linux-kernel - [PATCH v1 0/2] Add MAX22530-MAX22532 ADC Support

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Message-Id: <cover.1756115378.git.jain.abhinav177@gmail.com>
Date: Tue, 26 Aug 2025 02:54:50 +0530
From: Abhinav Jain <jain.abhinav177@...il.com>
To: linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: lars@...afoo.de,
	Michael.Hennerich@...log.com,
	alexandru.ardelean@...log.com,
	jlc23@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	Marcelo.Schmitt@...log.com,
	dumitru.ceclan@...log.com,
	Jonathan.Santos@...log.com,
	dragos.bogdan@...log.com,
	Abhinav Jain <jain.abhinav177@...il.com>
Subject: [PATCH v1 0/2] Add MAX22530-MAX22532 ADC Support

Hello iio/maintainers,

This patch series adds initial support for the Analog Devices Maxim family
of MAX22530-MAX22532 ADCs. These are galvanically isolated, 4-channel,
multiplexed, 12-bit, analog-to-digital converters (ADC) in the MAXSafe™
family product line. An integrated, isolated, DC-DC converter powers all
fieldside circuitry, and this allows field-side diagnostics even when no
input signal is present.

The first patch adds the device tree documentation for the ADC. The DT
binding has been verified with DT_BINDING_CHECK. The second patch adds the
read functionality for raw and average ADC values from registers.

The code was tested with Raspberry Pi5 and MAX22531_EVKIT_A. With the
current driver version, it is possible to do single-shot read of ADC
sample data. On a preliminary version of the max22531 driver with
debugfs_reg_access callbacks, it was also possible to read/write from/to
different device registers and obtain the expected results.

Details of the test setup can be found at
https://wiki.analog.com/resources/tools-software/linux-drivers/iio-adc/max22531

This code was developed as part of the GSoC project for Linux
Foundation. Many thanks to my mentors Marcelo Schmitt, Ceclan Dumitru,
Jonathan Santos & Dragos Bogdan for their guidance and reviews
throughout the course of this programme.

Abhinav Jain (2):
  dt-bindings: iio: adc: Add device tree binding for MAX22531 ADC
  iio: adc: Add initial support for MAX22531 ADC

 .../bindings/iio/adc/adi,max22531.yaml        |  75 +++++++
 MAINTAINERS                                   |   8 +
 drivers/iio/adc/Kconfig                       |  10 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/max22531.c                    | 191 ++++++++++++++++++
 5 files changed, 285 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,max22531.yaml
 create mode 100644 drivers/iio/adc/max22531.c

base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
-- 
2.34.1