linux-kernel - Re: [PATCH 1/4] dt-bindings: iio: adc: ad7768-1: add new supported parts

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Message-ID: <20250816141220.0dd8d68f@jic23-huawei>
Date: Sat, 16 Aug 2025 14:12:20 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Jonathan Santos <Jonathan.Santos@...log.com>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Michael.Hennerich@...log.com, dlechner@...libre.com, nuno.sa@...log.com,
 andy@...nel.org, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org
Subject: Re: [PATCH 1/4] dt-bindings: iio: adc: ad7768-1: add new supported
 parts

On Thu, 14 Aug 2025 08:03:23 +0200
Krzysztof Kozlowski <krzk@...nel.org> wrote:

> On 14/08/2025 00:39, Jonathan Santos wrote:
> >>>  
> >>> +  adi,aaf-gain:
> >>> +    description: |
> >>> +      Specifies the gain of the Analog Anti-Aliasing Filter (AAF) applied to the
> >>> +      ADC input, measured in milli-units. The AAF provides additional signal  
> >>
> >> What is milli unit? Isn't gain in dB, so maybe you want mB? Quite
> >> unpopular to see mB, but we cannot use 1/100 of dB, so I could
> >> understand it.
> >>  
> > 
> > Actually, the gain is expressed in V/V, not in dB. I may have phrased it poorly, but since
> > there are fractional values like 0.364 and 0.143, I chose to represent it
> > in milli-units.  
> 
> Why your reply to is corrupted:
> "c3cf9b97-3883-4ebb-a2ed-0033adebda87@...nel.org"?
> 
> 
> What sort of unit is milli-unit? Isn't this 1/1000 of some BASE unit,
> but you do not have here a base?
> 
> I think you want just basis point if this is V/V (already in common
> property suffixes)
Nice. I didn't know about -bp.   That does sound like a good choice for ratio
stuff and here would be 100x larger actual values which is fine.

> 
> Best regards,
> Krzysztof
>