linux-kernel - Re: [RFC PATCH v3 3/3] riscv: dts: allwinner: Fill in OPPs

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Message-ID: <20231226053647.kvrpn4pjtc2lhfcm@vireshk-i7>
Date: Tue, 26 Dec 2023 11:06:47 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Brandon Cheo Fusi <fusibrandon13@...il.com>
Cc: Andre Przywara <andre.przywara@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Yangtao Li <tiny.windzz@...il.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>, devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH v3 3/3] riscv: dts: allwinner: Fill in OPPs

On 22-12-23, 12:14, Brandon Cheo Fusi wrote:
> Specify two voltage ranges, in order of increasing stability,
> for each OPP.
> 
> Also define an nvmem cpu speed grade cell of length 2.
> 
> Link: https://github.com/Tina-Linux/linux-5.4/blob/master/arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi#L118-L133
> Link: https://github.com/mangopi-sbc/tina-linux-5.4/blob/0d4903ebd9d2194ad914686d5b0fc1ddacf11a9d/arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi#L118-L182
> 
> Signed-off-by: Brandon Cheo Fusi <fusibrandon13@...il.com>
> ---
>  arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> index 64c3c2e6c..7e2e015e0 100644
> --- a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> @@ -39,16 +39,23 @@ cpu0_intc: interrupt-controller {
>  	};
>  
>  	opp_table_cpu: opp-table-cpu {
> -		compatible = "operating-points-v2";
> +		compatible = "allwinner,sun20i-d1-operating-points";
> +		nvmem-cells = <&cpu_speed_grade>;
> +		nvmem-cell-names = "speed";
> +		opp-shared;
>  
>  		opp-408000000 {
>  			opp-hz = /bits/ 64 <408000000>;
> -			opp-microvolt = <900000 900000 1100000>;
> +
> +			opp-microvolt-speed0 = <950000 950000 1100000>;
> +			opp-microvolt-speed1 = <900000 900000 1100000>;
>  		};
>  
>  		opp-1080000000 {
>  			opp-hz = /bits/ 64 <1008000000>;
> -			opp-microvolt = <900000 900000 1100000>;
> +
> +			opp-microvolt-speed0 = <1100000>;

I was expecting the above two lines to have same values. Why change
them ?

> +			opp-microvolt-speed1 = <950000 950000 1100000>;
>  		};
>  	};
>  
> @@ -115,3 +122,9 @@ pmu {
>  			<0x00000000 0x0000000f 0xffffffff 0xffffffff 0x00020000>;
>  	};
>  };
> +
> +&sid {
> +	cpu_speed_grade: cpu-speed-grade@0 {
> +		reg = <0x00 0x2>;
> +	};
> +};
> -- 
> 2.30.2

-- 
viresh