linux-kernel - Re: [PATCH v1 2/4] iio: adc: Add support for MediaTek MT6357/8/9 Auxiliary ADC

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Date: Tue, 4 Jun 2024 13:57:54 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Jonathan Cameron <jic23@...nel.org>, lars@...afoo.de, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, matthias.bgg@...il.com,
 lee@...nel.org, andy@...nel.org, nuno.sa@...log.com, bigunclemax@...il.com,
 dlechner@...libre.com, marius.cristea@...rochip.com,
 marcelo.schmitt@...log.com, fr0st61te@...il.com, mitrutzceclan@...il.com,
 mike.looijmans@...ic.nl, marcus.folkesson@...il.com,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v1 2/4] iio: adc: Add support for MediaTek MT6357/8/9
 Auxiliary ADC

Il 04/06/24 12:55, Andy Shevchenko ha scritto:
> On Tue, Jun 4, 2024 at 12:42 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@...labora.com> wrote:
>> Il 02/06/24 12:11, Jonathan Cameron ha scritto:
>>> On Thu, 30 May 2024 11:34:08 +0200
>>> AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> wrote:
> 
> ...
> 
>>> What are IMP channels?
>>
>> Honestly? Well, it's called like that. I don't have any clear description of that
>> and not even datasheets are unrolling the meaning of "IMP". So.. I don't know.
>>
>> What I know is what I wrote in the driver, and this is:
>> * IMP has IBAT and VBAT ADCs
>> * It needs different handling from the other ADCs, as shown.
>>
>> ...and nothing else :-(
> 
> I could speculate with confidence that this means IMPedance (since it's ADC).
> 
>  From MTK6329  datasheet:
> "The hardware also includes necessary modes to allow for simultaneous
> current and voltage measurement
> which can be utilized to estimate the battery impedance."
> And googling in vendor trees also suggests the same.
> 

That does make a lot of sense. Thanks for that, I don't have the 6329 datasheet.

Great, one more piece added to the puzzle!

Cheers,
Angelo