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 13:55:05 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.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

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.

-- 
With Best Regards,
Andy Shevchenko