linux-kernel - Re: [PATCHv1 5/8] arm64: dts: qcom: qcs404: Add PSCI cpuidle low power states

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Date:   Tue, 14 May 2019 18:12:35 +0200
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     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>,
        devicetree@...r.kernel.org
Subject: Re: [PATCHv1 5/8] arm64: dts: qcom: qcs404: Add PSCI cpuidle low
 power states

On Fri, May 10, 2019 at 04:59:43PM +0530, Amit Kucheria wrote:
> From: Niklas Cassel <niklas.cassel@...aro.org>
> 
> Add device bindings for cpuidle states for cpu devices.
> 
> [amit: rename the idle-states to more generic names and fixups]
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@...aro.org>
> Reviewed-by: Vinod Koul <vkoul@...nel.org>
> Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/qcs404.dtsi | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcs404.dtsi b/arch/arm64/boot/dts/qcom/qcs404.dtsi
> index e8fd26633d57..369c59c35bc7 100644
> --- a/arch/arm64/boot/dts/qcom/qcs404.dtsi
> +++ b/arch/arm64/boot/dts/qcom/qcs404.dtsi
> @@ -30,6 +30,7 @@
>  			compatible = "arm,cortex-a53";
>  			reg = <0x100>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0>;
>  			next-level-cache = <&L2_0>;
>  		};
>  
> @@ -38,6 +39,7 @@
>  			compatible = "arm,cortex-a53";
>  			reg = <0x101>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0>;
>  			next-level-cache = <&L2_0>;
>  		};
>  
> @@ -46,6 +48,7 @@
>  			compatible = "arm,cortex-a53";
>  			reg = <0x102>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0>;
>  			next-level-cache = <&L2_0>;
>  		};
>  
> @@ -54,6 +57,7 @@
>  			compatible = "arm,cortex-a53";
>  			reg = <0x103>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0>;
>  			next-level-cache = <&L2_0>;
>  		};
>  
> @@ -61,6 +65,20 @@
>  			compatible = "cache";
>  			cache-level = <2>;
>  		};
> +
> +		idle-states {
> +			entry-method="psci";

Please add a space before and after "=".

> +
> +			CPU_SLEEP_0: cpu-sleep-0 {

Regarding CPU_SLEEP_0 vs CPU_PC, see my comment on patch 4/8.

> +				compatible = "arm,idle-state";
> +				idle-state-name = "standalone-power-collapse";
> +				arm,psci-suspend-param = <0x40000003>;
> +				entry-latency-us = <125>;
> +				exit-latency-us = <180>;
> +				min-residency-us = <595>;
> +				local-timer-stop;
> +			};
> +		};
>  	};
>  
>  	firmware {
> -- 
> 2.17.1
>