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

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Message-ID: <8c27b00c-5b80-400f-8538-b9ad96fd5feb@kernel.org>
Date: Thu, 14 Aug 2025 08:03:23 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jonathan Santos <Jonathan.Santos@...log.com>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Michael.Hennerich@...log.com,
 jic23@...nel.org, 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 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)

Best regards,
Krzysztof