linux-kernel - Re: [PATCHv1 7/8] arm64: dts: qcom: msm8998: Add PSCI cpuidle low power states

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Message-ID: <6b60656e-7786-1560-05f9-e2cbd6d1d18d@linaro.org>
Date:   Fri, 17 May 2019 18:11:00 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        bjorn.andersson@...aro.org, andy.gross@...aro.org,
        David Brown <david.brown@...aro.org>,
        Li Yang <leoyang.li@....com>, Shawn Guo <shawnguo@...nel.org>
Cc:     Marc Gonzalez <marc.w.gonzalez@...e.fr>, devicetree@...r.kernel.org
Subject: Re: [PATCHv1 7/8] arm64: dts: qcom: msm8998: Add PSCI cpuidle low
 power states

On 10/05/2019 13:29, Amit Kucheria wrote:
> Add device bindings for cpuidle states for cpu devices.
> 
> Cc: Marc Gonzalez <marc.w.gonzalez@...e.fr>
> Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
>  arch/arm64/boot/dts/qcom/msm8998.dtsi | 32 +++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi
> index 3fd0769fe648..208281f318e2 100644
> --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
> @@ -78,6 +78,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x0>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_PD>;
>  			efficiency = <1024>;
>  			next-level-cache = <&L2_0>;
>  			L2_0: l2-cache {
> @@ -97,6 +98,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x1>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_PD>;
>  			efficiency = <1024>;
>  			next-level-cache = <&L2_0>;
>  			L1_I_1: l1-icache {
> @@ -112,6 +114,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x2>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_PD>;
>  			efficiency = <1024>;
>  			next-level-cache = <&L2_0>;
>  			L1_I_2: l1-icache {
> @@ -127,6 +130,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x3>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_PD>;
>  			efficiency = <1024>;
>  			next-level-cache = <&L2_0>;
>  			L1_I_3: l1-icache {
> @@ -142,6 +146,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x100>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&BIG_CPU_PD>;
>  			efficiency = <1536>;
>  			next-level-cache = <&L2_1>;
>  			L2_1: l2-cache {
> @@ -161,6 +166,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x101>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&BIG_CPU_PD>;
>  			efficiency = <1536>;
>  			next-level-cache = <&L2_1>;
>  			L1_I_101: l1-icache {
> @@ -176,6 +182,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x102>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&BIG_CPU_PD>;
>  			efficiency = <1536>;
>  			next-level-cache = <&L2_1>;
>  			L1_I_102: l1-icache {
> @@ -191,6 +198,7 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x103>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&BIG_CPU_PD>;
>  			efficiency = <1536>;
>  			next-level-cache = <&L2_1>;
>  			L1_I_103: l1-icache {
> @@ -238,6 +246,30 @@
>  				};
>  			};
>  		};
> +
> +		idle-states {
> +			entry-method="psci";
> +
> +			LITTLE_CPU_PD: little-power-down {
> +				compatible = "arm,idle-state";
> +				idle-state-name = "little-power-down";
> +				arm,psci-suspend-param = <0x00000002>;
> +				entry-latency-us = <43>;
> +				exit-latency-us = <43>;
> +				min-residency-us = <200>;
> +				local-timer-stop;
> +			};
> +
> +			BIG_CPU_PD: big-power-down {
> +				compatible = "arm,idle-state";
> +				idle-state-name = "big-power-down";
> +				arm,psci-suspend-param = <0x00000002>;
> +				entry-latency-us = <41>;
> +				exit-latency-us = <41>;
> +				min-residency-us = <200>;
> +				local-timer-stop;
> +			};
> +		};
>  	};
>  
>  	firmware {
> 


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