linux-kernel - Re: [PATCH v1 11/12] of: Add bindings of OC hw throttle for Tegra soctherm

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Date:   Mon, 18 Feb 2019 14:32:04 -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 11/12] of: Add bindings of OC hw throttle for Tegra
 soctherm

On Tue, Dec 18, 2018 at 03:34:43PM +0800, Wei Ni wrote:
> Add OC HW throttle configuration for soctherm in DT.
> It is used to describe the OCx throttle events.
> 
> Signed-off-by: Wei Ni <wni@...dia.com>
> ---
>  .../bindings/thermal/nvidia,tegra124-soctherm.txt  | 26 ++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> index cf6d0be56b7a..d112a8e59ec3 100644
> --- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> +++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> @@ -64,6 +64,21 @@ Required properties :
>        - #cooling-cells: Should be 1. This cooling device only support on/off state.
>          See ./thermal.txt for a description of this property.
>  
> +      Optional properties: The following properties are T210 specific and
> +      valid only for OCx throttle events.
> +      - nvidia,count-threshold: Specifies the number of OC events that are
> +        required for triggering an interrupt. Interrupts are not triggered if
> +        the property is missing. A value of 0 will interrupt on every OC alarm.
> +      - nvidia,polarity-active-low: Configures the polarity of the OC alaram
> +        signal. Accepted values are 1 for assert low and 0 for assert high.
> +        Default value is 0.

Why not boolean?

> +      - nvidia,alarm-filter: Number of clocks to filter event. When the filter
> +        expires (which means the OC event has not occurred for a long time),
> +        the counter is cleared and filter is rearmed. Default value is 0.
> +      - nvidia,throttle-period: Specifies the number of uSec for which
> +        throttling is engaged after the OC event is deasserted. Default value
> +        is 0.

Needs a unit suffix as defined in property-units.txt.

> +
>  Optional properties:
>  - nvidia,thermtrips : When present, this property specifies the temperature at
>    which the soctherm hardware will assert the thermal trigger signal to the
> @@ -134,6 +149,17 @@ Example :
>  			 * arbiter will select the highest priority as the final throttle
>  			 * settings to skip cpu pulse.
>  			 */
> +
> +			throttle_oc1: oc1 {
> +				nvidia,priority = <50>;
> +				nvidia,polarity-active-low = <1>;
> +				nvidia,count-threshold = <100>;
> +				nvidia,alarm-filter = <5100000>;
> +				nvidia,throttle-period = <0>;
> +				nvidia,cpu-throt-percent = <75>;
> +				nvidia,gpu-throt-level =
> +						<TEGRA_SOCTHERM_THROT_LEVEL_MED>;
> +                        };
>  		};
>  	};
>  
> -- 
> 2.7.4
>