linux-kernel - Re: [PATCH v10 1/9] dt-bindings: opp: Introduce opp-level bindings

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Message-ID: <20190109090912.ciq4uzo5sjghyms2@vireshk-i7>
Date:   Wed, 9 Jan 2019 14:39:12 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     andy.gross@...aro.org, robh@...nel.org, sboyd@...nel.org,
        ulf.hansson@...aro.org, collinsd@...eaurora.org, mka@...omium.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, henryc.chen@...iatek.com
Subject: Re: [PATCH v10 1/9] dt-bindings: opp: Introduce opp-level bindings

On 09-01-19, 14:34, Rajendra Nayak wrote:
> On some SoCs (especially from Qualcomm and MediaTek) an OPP
> node needs to describe an additional level/corner value
> that is then communicated to a remote microprocessor by the CPU, which
> then takes some actions (like adjusting voltage values across variousi
> rails) based on the value passed.
> 
> Add opp-level as an additional property in the OPP node and describe it
> in the OPP bindings document.
> 
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
>  Documentation/devicetree/bindings/opp/opp.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
> index c396c4c0af92..e83fb7cbfd58 100644
> --- a/Documentation/devicetree/bindings/opp/opp.txt
> +++ b/Documentation/devicetree/bindings/opp/opp.txt
> @@ -129,6 +129,11 @@ Optional properties:
>  - opp-microamp-<name>: Named opp-microamp property. Similar to
>    opp-microvolt-<name> property, but for microamp instead.
>  
> +- opp-level: On some SoC platforms an OPP node can describe a positive value
> +  representing a corner/level that's communicated with a remote microprocessor
> +  (usually called the power manager) which then translates it into a certain
> +  voltage on a voltage rail.
> +

This binding is generic enough and doesn't have anything to do with a
remote mp and so such statements should be avoided in here. And then
Linux can use it the way it wants.

Maybe just say that it describes the performance level of the device.
That's all.

>  - clock-latency-ns: Specifies the maximum possible transition latency (in
>    nanoseconds) for switching to this OPP from any other OPP.
>  
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation

-- 
viresh