[PATCH v6 03/16] iio: ABI: 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 | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index d9c4e3b53f29..e0f11b39511f 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -2154,6 +2154,23 @@ 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
+What:		/sys/bus/iio/devices/iio:deviceX/in_currentY_parent
+What:		/sys/bus/iio/devices/iio:deviceX/out_currentY_parent
+What:		/sys/bus/iio/devices/iio:deviceX/in_altcurrentY_parent
+What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrentY_parent
+KernelVersion:	7.2
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Read-only attribute containing the sysfs name prefix of the parent
+		channel for hierarchical channel relationships (e.g. "out_altvoltage0").
+		The prefix uniquely identifies the parent channel and can be used by
+		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

-- 
2.43.0