linux-kernel - [PATCH 2/2] Documentation: ABI: add oversampling frequency in sysfs-bus-iio

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Message-ID: <20250321-abi-oversampling-events-frequency-v1-2-794c1ab2f079@analog.com>
Date: Fri, 21 Mar 2025 15:50:02 +0100
From: Jorge Marques <jorge.marques@...log.com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>
CC: <dlechner@...libre.com>, <Michael.Hennerich@...log.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jorge Marques
	<jorge.marques@...log.com>
Subject: [PATCH 2/2] Documentation: ABI: add oversampling frequency in
 sysfs-bus-iio

Some devices have an internal clock used to space out the conversion
trigger for the oversampling filter,
Consider an ADC with conversion and data ready pins topology:

  Sampling trigger |       |       |       |       |
  ADC conversion   ++++    ++++    ++++    ++++    ++++
  ADC data ready      *       *       *       *       *

With the oversampling frequency, conversions can be evenly space between
the sampling edge:

  Sampling trigger |       |       |       |       |
  ADC conversion   + + + + + + + + + + + + + + + + + + + +
  ADC data ready         *       *       *       *       *

Signed-off-by: Jorge Marques <jorge.marques@...log.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 33c09c4ac60a4feec82308461643134f5ba84b66..2317bacf6a2884691a08725d6f01d18555a96227 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -139,6 +139,23 @@ Contact:	linux-iio@...r.kernel.org
 Description:
 		Hardware dependent values supported by the oversampling filter.
 
+What:		/sys/bus/iio/devices/iio:deviceX/oversampling_frequency
+KernelVersion:	6.15
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Some devices have internal clocks for the ADC oversampling.
+		Sets the resulting sampling frequency to trigger a conversion
+		used by the oversampling filter.
+		Can be used to evenly space conversion between the sampling edge
+		on some devices.
+
+What:		/sys/bus/iio/devices/iio:deviceX/oversampling_frequency_available
+KernelVersion:	6.15
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Hardware dependent values supported by the oversampling
+		frequency.
+
 What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_i_raw

-- 
2.48.1