Re: [PATCH v7 9/9] arm64: dts: qcom: hamoa: Enable CDSP cooling

[Stephan Gerhold <stephan.gerhold@linaro.org>]

On Fri, Jul 31, 2026 at 04:03:49PM +0530, Gaurav Kohli wrote:
> From: Dipa Ramesh Mantre <dipa.mantre@oss.qualcomm.com>
> 
> Unlike the CPU, the CDSP does not throttle its speed automatically
> when it reaches high temperatures in hamoa.
> 
> Set up CDSP cooling by throttling the cdsp, when it reaches 95°C.
> 
> Add polling-delay-passive so the governor periodically evaluates
> the zone during passive cooling and steps up cooling levels when
> temperature stabilizes below the next trip.
> 

Would be good to mention why you are treating hamoa-iot-evk differently.

> Signed-off-by: Dipa Ramesh Mantre <dipa.mantre@oss.qualcomm.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Signed-off-by: Gaurav Kohli <gaurav.kohli@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts | 32 +++++++++++++++
>  arch/arm64/boot/dts/qcom/hamoa.dtsi        | 63 ++++++++++++++++++++++++++++++
>  2 files changed, 95 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
> index 9fa86bb6438e..a146be1cb5fb 100644
> --- a/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
> +++ b/arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts
> @@ -1684,4 +1684,36 @@ trip-point0 {
>  			};
>  		};
>  	};
> +
> +	nsp0-thermal {
> +		trips {
> +			trip-point1 {
> +				temperature = <105000>;
> +			};
> +		};
> +	};
> +
> +	nsp1-thermal {
> +		trips {
> +			trip-point1 {
> +				temperature = <105000>;
> +			};
> +		};
> +	};
> +
> +	nsp2-thermal {
> +		trips {
> +			trip-point1 {
> +				temperature = <105000>;
> +			};
> +		};
> +	};
> +
> +	nsp3-thermal {
> +		trips {
> +			trip-point1 {
> +				temperature = <105000>;
> +			};
> +		};
> +	};
>  };

Please avoid overriding node values like this... One quick rename of one
of the involved nodes and this will be silently broken without compile
error. Nowadays dtbs_check will *probably* catch these, but if you
override values using the label reference you would notice it
immediately when compiling.

All those nodes already have a label you can use:

&nsp0_alert0 {
	temperature = <105000>;
};

&nsp1_alert0 {
	temperature = <105000>;
};

If the same pattern is already used for other thermal overrides in
hamoa-iot-evk.dts, it would be good to prepend a patch to fix those too.

Thanks,
Stephan