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

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Message-Id: <20260116-adf41513-iio-driver-v4-7-dbb7d6782217@analog.com>
Date: Fri, 16 Jan 2026 14:32:26 +0000
From: Rodrigo Alencar via B4 Relay <devnull+rodrigo.alencar.analog.com@...nel.org>
To: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.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>, Jonathan Corbet <corbet@....net>, 
 Rodrigo Alencar <rodrigo.alencar@...log.com>
Subject: [PATCH v4 7/7] Documentation: ABI: testing: add common ABI file
 for iio/frequency

From: Rodrigo Alencar <rodrigo.alencar@...log.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@...log.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@...r.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@...log.com>
 L:	linux-iio@...r.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