linux-kernel - Re: [PATCH v3 4/4] Documentation: ABI: iio: add sinc4+lp

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Message-ID: <aJi579-FQwLtWnVF@debian-BULLSEYE-live-builder-AMD64>
Date: Sun, 10 Aug 2025 12:25:35 -0300
From: Marcelo Schmitt <marcelo.schmitt1@...il.com>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc: jic23@...nel.org, robh@...nel.org, conor+dt@...nel.org,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v3 4/4] Documentation: ABI: iio: add sinc4+lp

On 08/08, Antoniu Miclaus wrote:
> Add new filter type to the sysfs-bus-iio ABI documentation:
> - "sinc4+lp" for Sinc4 + Low Pass Filter
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---
> changes in v3:
>  - change from "sinc4+iir" to "sinc4+lp" for better generic naming
>  - remove "dsp" filter type
>  Documentation/ABI/testing/sysfs-bus-iio | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 28f51e4cc367..caafdd88c601 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -2309,6 +2309,7 @@ Description:
>  		* "sinc5+pf1" - Sinc5 + device specific Post Filter 1.
>  		* "wideband" - filter with wideband low ripple passband
>  		  and sharp transition band.
> +		* "sinc4+lp" - Sinc4 + Low Pass Filter.
>  
Not entering the discussion about what would be a proper name for the filter but,
since we had a patch putting filter ABI doc in alphabetical order.
https://lore.kernel.org/linux-iio/20250710-iio-adc-ad7137-add-filter-support-v1-4-acffe401c4d2@baylibre.com/
I guess we keep the docs organized by adding "sinc4+lp" between "sinc4"
and "sinc4+sinc1" (if keeping that filter name of course).

>  What:		/sys/bus/iio/devices/iio:deviceX/filter_type
>  What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_filter_type
> -- 
> 2.43.0
> 
>