linux-kernel - Re: [PATCH] arm64: dts: mediatek: Add smi

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Message-ID: <d937daf7-469f-8d74-4267-057b89cf1dd1@gmail.com>
Date:   Fri, 2 Oct 2020 11:17:47 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-kernel@...r.kernel.org
Cc:     Collabora Kernel ML <kernel@...labora.com>, weiyi.lu@...iatek.com,
        drinkcat@...omium.org, hsinyi@...omium.org, fparent@...libre.com,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] arm64: dts: mediatek: Add smi_common node for MT8183



On 01/10/2020 18:28, Enric Balletbo i Serra wrote:
> The SMI (Smart Multimedia Interface) Common is a bridge between the m4u
> (Multimedia Memory Management Unit) and the Multimedia HW. This block is
> needed to support different multimedia features, like display, video
> decode, and camera. Also is needed to control the power domains of such
> HW blocks.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> 
>   arch/arm64/boot/dts/mediatek/mt8183.dtsi | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183.dtsi b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> index c2fd141afcf6..9082bc65e15e 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> @@ -916,6 +916,16 @@ mmsys: syscon@...00000 {
>   			#clock-cells = <1>;
>   		};
>   
> +		smi_common: smi@...19000 {
> +			compatible = "mediatek,mt8183-smi-common", "syscon";
> +			reg = <0 0x14019000 0 0x1000>;
> +			clocks = <&mmsys CLK_MM_SMI_COMMON>,
> +				 <&mmsys CLK_MM_SMI_COMMON>,
> +				 <&mmsys CLK_MM_GALS_COMM0>,
> +				 <&mmsys CLK_MM_GALS_COMM1>;
> +			clock-names = "apb", "smi", "gals0", "gals1";
> +		};
> +

Having a look at the bindings description, it states that the power-domains 
phandle is a required property.
So I suppose you have to base this on the power domains series.

Regards,
Matthias

>   		imgsys: syscon@...20000 {
>   			compatible = "mediatek,mt8183-imgsys", "syscon";
>   			reg = <0 0x15020000 0 0x1000>;
>