[PATCH v4 7/7] Documentation: ABI: testing: add common ABI file for iio/frequency

Rodrigo Alencar via B4 Relay
2026-01-16T14:32:39Z

From: Rodrigo Alencar <rodrigo.alencar@analog.com>

Add ABI documentation file for PLL/DDS devices with frequency_resolution
sysfs entry attribute used by ADF4350 and ADF41513

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
---
Documentation/ABI/testing/sysfs-bus-iio-frequency | 11 +++++++++++
MAINTAINERS | 1 +
2 files changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-frequency b/Documentation/ABI/testing/sysfs-bus-iio-frequency
new file mode 100644
index 000000000000..1ce8ae578fd6
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-frequency
@@ -0,0 +1,11 @@
+What: /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency_resolution
+KernelVersion: 6.20
+Contact: linux-iio@vger.kernel.org
+Description:
+ Stores channel Y frequency resolution/channel spacing in Hz for PLL
+ devices. The given value directly influences the operating mode when
+ fractional-N synthesis is required, as it derives values for
+ configurable modulus parameters used in the calculation of the output
+ frequency. It is assumed that the algorithm that is used to compute
+ the various dividers, is able to generate proper values for multiples
+ of channel spacing.
diff --git a/MAINTAINERS b/MAINTAINERS
index e61619af9248..46a88498cc58 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1623,6 +1623,7 @@ M: Rodrigo Alencar <rodrigo.alencar@analog.com>
L: linux-iio@vger.kernel.org
S: Supported
W: https://ez.analog.com/linux-software-drivers
+F: Documentation/ABI/testing/sysfs-bus-iio-frequency
F: Documentation/devicetree/bindings/iio/frequency/adi,adf41513.yaml
F: Documentation/iio/adf41513.rst
F: drivers/iio/frequency/adf41513.c

--
2.43.0