linux-kernel - Re: [RFC PATCH 2/2] riscv: dts: allwinner: Fill in OPPs

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Date: Wed, 20 Dec 2023 16:25:50 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: 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>, Samuel Holland <samuel@...lland.org>,
 Yangtao Li <tiny.windzz@...il.com>, "Rafael J . Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>,
 Brandon Cheo Fusi <fusibrandon13@...il.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
 Brandon Cheo Fusi <fusibrandon13@...il.com>
Subject: Re: [RFC PATCH 2/2] riscv: dts: allwinner: Fill in OPPs

Dne sreda, 20. december 2023 ob 10:51:41 CET je Brandon Cheo Fusi napisal(a):
> Specifies two voltage ranges, in order of increasing stability,
> for each OPP. This is heavily inspired by
> 
> https://github.com/Tina-Linux/linux-5.4/blob/master/arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi#L118-L133
> 
> and
> 
> https://github.com/mangopi-sbc/tina-linux-5.4/blob/0d4903ebd9d2194ad914686d5b0fc1ddacf11a9d/arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi#L118-L182

Remove links from message. If you really want them, add Link tag for each.

> 
> Signed-off-by: Brandon Cheo Fusi <fusibrandon13@...il.com>
> ---
>  arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> index 2f1771c19..8e7bc8bd0 100644
> --- a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> @@ -48,13 +48,17 @@ opp_table_cpu: opp-table-cpu {
>  		opp-408000000 {
>  			clock-latency-ns = <244144>; /* 8 32k periods */
>  			opp-hz = /bits/ 64 <408000000>;
> -			opp-microvolt-speed0 = <900000 900000 1100000>;
> +
> +			opp-microvolt-speed0 = <950000 900000 1100000>;

Second value should be same as first, otherwise you'll experience stability issue.

> +			opp-microvolt-speed1 = <900000 900000 1100000>;
>  		};
>  
>  		opp-1080000000 {
>  			clock-latency-ns = <244144>; /* 8 32k periods */
>  			opp-hz = /bits/ 64 <1008000000>;
> -			opp-microvolt-speed0 = <900000 900000 1100000>;
> +
> +			opp-microvolt-speed0 = <1100000 900000 1100000>;

Ditto.

Best regards,
Jernej

> +			opp-microvolt-speed1 = <950000 900000 1100000>;
>  		};
>  	};
>  
>