linux-kernel - Re: [PATCH v4 4/5] iio: adc: ti-adc128s052: Add lower resolution devices support

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Message-ID: <aGB2Fnv797Wrenza@dev-linux>
Date: Sat, 28 Jun 2025 16:09:10 -0700
From: Sukrut Bellary <sbellary@...libre.com>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	Angelo Compagnucci <angelo.compagnucci@...il.com>,
	Nishanth Menon <nm@...com>, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/5] iio: adc: ti-adc128s052: Add lower resolution
 devices support

On Sat, Jun 14, 2025 at 09:45:43PM +0300, Andy Shevchenko wrote:
> On Sat, Jun 14, 2025 at 12:15 PM Sukrut Bellary <sbellary@...libre.com> wrote:
> >
> > The adcxx communicates with a host processor via an SPI/Microwire Bus
> > interface. The device family responds with 12-bit data, of which the LSB bits
> > are transmitted by the lower resolution devices as 0.
> > The unavailable bits are 0 in LSB.
> > Shift is calculated per resolution and used in scaling and raw data read.
> >
> > Lets reuse the driver to support the family of devices with name
> > ADC<bb><c>S<sss>, where
> 
> I believe it's incorrect, i.e. it's something like ...S<ss><?>, where
> <?> is something you need to clarify, and <ss> is definitely a speed
> in kSPS.
>
Thank you for the review.
I am not sure about the last s in <sss>.
It could be TI's silicon spins versioning.
I couldn't find any information about it in any of the datasheets.
I can drop the last s or mark it as <ssx> and specify the first two <ss> as
maximum speed.

> > * bb is the resolution in number of bits (8, 10, 12)
> > * c is the number of channels (1, 2, 4, 8)
> > * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
> > and 101 for 1 MSPS)
> >
> > Complete datasheets are available at TI's website here:
> > https://www.ti.com/lit/ds/symlink/adc<bb><c>s<sss>.pdf
> >
> > Tested only with ti-adc102s051 on BegalePlay SBC.
> > https://www.beagleboard.org/boards/beagleplay
> 
> ...
> 
> >   * https://www.ti.com/lit/ds/symlink/adc128s052.pdf
> >   * https://www.ti.com/lit/ds/symlink/adc122s021.pdf
> >   * https://www.ti.com/lit/ds/symlink/adc124s021.pdf
> 
> Forgot to sort out in the previous patch?
>
I will fix this in respin.

> -- 
> With Best Regards,
> Andy Shevchenko