linux-kernel - Re: [PATCH v3 6/7] arm64: dts: qcom: sc7180: Add cpuidle low power states

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Date:   Tue, 4 Feb 2020 15:15:09 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>
Cc:     swboyd@...omium.org, agross@...nel.org, david.brown@...aro.org,
        sudeep.holla@....com, Lorenzo.Pieralisi@....com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        bjorn.andersson@...aro.org, evgreen@...omium.org,
        dianders@...omium.org, rnayak@...eaurora.org, ilina@...eaurora.org,
        lsrao@...eaurora.org, ulf.hansson@...aro.org, rjw@...ysocki.net,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 6/7] arm64: dts: qcom: sc7180: Add cpuidle low power
 states

On Mon, Feb 03, 2020 at 07:05:39PM +0530, Maulik Shah wrote:
> Add device bindings for cpuidle states for cpu devices.
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 78 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 78 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index 8011c5f..0aa0ced 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -86,6 +86,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x0>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> +					   &LITTLE_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;

These entries are deleted again by the next patch in this series ('arm64:
dts: qcom: sc7180: Convert to the hierarchical CPU topology layout').
What is the point in adding them in the first place?