linux-kernel - Re: [PATCH 0/4] thermal: Introduce support for monitoring falling temperatures.

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Message-ID: <5DA78A7A.7030400@linaro.org>
Date:   Wed, 16 Oct 2019 17:24:10 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     rui.zhang@...el.com, edubezval@...il.com,
        daniel.lezcano@...aro.org, vincent.guittot@...aro.org,
        bjorn.andersson@...aro.org, robh+dt@...nel.org
Cc:     amit.kucheria@...durent.com, mark.rutland@....com,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] thermal: Introduce support for monitoring falling
 temperatures.

On 09/18/2019 10:18 PM, Thara Gopinath wrote:
> Thermal framework today supports monitoring for rising temperatures and
> subsequently initiating cooling action in case of a trip point being 
> crossed. There are scenarios where a SoC needs some warming action to be
> activated if the temperature falls below a cetain allowable limit.
> Since warming action can be considered mirror opposite of cooling action,
> most of the thermal framework can be re-used to achieve this.
> 
> To enable thermal framework to monitor falling temperature, a new parameter
> is added to the thermal trip point binding in the device tree to indicate
> the direction(rising/falling) of temperature monitoring. Thermal DT
> driver is extended to capture this information from the device tree 
> entries and to reflect it in the thermal framework as a new enum
> variable in the thermal trip point structure.
> As an initial attempt, step-wise governor is extended to support
> bi-directional monitoring of temprature if a trip point is hit, depending
> on the newly introduced enum variable. Finally thermal sysfs entries are
> extended to indicate the trip point monitor direction.
> 
> Patch series introducing various resources that are used as warming devices
> on Qualcomm sdm845:
> https://lkml.org/lkml/2019/7/29/749 (already merged)
> 
> https://lkml.org/lkml/2019/9/10/727 (under review)

Gentle reminder for reviews!
> 
> 
> Thara Gopinath (4):
>   dt-bindings: thermal: Introduce monitor-falling binding to thermal
>     trip point description
>   thermal: Thermal core and sysfs changes needed to support
>     bi-directional monitoring of trip points.
>   thermal: of-thermal: Extend thermal dt driver to support
>     bi-directional monitoring of a thermal trip point.
>   thermal: step_wise: Extend thermal step-wise governor to monitor
>     falling temperature.
> 
>  .../devicetree/bindings/thermal/thermal.txt        |  8 +++
>  drivers/thermal/of-thermal.c                       | 22 ++++++++
>  drivers/thermal/step_wise.c                        | 59 +++++++++++++++------
>  drivers/thermal/thermal_sysfs.c                    | 60 ++++++++++++++++++++--
>  include/linux/thermal.h                            | 10 ++++
>  include/uapi/linux/thermal.h                       |  2 +-
>  6 files changed, 141 insertions(+), 20 deletions(-)
> 


-- 
Warm Regards
Thara