[PATCH v5 04/13] Documentation: ABI: testing: add parent entry for iio channels

[Rodrigo Alencar via B4 Relay]

From: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>

Add documentation for a read-only sysfs attribute that allows to expose
parent-child relationships between IIO channels.

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-bus-iio | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 925a33fd309a..399944974e34 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -2118,6 +2118,19 @@ Description:
 		specific attributes. This is useful for userspace to be able to
 		better identify an individual channel.
 
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_parent
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_parent
+What:		/sys/bus/iio/devices/iio:deviceX/in_altvoltageY_parent
+What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_parent
+KernelVersion:	7.1
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Read-only attribute containing the label of the parent channel
+		for hierarchical channel relationships. Only present on channels
+		that have a parent channel with a valid label. This is useful for
+		userspace to organize channels in tree-like structures that reflects
+		the physical or logical relationships between them.
+
 What:		/sys/bus/iio/devices/iio:deviceX/in_phaseY_raw
 KernelVersion:	4.18
 Contact:	linux-iio@xxxxxxxxxxxxxxx

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2.43.0