linux-kernel - Re: [PATCH v4] iio: adc: stm32: add oversampling support

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Message-ID: <22384798-eddc-460b-87d8-8c13beeefbd7@baylibre.com>
Date: Thu, 10 Apr 2025 09:20:02 -0500
From: David Lechner <dlechner@...libre.com>
To: Olivier Moysan <olivier.moysan@...s.st.com>,
 Jonathan Cameron <jic23@...nel.org>, Nuno Sá
 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc: 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 v4] iio: adc: stm32: add oversampling support

On 4/10/25 8:58 AM, Olivier Moysan 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 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. (2exp(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
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
> 
> ---
Reviewed-by: David Lechner <dlechner@...libre.com>