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

[David Lechner]

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@xxxxxxxxxxx>
> Signed-off-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
> 
> ---
Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>