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

Niklas Cassel
2019-05-14T16:12:41Z

On Fri, May 10, 2019 at 04:59:43PM +0530, Amit Kucheria wrote:
> From: Niklas Cassel <niklas.cassel@linaro.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@linaro.org>
> Reviewed-by: Vinod Koul <vkoul@kernel.org>
> Signed-off-by: Amit Kucheria <amit.kucheria@linaro.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
>