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([2600:8803:e7e4:1d00:4118:1770:ecaf:ee73]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-734f6b5f697sm1541527a34.57.2025.05.19.13.15.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 May 2025 13:15:44 -0700 (PDT) Message-ID: <4843ec52-57e2-418a-b640-8e05ba60959e@baylibre.com> Date: Mon, 19 May 2025 15:15:43 -0500 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 10/11] iio: adc: ad7768-1: add filter type and oversampling ratio attributes To: 1aff0f813bb3fee55c5483be860b6885abdb81e5.1747175187.git.Jonathan.Santos@analog.com, Jonathan Santos Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, andy@kernel.org, nuno.sa@analog.com, Michael.Hennerich@analog.com, marcelo.schmitt@analog.com, jic23@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, marcelo.schmitt1@gmail.com, linus.walleij@linaro.org, brgl@bgdev.pl, lgirdwood@gmail.com, broonie@kernel.org, Pop Paul References: <1aff0f813bb3fee55c5483be860b6885abdb81e5.1747175187.git.Jonathan.Santos@analog.com> Content-Language: en-US From: David Lechner In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 5/19/25 12:13 PM, Jonathan Santos wrote: > On 05/15, Jonathan Santos wrote: ... >> + >> +/* Decimation Rate range for each filter type */ >> +static const int ad7768_dec_rate_range[][3] = { >> + [AD7768_FILTER_SINC5] = { 8, 8, 1024 }, >> + [AD7768_FILTER_SINC3] = { 32, 32, 163840 }, >> + [AD7768_FILTER_WIDEBAND] = { 32, 32, 1024 }, >> + [AD7768_FILTER_SINC3_REJ60] = { 32, 32, 163840 }, >> +}; >> + > > Since we're still discussing some points — is the `step` in > `[min step max]` for the IIO range additive or multiplicative? It is not > clear on documentation, maybe on purpose or I have missed something. > > Here, decimation/OSR doubles from 8 or 32 for SINC5/WIDEBAND, and is a > multiple of 32 for SINC3. So I'm still unsure how to represent this to be > clear to the user. Sounds to me like sinc5/wideband should be lists instead of ranges. It is only 6 values.