linux-kernel - Re: [PATCH RESEND v3 06/17] Documentation: ABI: add wideband filter type to sysfs-bus-iio

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Message-ID: <42296bf2-2818-4224-9e52-d1fef59d8a76@baylibre.com>
Date: Thu, 20 Feb 2025 15:28:09 -0600
From: David Lechner <dlechner@...libre.com>
To: Jonathan Santos <Jonathan.Santos@...log.com>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: lars@...afoo.de, Michael.Hennerich@...log.com,
 marcelo.schmitt@...log.com, jic23@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, jonath4nns@...il.com,
 marcelo.schmitt1@...il.com
Subject: Re: [PATCH RESEND v3 06/17] Documentation: ABI: add wideband filter
 type to sysfs-bus-iio

On 2/12/25 12:16 PM, Jonathan Santos wrote:
> The Wideband Low Ripple filter is used for AD7768-1 Driver.
> Document wideband filter option into filter_type_available
> attribute.
> 
> Signed-off-by: Jonathan Santos <Jonathan.Santos@...log.com>
> ---
> v3 Changes:
> * None, since we still did not agree on a better name for this filter type.
> 

I'm convinced at this point that "wideband" is fine.

> v2 Changes:
> * Removed FIR mentions.
> ---
>  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 f83bd6829285..9b879e7732cd 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -2291,6 +2291,8 @@ Description:
>  		* "sinc3+pf2" - Sinc3 + device specific Post Filter 2.
>  		* "sinc3+pf3" - Sinc3 + device specific Post Filter 3.
>  		* "sinc3+pf4" - Sinc3 + device specific Post Filter 4.
> +		* "wideband" - filter with wideband low ripple passband
> +		  and sharp transition band.

The description could perhaps be made a bit more generic though
instead of using specifics from the AD7768-1 datasheet. Something
along the lines of Jonathan's 'flattish to a wide range of frequencies'
description.

>  
>  What:		/sys/.../events/in_proximity_thresh_either_runningperiod
>  KernelVersion:	6.6