linux-kernel - Re: [PATCH v6 4/4] thermal: k3_j72xx_bandgap: Add the bandgap driver support

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Date:   Wed, 11 May 2022 10:27:04 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     "J, KEERTHY" <j-keerthy@...com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        <robh+dt@...nel.org>, <rui.zhang@...el.com>, <amitk@...nel.org>,
        <kristo@...nel.org>, <krzysztof.kozlowski@...aro.org>
CC:     <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 4/4] thermal: k3_j72xx_bandgap: Add the bandgap driver
 support



On 10/05/22 22:47, J, KEERTHY wrote:
> 
> 
> On 5/10/2022 8:55 PM, Daniel Lezcano wrote:
>> On 09/05/2022 05:10, J, KEERTHY wrote:
>>>
>>>
>>> On 4/27/2022 12:16 PM, Keerthy wrote:
>>>> Add VTM thermal support. In the Voltage Thermal Management
>>>> Module(VTM), K3 J72XX supplies a voltage reference and a temperature
>>>> sensor feature that are gathered in the band gap voltage and
>>>> temperature sensor (VBGAPTS) module. The band gap provides current and
>>>> voltage reference for its internal circuits and other analog IP
>>>> blocks. The analog-to-digital converter (ADC) produces an output value
>>>> that is proportional to the silicon temperature.
>>>>
>>>> Currently reading temperatures only is supported.  There are no
>>>> active/passive cooling agent supported.
>>>>
>>>> J721e SoCs have errata i2128: https://www.ti.com/lit/pdf/sprz455
>>>>
>>>> The VTM Temperature Monitors (TEMPSENSORs) are trimmed during
>>>> production,
>>>> with the resulting values stored in software-readable registers.
>>>> Software
>>>> should use these  register values when translating the Temperature
>>>> Monitor output codes to temperature values.
>>>>
>>>> It has an involved workaround. Software needs to read the error
>>>> codes for
>>>> -40C, 30C, 125C from the efuse for each device & derive a new look
>>>> up table
>>>> for adc to temperature conversion. Involved calculating slopes &
>>>> constants
>>>> using 3 different straight line equations with adc refernce codes as
>>>> the
>>>> y-axis & error codes in the x-axis.
>>>>
>>>> -40C to 30C
>>>> 30C to 125C
>>>> 125C to 150C
>>>>
>>>> With the above 2 line equations we derive the full look-up table to
>>>> workaround the errata i2128 for j721e SoC.
>>>
>>> Hi Daniel,
>>>
>>> Any feedback on this series? Let me know.
>>
>> There are a few but that would be nit picking and I don't want to
>> postpone this driver any longer.
>>
>> How do you want to proceed? Shall I take it through my tree?
> 
> Hi Daniel,
> 
> Patch 1 & 4 i.e Documentation patch and driver patch can be picked by
> you. I believe Vignesh will take the dts patches.
> 
> Vignesh,
> 
> Can you confirm?
> 

Yes, please decouple DT patches from driver+binding patches as they are
to be applied to different trees.


-- 
Regards
Vignesh