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

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Date:   Fri, 9 Jun 2023 15:14:07 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Tushar Nimkar <quic_tnimkar@...cinc.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     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

On 08/06/2023 10:55, Tushar Nimkar wrote:
> This change adds idle-state-disabled property using which certain or all

Please do not use "This commit/patch", but imperative mood. See longer
explanation here:
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

> idle-states can be kept disabled during boot-up. Once boot-up is completed
> same can be enabled using below command.
> 

I don't understand and you did not explain here, why this is useful and
why this is needed.

> echo N > /sys/devices/system/cpu/cpuX/cpuidle/stateX/disable


> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Tushar Nimkar <quic_tnimkar@...cinc.com>

Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC.  It might happen, that command when run on an older
kernel, gives you outdated entries.  Therefore please be sure you base
your patches on recent Linux kernel.

> ---
>  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

This is Linux specific command, so does not fit the bindings.

Best regards,
Krzysztof