linux-kernel - Re: [PATCH v5] iio: adc: stm32: add oversampling support

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Message-ID: <CAHp75VfwiMAa+y+_sHpJ27D34=PtMG=nskXbV+GuNgWpH-85KQ@mail.gmail.com>
Date: Thu, 24 Apr 2025 20:01:40 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Olivier Moysan <olivier.moysan@...s.st.com>
Cc: Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
	Nuno Sá <nuno.sa@...log.com>, 
	Andy Shevchenko <andy@...nel.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Fabrice Gasnier <fabrice.gasnier@...s.st.com>, linux-iio@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] iio: adc: stm32: add oversampling support

On Thu, Apr 24, 2025 at 6:22 PM Olivier Moysan
<olivier.moysan@...s.st.com> wrote:
>
> Add oversampling support for STM32H7, STM32MP15 & STM32MP13.
> STM32F4 ADC has no oversampling feature.
>
> The current support of the oversampling feature aims at increasing the
> data SNR, without changing the data resolution.
> As the oversampling by itself increases data resolution, a right shift
> is applied to keep the initial resolution.
> Only the oversampling ratio corresponding to a power of two are
> supported here, to get a direct link between right shift and
> oversampling ratio. (2^n ratio <=> n right shift)
>
> The oversampling ratio is shared by all channels, whatever channel type.
> (e.g. single ended or differential).
>
> Oversampling can be configured using IIO ABI:
> - oversampling_ratio_available
> - oversampling_ratio

This version LGTM,
Reviewed-by: Andy Shevchenko <andy@...nel.org>

-- 
With Best Regards,
Andy Shevchenko