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

[Gaurav Kohli <gaurav.kohli@oss.qualcomm.com>]

On 7/31/2026 6:52 PM, Gaurav Kohli wrote:
> 
> 
> On 7/31/2026 4:50 PM, Stephan Gerhold wrote:
>> 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.
> 
> thanks for review, will add the reasoning.
> 
>>
>>> 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

thanks for pointing other nodes also.
For gpu node, will send separate patch over current series.

>> hamoa-iot-evk.dts, it would be good to prepend a patch to fix those too.
> 
> thanks for review, will update this.
> 
>>
>> Thanks,
>> Stephan
>