Re: [PATCH v6 7/7] arm64: dts: qcom: ipq5424: Add thermal zone nodes

[Manikanta Mylavarapu <quic_mmanikan@quicinc.com>]

On 11/7/2024 8:17 PM, Konrad Dybcio wrote:
> On 6.11.2024 11:25 AM, Manikanta Mylavarapu wrote:
>>
>>
>> On 11/6/2024 2:42 PM, Konrad Dybcio wrote:
>>>
>>>
>>> On 11/6/24 09:47, Manikanta Mylavarapu wrote:
>>>>
>>>>
>>>> On 11/4/2024 7:21 PM, Konrad Dybcio wrote:
>>>>> On 4.11.2024 1:44 PM, Manikanta Mylavarapu wrote:
>>>>>> Add thermal zone nodes for sensors present in IPQ5424.
>>>>>>
>>>>>> Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@quicinc.com>
>>>>>> ---
>>>>> [...]
>>>>>
>>>>>> +
>>>>>> +        cpu3-thermal {
>>>>>> +            polling-delay-passive = <0>;
>>>>>> +            polling-delay = <0>;
>>>>>> +            thermal-sensors = <&tsens 13>;
>>>>>> +
>>>>>> +            trips {
>>>>>> +                cpu-critical {
>>>>>> +                    temperature = <120000>;
>>>>>> +                    hysteresis = <9000>;
>>>>>> +                    type = "critical";
>>>>>> +                };
>>>>>> +
>>>>>> +                cpu-passive {
>>>>>> +                    temperature = <110000>;
>>>>>> +                    hysteresis = <9000>;
>>>>>> +                    type = "passive";
>>>>>
>>>>> You have a passive trip point without passive polling
>>>>>
>>>>
>>>> Okay, will remove this.
>>>
>>> You most likely want to preserve it, while keeping a sensible
>>> polling frequency, so that userspace will be aware of the current
>>> CPU temperature. <100> sounds like a sensible value here.
>>>
>>> Konrad
>>
>> Temperature sensor's present in IPQ5424 supports interrupts.
> 
> Correct.
> 
>> Hence no need to configure polling frequency.
> 
> No, that interrupt firing signifies crossing the temp threshold (meaning
> no updates beyond that) or the tsens watchdog barking.
> 
> Konrad

An interrupt fires when the temperature crosses a threshold.

Thanks & Regards,
Manikanta.