From: Rodrigo Alencar <[email protected]> Add documentation for a read-only sysfs attribute that allows to expose parent-child relationships between IIO channels.
Signed-off-by: Rodrigo Alencar <[email protected]> --- Documentation/ABI/testing/sysfs-bus-iio | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 7ef0db8dad40..96a7991c0723 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -2155,6 +2155,34 @@ 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: 7.3 +Contact: [email protected] +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 + virtual or logical relationships between them. + + For example, an IIO device may expose a primary output channel as + "out_voltage0" together with a set of profile-based or mode-based + subchannels used to configure or compose the output signal. These + subchannels may carry common attributes such as frequency, phase, etc. + They do not represent physical outputs, but rather logical/virtual + channels grouping configurations that affect the primary output. + Each subchannel exposes a <dir>_<type>[Y]_parent attribute reading + "out_voltage0", allowing userspace to group controls under the output + channel they belong to rather than treating them as unrelated top-level + channels. + What: /sys/bus/iio/devices/iio:deviceX/in_frequencyY_raw What: /sys/bus/iio/devices/iio:deviceX/out_frequencyY_raw KernelVersion: 7.3 -- 2.43.0
