linux-kernel - Re: [PATCH 3/7] dt-bindings: opp: Introduce qcom-opp bindings

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Message-ID: <152310634007.180276.1696228496997606733@swboyd.mtv.corp.google.com>
Date:   Sat, 07 Apr 2018 06:05:40 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>, andy.gross@...aro.org,
        ulf.hansson@...aro.org, viresh.kumar@...aro.org
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: Re: [PATCH 3/7] dt-bindings: opp: Introduce qcom-opp bindings

Quoting Rajendra Nayak (2018-03-15 21:08:20)
> On Qualcomm platforms, 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 various rails)
> based on the value passed.
> 
> Describe these bindings in the qcom-opp bindings document.
> 
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
> diff --git a/Documentation/devicetree/bindings/opp/qcom-opp.txt b/Documentation/devicetree/bindings/opp/qcom-opp.txt
> new file mode 100644
> index 000000000000..56fe87751881
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/opp/qcom-opp.txt
> @@ -0,0 +1,25 @@
> +Qualcomm OPP bindings to descibe OPP nodes with corner/level values
> +
> +OPP tables for devices on qualcomm platforms require an additional

Capitalize qualcomm?

> +platform specific corner/level value to be specified.
> +This value is passed on to the RPM (Resource Power Manager) by
> +the CPU, which then takes the necessary actions to set a voltage
> +rail to a appropriate voltage based on the value passed.

to an

> +
> +The bindings are based on top of the operating-points-v2 bindings
> +described in Documentation/devicetree/bindings/opp/opp.txt
> +Additional properties are described below.
> +
> +* OPP Table Node
> +
> +Required properties:
> +- compatible: Allow OPPs to express their compatibility. It should be:
> +  "operating-points-v2-qcom"

Can this be operating-points-v2-level or -qcom-level? Just worried that
qcom is too generic.

> +
> +* OPP Node
> +
> +Required properties:
> +- qcom,level: On Qualcomm platforms an OPP node can describe a positive value
> +representing a corner/level thats comminicated with a remote microprocessor

s/thats/that's/

> +(Usually called the RPM) which then translates it into a certain voltage on

lowercase Usually

> +a voltage rail.