linux-kernel - Re: [PATCH] ARM: dts: mt8173: support arm64 cpuidle-dt

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Date:	Tue, 31 Mar 2015 16:33:23 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Howard Chen <howard.chen@...aro.org>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	"srv_heupstream@...iatek.com" <srv_heupstream@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH] ARM: dts: mt8173: support arm64 cpuidle-dt

On Tue, Mar 31, 2015 at 04:24:37AM +0100, Howard Chen wrote:
> add an idle-states node to describe the mt8173 cpu idle
> add a reference to the idle-states node in each CPU node

You are also changing the PSCI version in this patch, but
I think it is acceptable to have multiple changes at once
to avoid churning out dts changes.

Commit log should be rewritten, lack of punctuation,
missing capitalization, etc; in short, please rewrite it.

> Signed-off-by: Howard Chen <howard.chen@...aro.org>
> ---
>  arch/arm64/boot/dts/mediatek/mt8173.dtsi | 30 ++++++++++++++++++++++++++----
>  1 file changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index 8554ec3..96dff1e 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -48,6 +48,8 @@
>  			device_type = "cpu";
>  			compatible = "arm,cortex-a53";
>  			reg = <0x000>;
> +			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0_0 &CLUSTER_SLEEP_0>;

You are free to use the labels you want, but you tell me why
CPU_SLEEP_0_0 is used where eg CPU_SLEEP_0 would be sufficient
and clearer (comment valid for all cpu nodes). Copy'n'paste ?

>  		};
>  
>  		cpu1: cpu@1 {
> @@ -55,6 +57,7 @@
>  			compatible = "arm,cortex-a53";
>  			reg = <0x001>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		cpu2: cpu@100 {
> @@ -62,6 +65,7 @@
>  			compatible = "arm,cortex-a57";
>  			reg = <0x100>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0_0 &CLUSTER_SLEEP_0>;
>  		};
>  
>  		cpu3: cpu@101 {
> @@ -69,15 +73,33 @@
>  			compatible = "arm,cortex-a57";
>  			reg = <0x101>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&CPU_SLEEP_0_0 &CLUSTER_SLEEP_0>;
>  		};
> +
> +		idle-states {
> +			entry-method = "arm,psci-0.2";

"arm,psci"

> +
> +			CPU_SLEEP_0_0: cpu-sleep-0-0 {
> +				compatible = "arm,idle-state";
> +				arm,psci-suspend-param = <0x0010000>;
> +				entry-latency-us = <600>;
> +				exit-latency-us = <600>;
> +				min-residency-us = <1200>;
> +			};
> +
> +			CLUSTER_SLEEP_0: cluster-sleep-0 {
> +				compatible = "arm,idle-state";
> +				arm,psci-suspend-param = <0x1010000>;
> +				entry-latency-us = <800>;
> +				exit-latency-us = <1000>;
> +				min-residency-us = <2000>;
> +				wakeup-latency-us = <1000>;
> +			};

You tested these latency values right ?

>  	};
>  
>  	psci {
> -		compatible = "arm,psci";
> +		compatible = "arm,psci-0.2";

See my comment in the commit log, this change is independent of idle
states changes.

Thanks,
Lorenzo

>  		method = "smc";
> -		cpu_suspend   = <0x84000001>;
> -		cpu_off	      = <0x84000002>;
> -		cpu_on	      = <0x84000003>;
>  	};
>  
>  	uart_clk: dummy26m {
> -- 
> 1.9.1
> 
> --
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