linux-kernel - Re: [RFC][PATCH 1/2] dt-bindings: power: add Energy Model bindings

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Message-ID: <20220222030337.ijnfrh367illmidr@vireshk-i7>
Date:   Tue, 22 Feb 2022 08:33:37 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        rafael@...nel.org, daniel.lezcano@...aro.org, nm@...com,
        sboyd@...nel.org, mka@...omium.org, dianders@...omium.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [RFC][PATCH 1/2] dt-bindings: power: add Energy Model bindings

On 21-02-22, 22:51, Lukasz Luba wrote:
> Add DT bindings for the Energy Model information.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
>  .../bindings/power/energy-model.yaml          | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/energy-model.yaml
> 
> diff --git a/Documentation/devicetree/bindings/power/energy-model.yaml b/Documentation/devicetree/bindings/power/energy-model.yaml
> new file mode 100644
> index 000000000000..804a9b324925
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/energy-model.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/energy-model.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Energy Model Bindings
> +
> +maintainers:
> +  - Lukasz Luba <lukasz.luba@....com>
> +
> +description: |+
> +  Devices work at specific performance states (frequencies). The power which
> +  is used at a given performance state is an important information. A framework
> +  which maintains this information is Energy Model. This document defines
> +  bindings for these Energy Model performance states applicable across wide
> +  range of devices. For illustration purpose, this document uses GPU as a device.
> +
> +  This binding only supports frequency-power pairs.
> +
> +select: true
> +
> +properties:
> +  operating-points:
> +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +    items:
> +      items:
> +        - description: Frequency in kHz
> +        - description: Power in uW
> +
> +
> +additionalProperties: true
> +examples:
> +    {
> +       gpu_energy_model: energy-model {
> +               compatible = "energy-model";
> +               energy-model-entries = <
> +                               200000 300000
> +                               297000 500000
> +                               400000 800000
> +                               500000 1400000
> +                               600000 2000000
> +                               800000 2800000
> +                               >;
> +       };
> +    };
> +
> +    &gpu {
> +       energy-model = <&gpu_energy_model>;
> +    };

What about getting this from the OPP table instead? There is no point adding
similar tables for a device.

-- 
viresh