linux-kernel - Re: [PATCH v2 4/5] Documentation: ABI: iio: add sinc4+iir and dsp types

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Message-ID: <20250727142736.3b34afe6@jic23-huawei>
Date: Sun, 27 Jul 2025 14:27:36 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc: <robh@...nel.org>, <conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
 <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/5] Documentation: ABI: iio: add sinc4+iir and dsp
 types

On Mon, 21 Jul 2025 14:24:44 +0300
Antoniu Miclaus <antoniu.miclaus@...log.com> wrote:

> Add two new filter types to the sysfs-bus-iio ABI documentation:
> - "sinc4+iir" for Sinc4 + IIR Low Pass Filter
> - "dsp" for Digital Signal Processor filtering
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---
>  new in v2.
>  Documentation/ABI/testing/sysfs-bus-iio | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 0948611227a8..9f51aff4c3e8 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -2337,6 +2337,8 @@ Description:
>  		* "sinc5+pf1" - Sinc5 + device specific Post Filter 1.
>  		* "wideband" - filter with wideband low ripple passband
>  		  and sharp transition band.
> +		* "sinc4+iir" - Sinc4 + IIR Low Pass Filter.

The fact it's IIR doesn't really tell us much other than the particular design methodology.
Maybe sinc4+lp is more generic?  I'd like others to give inputs on this though before
we choose!

J


> +		* "dsp" - Digital Signal Processor filtering.
>  
>  What:		/sys/bus/iio/devices/iio:deviceX/filter_type
>  What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_filter_type