linux-kernel - Re: [PATCH 3/6] arm64: dts: mediatek: mt8188: Define CPU big core cluster

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Message-ID: <fbdbe9ff-586a-429c-a987-b8ec39b485e8@collabora.com>
Date: Thu, 26 Sep 2024 10:33:38 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Fei Shao <fshao@...omium.org>
Cc: Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>, Rob Herring <robh@...nel.org>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/6] arm64: dts: mediatek: mt8188: Define CPU big core
 cluster

Il 25/09/24 12:57, Fei Shao ha scritto:
> The MT8188 SoC features two CPU clusters: one with 6 little Cortex-A55
> cores, and the other with 2 big Cortex-A78 cores.

No, it doesn't. It features only one cluster, so...

> 
> Update the CPU topology to reflect the actual hardware configurations.

...the actual hardware configuration is already reflected by the currently
declared CPU topology, so for this commit: NAK.

This SoC uses the ARM DynamIQ technology and embeds both LITTLE and big
cores in one single cluster.
Check the MT8188 datasheet for more information :-)

Cheers,
Angelo

> 
> Signed-off-by: Fei Shao <fshao@...omium.org>
> ---
> 
>   arch/arm64/boot/dts/mediatek/mt8188.dtsi | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8188.dtsi b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
> index cd27966d2e3c..51bf08b2ff9b 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8188.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
> @@ -195,12 +195,14 @@ core4 {
>   				core5 {
>   					cpu = <&cpu5>;
>   				};
> +			};
>   
> -				core6 {
> +			cluster1 {
> +				core0 {
>   					cpu = <&cpu6>;
>   				};
>   
> -				core7 {
> +				core1 {
>   					cpu = <&cpu7>;
>   				};
>   			};