linux-kernel - Re: [RFC RESEND PATCH 2/7] dt-bindings: soc: Add opp table on scpsys bindings

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Date:   Thu, 3 Jan 2019 12:45:54 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Henry Chen <henryc.chen@...iatek.com>
Cc:     Viresh Kumar <vireshk@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Fan Chen <fan.chen@...iatek.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        Kees Cook <keescook@...omium.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC RESEND PATCH 2/7] dt-bindings: soc: Add opp table on scpsys bindings

On Wed, Jan 2, 2019 at 8:10 AM Henry Chen <henryc.chen@...iatek.com> wrote:
>
> Add opp table on scpsys dt-bindings for Mediatek SoC.
>
> Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
> ---
>  Documentation/devicetree/bindings/opp/mtk-opp.txt  | 24 +++++++++++++
>  .../devicetree/bindings/soc/mediatek/scpsys.txt    | 42 ++++++++++++++++++++++
>  2 files changed, 66 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/opp/mtk-opp.txt
>
> diff --git a/Documentation/devicetree/bindings/opp/mtk-opp.txt b/Documentation/devicetree/bindings/opp/mtk-opp.txt
> new file mode 100644
> index 0000000..036be1c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/opp/mtk-opp.txt
> @@ -0,0 +1,24 @@
> +Mediatek OPP bindings to descibe OPP nodes with level values
> +
> +OPP tables for devices on Mediatek platforms require an additional
> +platform specific level value to be specified.
> +This value is passed on to the mediatek Power Management Unit by the
> +CPU, which then takes the necessary actions to set a voltage rail
> +to an appropriate voltage based on the value passed.
> +
> +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-mtk-level"
> +
> +* OPP Node
> +
> +Required properties:
> +- mtk,level: On Mediatek platforms an OPP node can describe a positive value
> +representing a level that's communicated with a our power management hardware
> +which then translates it into a certain voltage on a voltage rail.

Work with the Qcom folks and create a common level property.

Rob