linux-kernel - Re: [PATCH RFC 1/8] dt-bindings: thermal: Introduce monitor-falling parameter to thermal trip point binding

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Date:   Mon, 28 Sep 2020 07:21:18 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     rui.zhang@...el.com, daniel.lezcano@...aro.org, agross@...nel.org,
        bjorn.andersson@...aro.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, lukasz.luba@....com,
        amitk@...nel.org
Subject: Re: [PATCH RFC 1/8] dt-bindings: thermal: Introduce monitor-falling
 parameter to thermal trip point binding

Hi Rob,
Thanks for the review.

On 9/23/20 12:03 PM, Rob Herring wrote:
> On Wed, Sep 16, 2020 at 11:22:19PM -0400, Thara Gopinath wrote:
>> Introduce a new binding parameter to thermal trip point description
>> to indicate whether the temperature level specified by the trip point
>> is monitored for a rise or fall in temperature.
>>
>> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
>> ---
>>   .../devicetree/bindings/thermal/thermal-zones.yaml         | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
>> index 3ec9cc87ec50..cc1332ad6c16 100644
>> --- a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
>> +++ b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml
>> @@ -161,6 +161,13 @@ patternProperties:
>>                     The active trip type can be used to control other HW to
>>                     help in cooling e.g. fans can be sped up or slowed down
>>   
>> +              monitor-falling:
>> +                description: |
>> +                  boolean, If true, the trip point is being monitored for
>> +                  falling temperature. If false/absent/default, the trip
>> +                  point is being monitored for rising temperature.
>> +                type: boolean
> 
> What if you wanted to monitor for both?

You usually don't want to. At really low temperature trip (5 degree C or 
0 degree C) you care about starting to monitor when the temperature 
falls below the trip. At high temp trip points, you care about starting 
to monitor when the temperature rises above the trip point. The thermal 
framework takes care of stopping the monitoring (dependent on type of 
monitoring, hysteresis etc.)
> 
>> +
>>               required:
>>                 - temperature
>>                 - hysteresis
>> -- 
>> 2.25.1
>>

-- 
Warm Regards
Thara