linux-kernel - Re: [PATCH] arm64: dts: rockchip: Add optional GPU OPP voltage ranges to RK356x SoC dtsi

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Date: Sat, 29 Jun 2024 17:10:00 +0200
From: Heiko Stübner <heiko@...ech.de>
To: linux-rockchip@...ts.infradead.org, Dragan Simic <dsimic@...jaro.org>
Cc: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 linux-kernel@...r.kernel.org, Diederik de Haas <didi.debian@...ow.org>,
 Jonas Karlman <jonas@...boo.se>
Subject:
 Re: [PATCH] arm64: dts: rockchip: Add optional GPU OPP voltage ranges to
 RK356x SoC dtsi

Hi Dragan,

Am Samstag, 29. Juni 2024, 07:11:24 CEST schrieb Dragan Simic:

> +#ifndef RK356X_GPU_NPU_SHARED_REGULATOR

is there some reason for this duplicating of opps?

The regulator framework should pick the lowest supported voltage
anyway, so it seems you're just extending them upwards a bit.

So I really don't so why we'd need to sets here.

Also the voltage-range thing makes sense for non-gpu-npu-sharing
boards, when the supplying regulator does not fully support the
direct single-value voltage.

(rk3399-puma was such a case if I remember correctly)

So I really see no reason for this duplication.


Heiko

>  		opp-200000000 {
>  			opp-hz = /bits/ 64 <200000000>;
>  			opp-microvolt = <825000>;
> @@ -222,6 +229,37 @@ opp-800000000 {
>  			opp-hz = /bits/ 64 <800000000>;
>  			opp-microvolt = <1000000>;
>  		};
> +#else
> +		opp-200000000 {
> +			opp-hz = /bits/ 64 <200000000>;
> +			opp-microvolt = <825000 825000 1000000>;
> +		};
> +
> +		opp-300000000 {
> +			opp-hz = /bits/ 64 <300000000>;
> +			opp-microvolt = <825000 825000 1000000>;
> +		};
> +
> +		opp-400000000 {
> +			opp-hz = /bits/ 64 <400000000>;
> +			opp-microvolt = <825000 825000 1000000>;
> +		};
> +
> +		opp-600000000 {
> +			opp-hz = /bits/ 64 <600000000>;
> +			opp-microvolt = <825000 825000 1000000>;
> +		};
> +
> +		opp-700000000 {
> +			opp-hz = /bits/ 64 <700000000>;
> +			opp-microvolt = <900000 900000 1000000>;
> +		};
> +
> +		opp-800000000 {
> +			opp-hz = /bits/ 64 <800000000>;
> +			opp-microvolt = <1000000 1000000 1000000>;
> +		};
> +#endif /* RK356X_GPU_NPU_SHARED_REGULATOR */
>  	};
>  
>  	hdmi_sound: hdmi-sound {
>