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Message-Id: <20250825-mcp9600-iir-v7-3-2ba676a52589@kernel.org> Date: Mon, 25 Aug 2025 20:10:05 -0400 From: Ben Collins <bcollins@...nel.org> To: Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, Nuno Sá <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, Antoniu Miclaus <antoniu.miclaus@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com> Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, Ben Collins <bcollins@...nel.org> Subject: [PATCH v7 3/5] ABI: sysfs-bus-iio: Document "ema" filter_type Exponential Moving Average (EMA) is a first-order IIR filter. This is a common IIR algorithm used in mcp9600 and others. Signed-off-by: Ben Collins <bcollins@...nel.org> --- Documentation/ABI/testing/sysfs-bus-iio | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index df42a4040530ee96096b998bebc8a08b4fb2d78f..4e30f1db0a930f021cf07e5553d35a3feffddcc2 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -2281,6 +2281,8 @@ Description: when reading sampling and frequency related attributes of this filter, and return -EINVAL when trying to write these attributes. + * "ema" - Exponential Moving Average (EMA) is a first-order + Infinite Impulse Response (IIR) filter. * "sinc1" - The digital sinc1 filter. Fast 1st conversion time. Poor noise performance. * "sinc3" - The digital sinc3 filter. Moderate 1st -- 2.39.5
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