linux-kernel - Re: [PATCH v4 06/17] Documentation: ABI: add wideband filter type to sysfs-bus-iio

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Message-ID: <20250308132037.69999683@jic23-huawei>
Date: Sat, 8 Mar 2025 13:20:37 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Marcelo Schmitt <marcelo.schmitt1@...il.com>
Cc: Jonathan Santos <Jonathan.Santos@...log.com>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-gpio@...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, linus.walleij@...aro.org, brgl@...ev.pl,
 lgirdwood@...il.com, broonie@...nel.org, dlechner@...libre.com,
 jonath4nns@...il.com
Subject: Re: [PATCH v4 06/17] Documentation: ABI: add wideband filter type
 to sysfs-bus-iio

On Fri, 7 Mar 2025 09:45:13 -0300
Marcelo Schmitt <marcelo.schmitt1@...il.com> wrote:

> On 03/06, 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>
> > ---  
> 
> LGTM
> 
> Reviewed-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
> 
> FWIW, ADAQ7768-1 datasheet provides more info about what wideband should mean
> for these devices.
> "The wideband filter offers a filter profile similar to
> an ideal brick wall filter, making it ideal for frequency analysis."
> The proposed doc seems to portray that to some extent.

Always a bit tricky to come up with filter docs that are specific
enough but not too specific as to be useless for other devices.
I think this is a reasonable balance.

Applied (note I haven't picked up any of the dt bindings in last
few patches yet as all are somewhat dependent on the trigger-sources
one by context at least!)

Jonathan

> 
> > v4 Changes:
> > * None.
> > 
> > v3 Changes:
> > * None, since we still did not agree on a better name for this filter type.
> > 
> > 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.
> >  
> >  What:		/sys/.../events/in_proximity_thresh_either_runningperiod
> >  KernelVersion:	6.6
> > -- 
> > 2.34.1
> >