Subject: [PATCH v3] arm64: dts: juno: Add idle-states to device tree

From: [email-masked] (Lorenzo Pieralisi)
Date: Wed, 9 Dec 2015 15:19:45 +0000

[CC'ed Arnd, Olof and Kevin]

On Wed, Dec 09, 2015 at 09:40:53AM +0000, Jon Medhurst (Tixy) wrote:
> This patch adds idle-states bindings data collected through a set of
> benchmarking experiments (latency and energy consumption) on Juno
> boards. Latencies data represents the worst case scenarios as required
> by the DT idle-states bindings.
> 
> Signed-off-by: Jon Medhurst <[email-masked]>
> Acked-by: Lorenzo Pieralisi <[email-masked]>
> ---
> 
> I don't know if this needs any other Ack or can finally go in (through
> arm soc tree?)

I think it can be pulled as-is as far as I am concerned.

Thanks,
Lorenzo

> Changes since v2:
> - Updated commit message to Lorenzo's suggested text.
> 
> Changes since v1:
> - Updated latency times to those provided by Lorenzo
> - Included Juno r1 dt
> 
>  arch/arm64/boot/dts/arm/juno-r1.dts | 28 ++++++++++++++++++++++++++++
>  arch/arm64/boot/dts/arm/juno.dts    | 28 ++++++++++++++++++++++++++++
>  2 files changed, 56 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/arm/juno-r1.dts b/arch/arm64/boot/dts/arm/juno-r1.dts
> index 93bc3d7..8826f83 100644
> --- a/arch/arm64/boot/dts/arm/juno-r1.dts
> +++ b/arch/arm64/boot/dts/arm/juno-r1.dts
> @@ -60,6 +60,28 @@
>  			};
>  		};
>  
> +		idle-states {
> +			entry-method = "arm,psci";
> +
> +			CPU_SLEEP_0: cpu-sleep-0 {
> +				compatible = "arm,idle-state";
> +				arm,psci-suspend-param = <0x0010000>;
> +				local-timer-stop;
> +				entry-latency-us = <300>;
> +				exit-latency-us = <1200>;
> +				min-residency-us = <2000>;
> +			};
> +
> +			CLUSTER_SLEEP_0: cluster-sleep-0 {
> +				compatible = "arm,idle-state";
> +				arm,psci-suspend-param = <0x1010000>;
> +				local-timer-stop;
> +				entry-latency-us = <300>;
> +				exit-latency-us = <1200>;
> +				min-residency-us = <2500>;
> +			};
> +		};
> +
>  		A57_0: cpu at 0 {
>  			compatible = "arm,cortex-a57","arm,armv8";
>  			reg = <0x0 0x0>;
> @@ -67,6 +89,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A57_L2>;
>  			clocks = <&scpi_dvfs 0>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A57_1: cpu at 1 {
> @@ -76,6 +99,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A57_L2>;
>  			clocks = <&scpi_dvfs 0>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_0: cpu at 100 {
> @@ -85,6 +109,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_1: cpu at 101 {
> @@ -94,6 +119,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_2: cpu at 102 {
> @@ -103,6 +129,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_3: cpu at 103 {
> @@ -112,6 +139,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A57_L2: l2-cache0 {
> diff --git a/arch/arm64/boot/dts/arm/juno.dts b/arch/arm64/boot/dts/arm/juno.dts
> index 53442b5..dcfcf15 100644
> --- a/arch/arm64/boot/dts/arm/juno.dts
> +++ b/arch/arm64/boot/dts/arm/juno.dts
> @@ -60,6 +60,28 @@
>  			};
>  		};
>  
> +		idle-states {
> +			entry-method = "arm,psci";
> +
> +			CPU_SLEEP_0: cpu-sleep-0 {
> +				compatible = "arm,idle-state";
> +				arm,psci-suspend-param = <0x0010000>;
> +				local-timer-stop;
> +				entry-latency-us = <300>;
> +				exit-latency-us = <1200>;
> +				min-residency-us = <2000>;
> +			};
> +
> +			CLUSTER_SLEEP_0: cluster-sleep-0 {
> +				compatible = "arm,idle-state";
> +				arm,psci-suspend-param = <0x1010000>;
> +				local-timer-stop;
> +				entry-latency-us = <300>;
> +				exit-latency-us = <1200>;
> +				min-residency-us = <2500>;
> +			};
> +		};
> +
>  		A57_0: cpu at 0 {
>  			compatible = "arm,cortex-a57","arm,armv8";
>  			reg = <0x0 0x0>;
> @@ -67,6 +89,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A57_L2>;
>  			clocks = <&scpi_dvfs 0>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A57_1: cpu at 1 {
> @@ -76,6 +99,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A57_L2>;
>  			clocks = <&scpi_dvfs 0>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_0: cpu at 100 {
> @@ -85,6 +109,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_1: cpu at 101 {
> @@ -94,6 +119,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_2: cpu at 102 {
> @@ -103,6 +129,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A53_3: cpu at 103 {
> @@ -112,6 +139,7 @@
>  			enable-method = "psci";
>  			next-level-cache = <&A53_L2>;
>  			clocks = <&scpi_dvfs 1>;
> +			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		A57_L2: l2-cache0 {
> -- 
> 2.1.4
> 
> 
>