linux-kernel - Re: [PATCH v1 04/12] of: Add bindings of gpu hw throttle for Tegra soctherm

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Date:   Mon, 18 Feb 2019 14:33:14 -0600
From:   Rob Herring <robh@...nel.org>
To:     Wei Ni <wni@...dia.com>
Cc:     thierry.reding@...il.com, daniel.lezcano@...aro.org,
        edubezval@...il.com, linux-tegra@...r.kernel.org,
        rui.zhang@...el.com, srikars@...dia.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 04/12] of: Add bindings of gpu hw throttle for Tegra
 soctherm

On Tue, Dec 18, 2018 at 03:34:36PM +0800, Wei Ni wrote:
> Add "nvidia,gpu-throt-level" property to set gpu hw
> throttle level.
> 
> Signed-off-by: Wei Ni <wni@...dia.com>
> ---
>  .../bindings/thermal/nvidia,tegra124-soctherm.txt  | 17 +++++++++++++++--
>  include/dt-bindings/thermal/tegra124-soctherm.h    | 22 ++++++++++++++++++----
>  2 files changed, 33 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> index ab66d6feab4b..cf6d0be56b7a 100644
> --- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> +++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> @@ -52,6 +52,15 @@ Required properties :
>          Must set as following values:
>          TEGRA_SOCTHERM_THROT_LEVEL_LOW, TEGRA_SOCTHERM_THROT_LEVEL_MED
>          TEGRA_SOCTHERM_THROT_LEVEL_HIGH, TEGRA_SOCTHERM_THROT_LEVEL_NONE
> +      - nvidia,gpu-throt-level: This property is for Tegra124 and Tegra210.

Also, why not just use percents like nvidia,cpu-throt-percent?

> +        It is the level of pulse skippers, which used to throttle clock
> +        frequencies. It indicates gpu clock throttling depth and can be
> +        programmed to any of the following values which represent a throttling
> +        percentage:
> +        TEGRA_SOCTHERM_THROT_LEVEL_NONE (0%)
> +        TEGRA_SOCTHERM_THROT_LEVEL_LOW (50%),
> +        TEGRA_SOCTHERM_THROT_LEVEL_MED (75%),
> +        TEGRA_SOCTHERM_THROT_LEVEL_HIGH (85%).
>        - #cooling-cells: Should be 1. This cooling device only support on/off state.
>          See ./thermal.txt for a description of this property.