linux-kernel - Re: [PATCH v2 0/2] Add a generic virtual thermal sensor

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Message-ID: <7cddcdb7-4efd-bfdb-3d86-f5862ea0b7fe@baylibre.com>
Date:   Fri, 17 Sep 2021 15:33:34 +0200
From:   Alexandre Bailon <abailon@...libre.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, rui.zhang@...el.com,
        amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben.tseng@...iatek.com, khilman@...libre.com, mka@...omium.org
Subject: Re: [PATCH v2 0/2] Add a generic virtual thermal sensor

Hi Daniel,

On 9/17/21 2:41 PM, Daniel Lezcano wrote:
> On 17/09/2021 09:27, Alexandre Bailon wrote:
>> This series add a virtual thermal sensor.
>> It could be used to get a temperature using some thermal sensors.
>> Currently, the supported operations are max, min and avg.
>> The virtual sensor could be easily extended to support others operations.
>>
>> Note:
>> Currently, thermal drivers must explicitly register their sensors to make them
>> available to the virtual sensor.
>> This doesn't seem a good solution to me and I think it would be preferable to
>> update the framework to register the list of each available sensors.
> Why must the drivers do that ?
Because there are no central place where thermal sensor are registered.
The only other way I found was to update thermal_of.c,
to register the thermal sensors and make them available later to the 
virtual thermal sensor.

To work, the virtual thermal need to get the sensor_data the ops from 
the thermal sensor.
And as far I know, this is only registered in thermal_of.c, in the 
thermal zone data
but I can't access it directly from the virtual thermal sensor.

How would you do it ?

Thanks,
Alexandre
>
>> Changes in v2:
>> - Fix some warnings / errors reported by kernel test robot
>> - rename some struct and functions with a more accurate name
>> - update the dt bindings: rename type attribute to aggregation-function
>> - factorize a little bit the aggregation functions
>>
>> Alexandre Bailon (2):
>>    dt-bindings: Add bindings for the virtual thermal sensor
>>    thermal: add a virtual sensor to aggregate temperatures
>>
>>   .../thermal/virtual,thermal-sensor.yaml       |  67 +++
>>   drivers/thermal/Kconfig                       |   8 +
>>   drivers/thermal/Makefile                      |   1 +
>>   drivers/thermal/virtual-sensor.h              |  51 +++
>>   drivers/thermal/virtual_sensor.c              | 400 ++++++++++++++++++
>>   include/dt-bindings/thermal/virtual-sensor.h  |  15 +
>>   6 files changed, 542 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/thermal/virtual,thermal-sensor.yaml
>>   create mode 100644 drivers/thermal/virtual-sensor.h
>>   create mode 100644 drivers/thermal/virtual_sensor.c
>>   create mode 100644 include/dt-bindings/thermal/virtual-sensor.h
>>
>