[PATCH v1 3/3] Docs: iio: Add AD4134

Marcelo Schmitt
2025-11-10T12:46:15Z

Add initial documentation for the ad4134 IIO driver.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
---
Documentation/iio/ad4134.rst | 58 ++++++++++++++++++++++++++++++++++++
Documentation/iio/index.rst | 1 +
MAINTAINERS | 1 +
3 files changed, 60 insertions(+)
create mode 100644 Documentation/iio/ad4134.rst

diff --git a/Documentation/iio/ad4134.rst b/Documentation/iio/ad4134.rst
new file mode 100644
index 000000000000..fe20ec6f2132
--- /dev/null
+++ b/Documentation/iio/ad4134.rst
@@ -0,0 +1,58 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+=============
+AD4134 driver
+=============
+
+Device driver for Analog Devices Inc. AD4134 and similar ADCs.
+
+Supported devices
+=================
+
+* `AD4134 <https://www.analog.com/AD4134>`_
+* `AD7134 <https://www.analog.com/AD7134>`_
+
+Wiring connections
+------------------
+
+AD4134 and similar ADCs can operate in a few different wiring configurations.
+
+Minimum I/O mode (SPI control mode)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The minimum I/O mode wiring allows AD4134 register and data access with the
+conventional set of SPI bus lines. The hardware configuration settings for using
+AD4134 in minimum I/O mode are:
+
++----------------------------+----------------------+--------------------+
+| Pin Function | Level | Description |
++============================+======================+====================+
+| PIN/SPI | High | SPI control mode |
++----------------------------+----------------------+--------------------+
+| MODE | Low | ASRC slave mode |
++----------------------------+----------------------+--------------------+
+| DCLKIO | Low | DCLK input |
++----------------------------+----------------------+--------------------+
+| DCLKMODE | Low | Gated DCLK |
++----------------------------+----------------------+--------------------+
+
+A possible connection schema that sets AD4134 digital interface for minimum I/O
+mode is:
+
+::
+
+ IOVDD
+ +------------------------+ |
+ | PIN/SPI |<--+ +-------------+
+ | | | HOST |
+ | DCLK |<--+ | |
+ | FORMAT1/SCLK |<--+---- | SCLK |
+ | AD4134 DEC2/SDI |<--------| SDO |
+ | DEC3/SDO |-------->| SDI |
+ | ODR |<--------| GPIO |
+ | FORMAT0/CS |<--+ | |
+ | MODE |<--+ +-------------+
+ | DEC0/DCLKIO |<--+
+ | DEC1/DCLKMODE |<--+
+ +------------------------+ |
+ GND
diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst
index 315ae37d6fd4..d4ed782c93a6 100644
--- a/Documentation/iio/index.rst
+++ b/Documentation/iio/index.rst
@@ -22,6 +22,7 @@ Industrial I/O Kernel Drivers
ad3552r
ad4000
ad4030
+ ad4134
ad4695
ad7191
ad7380
diff --git a/MAINTAINERS b/MAINTAINERS
index e709ec1d6717..80ae2fd4735c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1443,6 +1443,7 @@ L: linux-iio@vger.kernel.org
S: Supported
W: https://ez.analog.com/linux-software-drivers
F: Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
+F: Documentation/iio/ad4134.rst
F: drivers/iio/adc/ad4134*

ANALOG DEVICES INC AD4170-4 DRIVER
--
2.51.0