linux-kernel - [PATCH v6 1/6] Documentation: ABI: IIO: add calibconv

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Message-Id: <20250522-wip-bl-ad7606-calibration-v6-1-487b90433da0@baylibre.com>
Date: Thu, 22 May 2025 15:27:02 +0200
From: Angelo Dureghello <adureghello@...libre.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Hennerich <michael.hennerich@...log.com>, 
 devicetree@...r.kernel.org, Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v6 1/6] Documentation: ABI: IIO: add calibconv_delay
 documentation

From: Angelo Dureghello <adureghello@...libre.com>

Add new IIO calibconv_delay documentation.

The ad7606 implements a phase calibation feature, in nanoseconds.
Being this a time delay, using the conv_delay suffix.

Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index ef52c427a015cf47bb9847782e13afbee01e9f31..cd79c036b2ccdea016dcc17f4e8ac5fdb2d0e465 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -559,6 +559,30 @@ Description:
 		- a small discrete set of values like "0 2 4 6 8"
 		- a range specified as "[min step max]"
 
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_convdelay
+KernelVersion:	6.16
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Delay of start of conversion from common reference point shared
+		by all channels. Can be writable when used to compensate for
+		delay variation introduced by external filters feeding a
+		simultaneous sampling ADC.
+
+		I.e., for the ad7606 ADC series, this value is intended as a
+		configurable time delay in seconds, to correct delay introduced
+		by an optional external filtering circuit.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_convdelay_available
+KernelVersion:	6.16
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Available values of convdelay. Maybe expressed as:
+
+		- a range specified as "[min step max]"
+
+		If shared across all channels, <type>_calibconv_delay_available
+		is used.
+
 What:		/sys/bus/iio/devices/iio:deviceX/in_accel_x_calibscale
 What:		/sys/bus/iio/devices/iio:deviceX/in_accel_y_calibscale
 What:		/sys/bus/iio/devices/iio:deviceX/in_accel_z_calibscale

-- 
2.49.0