
> we add it in mediatek,smi-common.yaml file.
> 
> Signed-off-by: Zhengnan Chen <zhengnan.chen@...iatek.com>
> ---
> Hi Angelo,
> We add a diagram in the smi-common yaml, We are not sure if you agree
> with this. thus I remove your R-b.
> 
> Thanks.
> ---
> ---
>  .../mediatek,smi-common.yaml                  | 25 +++++++++++++++++--
>  .../memory-controllers/mediatek,smi-larb.yaml |  3 +++
>  2 files changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> index 0762e0ff66ef..454d11a83973 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> +++ b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> @@ -25,6 +25,21 @@ description: |
>    SMI generation 1 to transform the smi clock into emi clock domain, but that is
>    not needed for SMI generation 2.
>  
> +  The smi-common connects with smi-larb and IOMMU. The maximum inputs number of
> +  a smi-common is 8. In SMI generation 2, the engines number may be over 8.
> +  In this case, we use a smi-sub-common to merge some larbs.
> +  The block diagram something is like:
> +
> +                          IOMMU
> +                           | |
> +                       smi-common
> +              ---------------------------
> +               |          |           ...
> +              larb0   sub-common      ...  <-max number is 8
> +                   ----------------
> +                    |     |    ...
> +                  larb1 larbX  ...  <-max number is 8
> +
>  properties:
>    compatible:
>      oneOf:
> @@ -40,6 +55,8 @@ properties:
>            - mediatek,mt8186-smi-common
>            - mediatek,mt8188-smi-common-vdo
>            - mediatek,mt8188-smi-common-vpp
> +          - mediatek,mt8189-smi-common
> +          - mediatek,mt8189-smi-sub-common
>            - mediatek,mt8192-smi-common
>            - mediatek,mt8195-smi-common-vdo
>            - mediatek,mt8195-smi-common-vpp
> @@ -108,19 +125,23 @@ allOf:
>          compatible:
>            contains:
>              enum:
> +              - mediatek,mt8189-smi-sub-common
>                - mediatek,mt8195-smi-sub-common
>      then:
>        required:
>          - mediatek,smi
>        properties:
>          clocks:
> -          minItems: 3
> +          minItems: 2

So now 2 clocks is valid for mt8195?

>            maxItems: 3
>          clock-names:
> +          minItems: 2
> +          maxItems: 3
>            items:
>              - const: apb
>              - const: smi
> -            - const: gals0
> +          additionalItems:
> +            const: gals0
>      else:
>        properties:
>          mediatek,smi: false
> diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.yaml
> index 2e7fac4b5094..9a5dafd7c07e 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.yaml
> +++ b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.yaml
> @@ -27,6 +27,7 @@ properties:
>            - mediatek,mt8183-smi-larb
>            - mediatek,mt8186-smi-larb
>            - mediatek,mt8188-smi-larb
> +          - mediatek,mt8189-smi-larb
>            - mediatek,mt8192-smi-larb
>            - mediatek,mt8195-smi-larb
>  
> @@ -85,6 +86,7 @@ allOf:
>              - mediatek,mt8183-smi-larb
>              - mediatek,mt8186-smi-larb
>              - mediatek,mt8188-smi-larb
> +            - mediatek,mt8189-smi-larb
>              - mediatek,mt8195-smi-larb
>  
>      then:
> @@ -119,6 +121,7 @@ allOf:
>                - mediatek,mt6779-smi-larb
>                - mediatek,mt8186-smi-larb
>                - mediatek,mt8188-smi-larb
> +              - mediatek,mt8189-smi-larb
>                - mediatek,mt8192-smi-larb
>                - mediatek,mt8195-smi-larb
>  
> -- 
> 2.46.0
>