linux-kernel - Re: [PATCH v5 12/12] arm64: dts: mediatek: mt8195: Add SCP 2nd core

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Date:   Fri, 10 Feb 2023 15:09:28 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Tinghan Shen <tinghan.shen@...iatek.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v5 12/12] arm64: dts: mediatek: mt8195: Add SCP 2nd core

Il 10/02/23 09:59, Tinghan Shen ha scritto:
> Rewrite the MT8195 SCP device node as a cluster and
> add the SCP 2nd core in it.
> 
> Since the SCP device node is changed to multi-core structure,
> enable SCP cluster to enable probing SCP core 0.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> ---
>   .../boot/dts/mediatek/mt8195-cherry.dtsi      |  4 +++
>   arch/arm64/boot/dts/mediatek/mt8195.dtsi      | 30 ++++++++++++++-----
>   2 files changed, 27 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> index 56749cfe7c33..4f9bc7581adb 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> @@ -933,6 +933,10 @@
>   	interrupts-extended = <&pio 222 IRQ_TYPE_LEVEL_HIGH>;
>   };
>   
> +&scp_cluster {
> +	status = "okay";
> +};
> +
>   &scp {
>   	status = "okay";
>   
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> index 8f1264d5290b..87e49f5fb7b3 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> @@ -826,14 +826,30 @@
>   			clocks = <&infracfg_ao CLK_INFRA_AO_GCE2>;
>   		};
>   
> -		scp: scp@...00000 {
> -			compatible = "mediatek,mt8195-scp";
> -			reg = <0 0x10500000 0 0x100000>,
> -			      <0 0x10720000 0 0xe0000>,
> -			      <0 0x10700000 0 0x8000>;
> -			reg-names = "sram", "cfg", "l1tcm";
> -			interrupts = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
> +		scp_cluster: scp@...00000 {
> +			compatible = "mediatek,mt8195-scp-dual";
> +			reg = <0 0x10720000 0 0xe0000>, <0 0x10700000 0 0x8000>;
> +			reg-names = "cfg", "l1tcm";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges = <0 0 0x10500000 0x100000>;
>   			status = "disabled";
> +
> +			scp: scp@0 {

Minor nit: Please change this to `scp_c0:`.
Like that, we keep consistency and increase readability, as we're clearly then
reading that one node is for core 0, the other is for core 1.

This is fine even on devices using only a single SCP core, because in devicetree
we are describing the hardware, not the software implemetation of it - and the
MT8195 SoC does, by hardware, have two SCP cores anyway :-)

After which,

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>