linux-kernel - Re: [PATCH v2 13/14] [DO NOT MERGE] arm64: dts: allwinner: h6: Add GPU OPP table

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Date:   Sat, 4 Jul 2020 14:13:01 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 13/14] [DO NOT MERGE] arm64: dts: allwinner: h6: Add
 GPU OPP table

Hi,

On Sat, Jul 04, 2020 at 12:25:34PM +0200, Clément Péron wrote:
> Add an Operating Performance Points table for the GPU to
> enable Dynamic Voltage & Frequency Scaling on the H6.
> 
> The voltage range is set with minival voltage set to the target
> and the maximal voltage set to 1.2V. This allow DVFS framework to
> work properly on board with fixed regulator.
> 
> Signed-off-by: Clément Péron <peron.clem@...il.com>

That patch seems reasonable, why shouldn't we merge it?

> ---
>  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 80 ++++++++++++++++++++
>  1 file changed, 80 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> index 8f514a2169aa..a69f9e09a829 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> @@ -174,6 +174,7 @@ gpu: gpu@...0000 {
>  			clocks = <&ccu CLK_GPU>, <&ccu CLK_BUS_GPU>;
>  			clock-names = "core", "bus";
>  			resets = <&ccu RST_BUS_GPU>;
> +			operating-points-v2 = <&gpu_opp_table>;
>  			#cooling-cells = <2>;
>  			status = "disabled";
>  		};
> @@ -1036,4 +1037,83 @@ map0 {
>  			};
>  		};
>  	};
> +
> +	gpu_opp_table: gpu-opp-table {
> +		compatible = "operating-points-v2";
> +
> +		opp@...000000 {
> +			opp-hz = /bits/ 64 <216000000>;
> +			opp-microvolt = <810000 810000 1200000>;
> +		};

All those nodes will create DTC warnings though.

Maxime