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

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Message-ID: <20250426151552.10aaee38@jic23-huawei>
Date: Sat, 26 Apr 2025 15:15:52 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Olivier Moysan <olivier.moysan@...s.st.com>
Cc: 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, 24 Apr 2025 17:16:03 +0200
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
>
Applied to the togreg branch of iio.git. Initially pushed out as testing
to let 0-day have a first poke at it.

Thanks,

Jonathan