linux-kernel - [PATCH v2 0/2] Subject: [PATCH v1 0/3] iio: dac: Add support for MAX22007 DAC

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Message-ID: <20260108-max22007-dev-v2-0-2506c738784f@analog.com>
Date: Thu, 8 Jan 2026 13:58:22 +0100
From: Janani Sunil <janani.sunil@...log.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich
	<Michael.Hennerich@...log.com>,
        Alexandru Ardelean
	<alexandru.ardelean@...log.com>,
        Jonathan Cameron <jic23@...nel.org>, Rob
 Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor
 Dooley <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>
CC: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <jan.sun97@...il.com>, Janani Sunil <janani.sunil@...log.com>
Subject: [PATCH v2 0/2] Subject: [PATCH v1 0/3] iio: dac: Add support for
 MAX22007 DAC

This patch series introduces support for the Analog Devices MAX22007, a
quad-channel, 12-bit digital-to-analog converter (DAC) with integrated
precision output amplifiers and configurable voltage/current output capability.

**Device Overview:**
The MAX22007 features four independent DAC channels that can each be configured
for either voltage output (0-12.5V) or current output (0-25mA) mode. The device
communicates via SPI interface with built-in CRC8 error checking for data integrity.

**Features Implemented:**
- Support for all 4 DAC channels with 12-bit resolution
- Per-channel voltage/current mode configuration via device tree
  property `adi,ch-func = [voltage, current]`
- Independent power control for each channel (attribute)
- Hardware reset support via GPIO (during probe)
- CRC8 error checking for SPI communication

**Patch Summary:**
1. dt-bindings: Binding documentation with channel configuration
2. driver: Implement IIO DAC driver

**Testing:**
The driver was hardware tested on a Raspberry Pi4 on top of v6.12.y
kernel using the MAX22007EVKIT evaluation board.

Janani Sunil (3):

dt-bindings: iio: dac: Add max22007
iio: dac: Add MAX22007 DAC driver support
---
To: Lars-Peter Clausen <lars@...afoo.de>
To: Michael Hennerich <Michael.Hennerich@...log.com>
To: Alexandru Ardelean <alexandru.ardelean@...log.com>
To: Jonathan Cameron <jic23@...nel.org>
To: Rob Herring <robh@...nel.org>
To: Krzysztof Kozlowski <krzk+dt@...nel.org>
To: Conor Dooley <conor+dt@...nel.org>
To: Jonathan Corbet <corbet@....net>
Cc: linux-iio@...r.kernel.org
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-doc@...r.kernel.org
Cc: jan.sun97@...il.com
Signed-off-by: Janani Sunil <janani.sunil@...log.com>

---
Changes in v2:
- Wrap commit messages as per coding guidelines
- Removed all driver references from the hardware
- Update property description for reset-gpio
- Removed allOf
- Added minimum/maximum limits for channel number in the devicetree
  binding
- Replaced adi,type with adi,ch-func.
- Added reference to required supplies in the binding, configured them
  in the driver
- Channels are not a required property anymore.
- Replaced instances of 'channel' in macros to just 'ch'
- Added trailing commas wherever necessary, removed them as per comments
- Add explicit values for enum- max22007_channel_power
- Replace channel spec structure member 'iio_chan' with 'iio_chans'
- Use spi_write_then_read() API in the max22007_spi_read() API
- Check for reg_size ==1 and hardcode the size otherwise
- Wrap lines in the driver to 80 characters
- Update in-line comment on the resolution
- Separate declarations with assignment, from the ones that don't
- Update the usage of channel template
- Add a local device descriptor to point to the SPI device
- Add a transition of the Reset GPIO from low to high in the probe
- Make use of regmap_set_bits() instead of regmap_update_bits during CRC
  Enable function call.
- Remove the documentation commit, as it is not needed anymore.
- Link to v1: https://lore.kernel.org/r/20251219-max22007-dev-v1-0-242da2c2b868@analog.com

---
Janani Sunil (2):
      dt-bindings: iio: dac: Add max22007
      iio: dac: Add MAX22007 DAC driver support

 .../devicetree/bindings/iio/dac/adi,max22007.yaml  | 136 ++++++
 MAINTAINERS                                        |   8 +
 drivers/iio/dac/Kconfig                            |  13 +
 drivers/iio/dac/Makefile                           |   1 +
 drivers/iio/dac/max22007.c                         | 507 +++++++++++++++++++++
 5 files changed, 665 insertions(+)
---
base-commit: a7b10f0963c651a6406d958a5f64b9c5594f84da
change-id: 20251219-max22007-dev-1aaf08db7890

Best regards,
-- 
Janani Sunil <janani.sunil@...log.com>