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Mon, 18 Aug 2025 14:04:41 -0700 (PDT) Received: from JSANTO12-L01.ad.analog.com ([189.79.20.14]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3c07487986fsm1013912f8f.1.2025.08.18.14.04.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Aug 2025 14:04:41 -0700 (PDT) Date: Mon, 18 Aug 2025 18:04:35 -0300 From: Jonathan Santos To: Jonathan Cameron Cc: Krzysztof Kozlowski , Jonathan Santos , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Michael.Hennerich@analog.com, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Subject: Re: [PATCH 1/4] dt-bindings: iio: adc: ad7768-1: add new supported parts Message-ID: Reply-To: 20250816141220.0dd8d68f@jic23-huawei References: <8c27b00c-5b80-400f-8538-b9ad96fd5feb@kernel.org> <20250816141220.0dd8d68f@jic23-huawei> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250816141220.0dd8d68f@jic23-huawei> On 08/16, Jonathan Cameron wrote: > On Thu, 14 Aug 2025 08:03:23 +0200 > Krzysztof Kozlowski 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@kernel.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. > Yes, it would be, but the here it is 1000x larger than the actual value (1/1000 V/V). I don't see another unit in property-units.yaml for this specifc case. Maybe using -milli suffix like in 'adi,ad4000.yaml' and 'adi,ad7380.yaml'? > > > > Best regards, > > Krzysztof > >