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

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Message-ID: <CAHp75VdJRCnxEQDXsEi3yRcPvX9-JLUVkbm_Fd6YFnrHWYb1VQ@mail.gmail.com>
Date: Tue, 4 Jun 2024 14:20:44 +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 1:55 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> 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 datasheet for MTK6359 I found on
https://ebin.pub/qdownload/mt6359-pmic-datasheet-15nbsped.html
also has the same wording in "3.2.7 Fuel Gauge".

> "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 vendor trees also suggests the same.

-- 
With Best Regards,
Andy Shevchenko