linux-kernel - Re: [PATCH v5 09/12] dt-bindings: misc: add bindings for throttler

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Message-id: <5B616F0D.1050901@samsung.com>
Date:   Wed, 01 Aug 2018 17:27:57 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v5 09/12] dt-bindings: misc: add bindings for throttler

Hi Matthias,

On 2018년 07월 04일 08:47, Matthias Kaehlcke wrote:
> The Throttler is used for non-thermal throttling of system components
> like CPUs or devfreq devices.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> --
> Changes in v5:
> - patch added to the series (replacing "dt-bindings: PM / OPP: add
>   opp-throttlers property")
> ---
>  .../devicetree/bindings/misc/throttler.txt          | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/throttler.txt
> 
> diff --git a/Documentation/devicetree/bindings/misc/throttler.txt b/Documentation/devicetree/bindings/misc/throttler.txt
> new file mode 100644
> index 000000000000..2ea80c62dbe1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/throttler.txt
> @@ -0,0 +1,13 @@
> +Throttler driver
> +
> +The Throttler is used for non-thermal throttling of system components like
> +CPUs or devfreq devices.
> +
> +Required properties:
> +- throttler-opps	Array of OPP-v2 phandles with the OPPs used for
> +			throttling.
> +
> +Example:
> +	throttler {
> +		 throttler-opps = <&cpu0_opp03, &cpu1_opp02, &gpu_opp03>;
> +	};
> 

If possible, I hope the more detailed example for "cpu0_opp03, &cpu1_opp02, &gpu_opp03"
because I'm confusing the meaning of 'cpu0_opp03' phandle.

cpu0_opp03 indicates the only one specific OPP entry among set of OPP entries of CPU0 cpufreq? or
cpu0_opp03 indicates the set of OPP entries for CPU0 cpufreq ?


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics