linux-kernel - Re: [PATCH RESEND v3 17/17] iio: adc: ad7768-1: add low pass -3dB cutoff attribute

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Message-ID: <20250216163308.78680337@jic23-huawei>
Date: Sun, 16 Feb 2025 16:33:08 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Jonathan Santos <Jonathan.Santos@...log.com>
Cc: <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>,
 <dlechner@...libre.com>
Subject: Re: [PATCH RESEND v3 17/17] iio: adc: ad7768-1: add low pass -3dB
 cutoff attribute

On Wed, 12 Feb 2025 15:19:10 -0300
Jonathan Santos <Jonathan.Santos@...log.com> wrote:

> Ad7768-1 has a different -3db frequency multiplier depending on
> the filter type configured. The cutoff frequency also varies according
> to the current ODR.
> 
> Add a readonly low pass -3dB frequency cutoff attribute to clarify to
> the user which bandwidth is being allowed depending on the filter
> configurations.
> 
> Signed-off-by: Jonathan Santos <Jonathan.Santos@...log.com>
> ---
> v3 Changes:
> * None
> 
> v2 Changes:
> * New patch in v2.
> 
> OBS: should i drop this?
I think keep it as potentially useful and is compliant with the ABI
even if a little unusual.

Jonathan