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

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Message-ID: <20250222115111.63a1cb89@jic23-huawei>
Date: Sat, 22 Feb 2025 11:51:11 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Jonathan Santos <Jonathan.Santos@...log.com>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, lars@...afoo.de,
 Michael.Hennerich@...log.com, marcelo.schmitt@...log.com, 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 Thu, 20 Feb 2025 15:28:09 -0600
David Lechner <dlechner@...libre.com> wrote:

> 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.

That is sort of what what low ripple passband and sharp transition band means
but with technical (sounding :) terms.  The only missing bit is it isn't
a narrow pass filter.


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