linux-kernel - Re: [PATCH 1/2] dt-bindings: arm: idle-states: Add idle-state-disabled property

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Message-ID: <20230608-steadying-idealism-1f8a97db1491@wendy>
Date:   Thu, 8 Jun 2023 10:19:58 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Tushar Nimkar <quic_tnimkar@...cinc.com>
CC:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        <linux-pm@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_lsrao@...cinc.com>,
        <quic_mkshah@...cinc.com>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: arm: idle-states: Add
 idle-state-disabled property

Hey Tushar,

On Thu, Jun 08, 2023 at 02:25:42PM +0530, Tushar Nimkar wrote:
> This change adds idle-state-disabled property using which certain or all
> idle-states can be kept disabled during boot-up. Once boot-up is completed
> same can be enabled using below command.
> 
> echo N > /sys/devices/system/cpu/cpuX/cpuidle/stateX/disable
> 
> Cc: devicetree@...r.kernel.org

Firstly, you should CC the dt-bindings maintainers like
get_maintainer.pl would tell you.
Secondly, there are two 1/2 patches in this series.

> Signed-off-by: Tushar Nimkar <quic_tnimkar@...cinc.com>
> ---
>  Documentation/devicetree/bindings/cpu/idle-states.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/cpu/idle-states.yaml b/Documentation/devicetree/bindings/cpu/idle-states.yaml
> index b8cc826c9501..f999bc666bbd 100644
> --- a/Documentation/devicetree/bindings/cpu/idle-states.yaml
> +++ b/Documentation/devicetree/bindings/cpu/idle-states.yaml
> @@ -358,6 +358,13 @@ patternProperties:
>            systems entry-latency-us + exit-latency-us will exceed
>            wakeup-latency-us by this duration.
>  
> +      idle-state-disabled:
> +        description: |
> +          If present the idle state stays disabled.

> It can be enabled back from
> +          shell using below command.
> +          echo N > /sys/devices/system/cpu/cpuX/cpuidle/stateX/disable

Thirdly, this is operating system specific behaviour, tied to Linux, and
has no place in a binding.

Cheers,
Conor.

> +        type: boolean
> +
>        idle-state-name:
>          $ref: /schemas/types.yaml#/definitions/string
>          description:
> @@ -548,6 +555,7 @@ examples:
>              CPU_SLEEP_0_0: cpu-sleep-0-0 {
>                  compatible = "arm,idle-state";
>                  local-timer-stop;
> +                idle-state-disabled;
>                  arm,psci-suspend-param = <0x0010000>;
>                  entry-latency-us = <250>;
>                  exit-latency-us = <500>;
> -- 
> 2.17.1
> 

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