[PATCH v6 3/3] docs: iio: add AD7191

Alisa-Dariana Roman
2025-02-28T14:13:57Z

Add documentation for AD7191 driver.

Signed-off-by: Alisa-Dariana Roman <alisa.roman@analog.com>
---
Documentation/iio/ad7191.rst | 119 +++++++++++++++++++++++++++++++++++
Documentation/iio/index.rst | 1 +
MAINTAINERS | 1 +
3 files changed, 121 insertions(+)
create mode 100644 Documentation/iio/ad7191.rst

diff --git a/Documentation/iio/ad7191.rst b/Documentation/iio/ad7191.rst
new file mode 100644
index 000000000000..977d4fea14b0
--- /dev/null
+++ b/Documentation/iio/ad7191.rst
@@ -0,0 +1,119 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+=============
+AD7191 driver
+=============
+
+Device driver for Analog Devices AD7191 ADC.
+
+Supported devices
+=================
+
+* `AD7191 <https://www.analog.com/AD7191>`_
+
+The AD7191 is a high precision, low noise, 24-bit Σ-Δ ADC with integrated PGA.
+It features two differential input channels, an internal temperature sensor, and
+configurable sampling rates.
+
+Devicetree
+==========
+
+Pin Configuration
+-----------------
+
+The driver supports both pin-strapped and GPIO-controlled configurations for ODR
+(Output Data Rate) and PGA (Programmable Gain Amplifier) settings. These
+configurations are mutually exclusive - you must use either pin-strapped or GPIO
+control for each setting, not both.
+
+ODR Configuration
+^^^^^^^^^^^^^^^^^
+
+The ODR can be configured either through GPIO control or pin-strapping:
+
+- When using GPIO control, specify the "odr-gpios" property in the device tree
+- For pin-strapped configuration, specify the "adi,odr-value" property in the
+ device tree
+
+Available ODR settings:
+
+ - 120 Hz (ODR1=0, ODR2=0)
+ - 60 Hz (ODR1=0, ODR2=1)
+ - 50 Hz (ODR1=1, ODR2=0)
+ - 10 Hz (ODR1=1, ODR2=1)
+
+PGA Configuration
+^^^^^^^^^^^^^^^^^
+
+The PGA can be configured either through GPIO control or pin-strapping:
+
+- When using GPIO control, specify the "pga-gpios" property in the device tree
+- For pin-strapped configuration, specify the "adi,pga-value" property in the
+ device tree
+
+Available PGA gain settings:
+
+ - 1x (PGA1=0, PGA2=0)
+ - 8x (PGA1=0, PGA2=1)
+ - 64x (PGA1=1, PGA2=0)
+ - 128x (PGA1=1, PGA2=1)
+
+Clock Configuration
+-------------------
+
+The AD7191 supports both internal and external clock sources:
+
+- When CLKSEL pin is tied LOW: Uses internal 4.92MHz clock (no clock property
+ needed)
+- When CLKSEL pin is tied HIGH: Requires external clock source
+ - Can be a crystal between MCLK1 and MCLK2 pins
+ - Or a CMOS-compatible clock driving MCLK2 pin
+ - Must specify the "clocks" property in device tree when using external clock
+
+SPI Interface Requirements
+--------------------------
+
+The AD7191 has specific SPI interface requirements:
+
+- The DOUT/RDY output is dual-purpose and requires SPI bus locking
+- DOUT/RDY must be connected to an interrupt-capable GPIO
+- The SPI controller's chip select must be connected to the PDOWN pin of the ADC
+- When CS (PDOWN) is high, the device powers down and resets internal circuitry
+- SPI mode 3 operation (CPOL=1, CPHA=1) is required
+
+Power Supply Requirements
+-------------------------
+
+The device requires the following power supplies:
+
+- AVdd: Analog power supply
+- DVdd: Digital power supply
+- Vref: Reference voltage supply (external)
+
+All power supplies must be specified in the device tree.
+
+Channel Configuration
+=====================
+
+The device provides three channels:
+
+1. Temperature Sensor
+ - 24-bit unsigned
+ - Internal temperature measurement
+ - Temperature in millidegrees Celsius
+
+2. Differential Input (AIN1-AIN2)
+ - 24-bit unsigned
+ - Differential voltage measurement
+ - Configurable gain via PGA
+
+3. Differential Input (AIN3-AIN4)
+ - 24-bit unsigned
+ - Differential voltage measurement
+ - Configurable gain via PGA
+
+Buffer Support
+==============
+
+This driver supports IIO triggered buffers. See Documentation/iio/iio_devbuf.rst
+for more information about IIO triggered buffers.
diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst
index 2d334be2b7f2..edc984a38b3b 100644
--- a/Documentation/iio/index.rst
+++ b/Documentation/iio/index.rst
@@ -21,6 +21,7 @@ Industrial I/O Kernel Drivers
ad4000
ad4030
ad4695
+ ad7191
ad7380
ad7606
ad7625
diff --git a/MAINTAINERS b/MAINTAINERS
index 87c491975ced..0547a3bb528c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1352,6 +1352,7 @@ L: linux-iio@vger.kernel.org
S: Supported
W: https://ez.analog.com/linux-software-drivers
F: Documentation/devicetree/bindings/iio/adc/adi,ad7191.yaml
+F: Documentation/iio/ad7191.rst
F: drivers/iio/adc/ad7191.c

ANALOG DEVICES INC AD7192 DRIVER
--
2.43.0