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SubjectRe: [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@nvidia.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
>

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