linux-kernel - Re: [PATCH] arm64: dts: meson-g12b-odroid-n2*: Add support for overclocking Hardkernel ODROID-N2 boards.

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Date: Thu, 22 Feb 2024 10:37:28 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Adam Green <greena88@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>, Kevin Hilman
 <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, Martin
 Blumenstingl <martin.blumenstingl@...glemail.com>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: meson-g12b-odroid-n2*: Add support for
 overclocking Hardkernel ODROID-N2 boards.


On Thu 22 Feb 2024 at 08:25, Adam Green <greena88@...il.com> wrote:

> Hardkernel actively supports overclocking these boards in their own
> documentation. (https://wiki.odroid.com/odroid-n2/hardware/overclocking)
>
> This aligns the SoC opps with those in the board vendors bsp source.

Patch title is too long - checkpatch.pl should have given a you warning
for this.

Not sure it is wise support overclocking directly in mainline, not by
default at least. Maybe as an overlay ? even this I'm not too sure.

>
> Signed-off-by: Adam Green <greena88@...il.com>
> ---
>  .../dts/amlogic/meson-g12b-odroid-n2-plus.dts | 25 +++++++++++++++++++
>  .../boot/dts/amlogic/meson-g12b-odroid-n2.dts | 17 +++++++++++++
>  .../dts/amlogic/meson-g12b-odroid-n2l.dts     | 25 +++++++++++++++++++
>  3 files changed, 67 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts
> index ce1198ad34e4..1731d542a00c 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2-plus.dts
> @@ -15,6 +15,31 @@ / {
>  	model = "Hardkernel ODROID-N2Plus";
>  };
>  
> +&cpu_opp_table_0 {
> +	opp-1908000000 {
> +		opp-hz = /bits/ 64 <1908000000>;
> +		opp-microvolt = <1030000>;
> +	};
> +	opp-2016000000 {
> +		opp-hz = /bits/ 64 <2016000000>;
> +		opp-microvolt = <1040000>;
> +		turbo-mode;
> +	};
> +};
> +
> +&cpub_opp_table_1 {
> +	opp-2304000000 {
> +		opp-hz = /bits/ 64 <2304000000>;
> +		opp-microvolt = <1030000>;
> +		turbo-mode;
> +	};
> +	opp-2400000000 {
> +		opp-hz = /bits/ 64 <2400000000>;
> +		opp-microvolt = <1040000>;
> +		turbo-mode;
> +	};
> +};
> +
>  &vddcpu_a {
>  	regulator-min-microvolt = <680000>;
>  	regulator-max-microvolt = <1040000>;
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> index a198a91259ec..0c71e8bc0124 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> @@ -13,3 +13,20 @@ / {
>  	compatible = "hardkernel,odroid-n2", "amlogic,s922x", "amlogic,g12b";
>  	model = "Hardkernel ODROID-N2";
>  };
> +
> +&cpu_opp_table_0 {
> +	opp-1992000000 {
> +		turbo-mode;
> +	};
> +};
> +
> +&cpub_opp_table_1 {
> +	opp-1908000000 {
> +		turbo-mode;
> +	};
> +	opp-2004000000 {
> +		opp-hz = /bits/ 64 <2004000000>;
> +		opp-microvolt = <1022000>;
> +		turbo-mode;
> +	};
> +};
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2l.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2l.dts
> index e26f3e3258e1..b16a69d0cad6 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2l.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2l.dts
> @@ -97,6 +97,31 @@ codec {
>  	};
>  };
>  
> +&cpu_opp_table_0 {
> +	opp-1908000000 {
> +		opp-hz = /bits/ 64 <1908000000>;
> +		opp-microvolt = <1030000>;
> +	};
> +	opp-2016000000 {
> +		opp-hz = /bits/ 64 <2016000000>;
> +		opp-microvolt = <1040000>;
> +		turbo-mode;
> +	};
> +};
> +
> +&cpub_opp_table_1 {
> +	opp-2304000000 {
> +		opp-hz = /bits/ 64 <2304000000>;
> +		opp-microvolt = <1030000>;
> +		turbo-mode;
> +	};
> +	opp-2400000000 {
> +		opp-hz = /bits/ 64 <2400000000>;
> +		opp-microvolt = <1040000>;
> +		turbo-mode;
> +	};
> +};
> +
>  &eth_phy {
>  	status = "disabled";
>  };


-- 
Jerome