linux-kernel - [PATCH 00/15] Add SPI offload support to AD4030

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Message-ID: <cover.1756511030.git.marcelo.schmitt@analog.com>
Date: Fri, 29 Aug 2025 21:39:27 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-spi@...r.kernel.org>
CC: <jic23@...nel.org>, <Michael.Hennerich@...log.com>, <nuno.sa@...log.com>,
        <eblanc@...libre.com>, <dlechner@...libre.com>, <andy@...nel.org>,
        <corbet@....net>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <broonie@...nel.org>,
        <Jonathan.Cameron@...wei.com>, <andriy.shevchenko@...ux.intel.com>,
        <ahaslam@...libre.com>, <marcelo.schmitt1@...il.com>
Subject: [PATCH 00/15] Add SPI offload support to AD4030

Hello,

This patch series add support for high sample rate data acquisition with AD4030
and similar devices. The last couple patches in the series add support for
ADAQ4216 and ADAQ4224 which are similar to AD4030, but have a PGA in front of
the ADC input.

Most of the code is for SPI offload support is based on work from Sergiu
Cuciurean, Nuno Sa, Axel Haslam, and Trevor Gamblin. Thus, the SPI offload and
related patches come with many co-developed-by tags. I also draw inspiration
from other drivers supporting SPI offload, many of them written by David Lechner.

The patches to the SPI subsystem are from Axel Haslam and I only signed them to
indicate I'm moving them forward.

The patches with updates to device tree are introduced before the patches that
use each specific change.

ADAQ PGA device tree doc and driver handling was inspired on AD7191 dt-binding
and driver.

The code was tested on a remote setup with ADAQ4216 connected to a ZedBoard
running Linux kernel 6.17.0-rc1 built from IIO tree testing branch.

Axel Haslam (2):
  spi: offload: types: add offset parameter
  spi: spi-offload-trigger-pwm: Use duty offset

Marcelo Schmitt (13):
  iio: adc: ad4030: Fix _scale for when oversampling is enabled
  dt-bindings: iio: adc: adi,ad4030: Reference spi-peripheral-props
  Documentation: iio: ad4030: Add double PWM SPI offload doc
  dt-bindings: iio: adc: adi,ad4030: Add PWM
  iio: adc: ad4030: Add SPI offload support
  dt-bindings: iio: adc: adi,ad4030: Add 4-lane per channel bus width
    option
  iio: adc: ad4030: Support multiple data lanes per channel
  dt-bindings: iio: adc: adi,ad4030: Add adi,clock-mode
  iio: adc: ad4030: Add clock mode option parse and setup
  dt-bindings: iio: adc: adi,ad4030: Add adi,dual-data-rate
  iio: adc: ad4030: Enable dual data rate
  dt-bindings: iio: adc: adi,ad4030: Add ADAQ4216 and ADAQ4224
  iio: adc: ad4030: Add support for ADAQ4216 and ADAQ4224

 .../bindings/iio/adc/adi,ad4030.yaml          |  86 ++-
 Documentation/iio/ad4030.rst                  |  29 +
 drivers/iio/adc/Kconfig                       |   2 +
 drivers/iio/adc/ad4030.c                      | 704 +++++++++++++++++-
 drivers/spi/spi-offload-trigger-pwm.c         |   5 +-
 include/linux/spi/offload/types.h             |   1 +
 6 files changed, 792 insertions(+), 35 deletions(-)

base-commit: 91812d3843409c235f336f32f1c37ddc790f1e03
-- 
2.39.2