linux-kernel - Re: [PATCH 3/6] arm64: dts: hisilicon: Add missing cooling device properties for CPUs

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Date:   Sat, 26 May 2018 19:00:20 +0100
From:   Wei Xu <xuwei5@...ilicon.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>, <arm@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
CC:     Vincent Guittot <vincent.guittot@...aro.org>,
        <ionela.voinescu@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        <chris.redpath@....com>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] arm64: dts: hisilicon: Add missing cooling device
 properties for CPUs

Hi Viresh,

On 2018/5/25 6:40, Viresh Kumar wrote:
> The cooling device properties, like "#cooling-cells" and
> "dynamic-power-coefficient", should either be present for all the CPUs
> of a cluster or none. If these are present only for a subset of CPUs of
> a cluster then things will start falling apart as soon as the CPUs are
> brought online in a different order. For example, this will happen
> because the operating system looks for such properties in the CPU node
> it is trying to bring up, so that it can register a cooling device.
> 
> Add such missing properties.
> 
> Do minor rearrangement as well to keep ordering consistent.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Thanks!
Applied to the hisilicon fix tree.

Best Regards,
Wei

> ---
>  arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> index 586b281cd531..247024df714f 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> @@ -88,8 +88,8 @@
>  			next-level-cache = <&CLUSTER0_L2>;
>  			clocks = <&stub_clock 0>;
>  			operating-points-v2 = <&cpu_opp_table>;
> -			#cooling-cells = <2>; /* min followed by max */
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
>  			dynamic-power-coefficient = <311>;
>  		};
>  
> @@ -101,6 +101,8 @@
>  			next-level-cache = <&CLUSTER0_L2>;
>  			operating-points-v2 = <&cpu_opp_table>;
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
> +			dynamic-power-coefficient = <311>;
>  		};
>  
>  		cpu2: cpu@2 {
> @@ -111,6 +113,8 @@
>  			next-level-cache = <&CLUSTER0_L2>;
>  			operating-points-v2 = <&cpu_opp_table>;
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
> +			dynamic-power-coefficient = <311>;
>  		};
>  
>  		cpu3: cpu@3 {
> @@ -121,6 +125,8 @@
>  			next-level-cache = <&CLUSTER0_L2>;
>  			operating-points-v2 = <&cpu_opp_table>;
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
> +			dynamic-power-coefficient = <311>;
>  		};
>  
>  		cpu4: cpu@100 {
> @@ -131,6 +137,8 @@
>  			next-level-cache = <&CLUSTER1_L2>;
>  			operating-points-v2 = <&cpu_opp_table>;
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
> +			dynamic-power-coefficient = <311>;
>  		};
>  
>  		cpu5: cpu@101 {
> @@ -141,6 +149,8 @@
>  			next-level-cache = <&CLUSTER1_L2>;
>  			operating-points-v2 = <&cpu_opp_table>;
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
> +			dynamic-power-coefficient = <311>;
>  		};
>  
>  		cpu6: cpu@102 {
> @@ -151,6 +161,8 @@
>  			next-level-cache = <&CLUSTER1_L2>;
>  			operating-points-v2 = <&cpu_opp_table>;
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
> +			dynamic-power-coefficient = <311>;
>  		};
>  
>  		cpu7: cpu@103 {
> @@ -161,6 +173,8 @@
>  			next-level-cache = <&CLUSTER1_L2>;
>  			operating-points-v2 = <&cpu_opp_table>;
>  			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
> +			#cooling-cells = <2>; /* min followed by max */
> +			dynamic-power-coefficient = <311>;
>  		};
>  
>  		CLUSTER0_L2: l2-cache0 {
>