linux-kernel - Re: [PATCH v2 4/7] arm64: dts: allwinner: h6: Add GPU Operating Performance Points table

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Date:   Mon, 6 Apr 2020 10:16:01 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v2 4/7] arm64: dts: allwinner: h6: Add GPU Operating
 Performance Points table

On Sun, Apr 05, 2020 at 07:35:58PM +0200, Clément Péron wrote:
> Add an Operating Performance Points table for the GPU to
> enable Dynamic Voltage & Frequency Scaling on the H6.
>
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  .../boot/dts/allwinner/sun50i-h6-gpu-opp.dtsi | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-h6-gpu-opp.dtsi
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-gpu-opp.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6-gpu-opp.dtsi
> new file mode 100644
> index 000000000000..4a1814844fe0
> --- /dev/null
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-gpu-opp.dtsi
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +// Copyright (C) 2020 Clément Péron <peron.clem@...il.com>
> +
> +/ {
> +	gpu_opp_table: opp_table1 {

A node name is supposed to be a generic description, so what about
using gpu-opp-table (and cpu-opp-table) instead?

> +		compatible = "operating-points-v2";
> +
> +		opp@...000000 {
> +			opp-hz = /bits/ 64 <756000000>;
> +			opp-microvolt = <1040000>;
> +		};
> +		opp@...000000 {
> +			opp-hz = /bits/ 64 <624000000>;
> +			opp-microvolt = <950000>;
> +		};

Ordering by ascending frequency would be great here.

Also, why did you need to create a new DTSI for it? Is there some
downside to enabling it for all the users?

Maxime

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