diff --git a/MAINTAINERS b/MAINTAINERS
index 35f27504632d..7b1a6f2d0c9c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -448,6 +448,7 @@ R:	David Lechner <dlechner@baylibre.com>
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml
+F:	drivers/iio/adc/ad7944.c
 
 ADAFRUIT MINI I2C GAMEPAD
 M:	Anshul Dalal <anshulusr@gmail.com>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 0d9282fa67f5..555ac74889f3 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -264,6 +264,16 @@ config AD7923
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7923.
 
+config AD7944
+	tristate "Analog Devices AD7944 and similar ADCs driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices
+	  AD7944, AD7985, AD7986 ADCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad7944
+
 config AD7949
 	tristate "Analog Devices AD7949 and similar ADCs driver"
 	depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index b3c434722364..a0d69b452cca 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_AD7780) += ad7780.o
 obj-$(CONFIG_AD7791) += ad7791.o
 obj-$(CONFIG_AD7793) += ad7793.o
 obj-$(CONFIG_AD7887) += ad7887.o
+obj-$(CONFIG_AD7944) += ad7944.o
 obj-$(CONFIG_AD7949) += ad7949.o
 obj-$(CONFIG_AD799X) += ad799x.o
 obj-$(CONFIG_AD9467) += ad9467.o
diff --git a/drivers/iio/adc/ad7944.c b/drivers/iio/adc/ad7944.c
new file mode 100644
index 000000000000..d0ba4ae409c4
--- /dev/null
+++ b/drivers/iio/adc/ad7944.c
@@ -0,0 +1,413 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Analog Devices AD7944/85/86 PulSAR ADC family driver.
+ *
+ * Copyright 2024 Analog Devices, Inc.
+ * Copyright 2024 BayLibre, SAS
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/string_helpers.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define AD7944_INTERNAL_REF_MV		4096
+
+struct ad7944_timing_spec {
+	/* Normal mode max conversion time (t_{CONV}) in nanoseconds. */
+	unsigned int conv_ns;
+	/* TURBO mode max conversion time (t_{CONV}) in nanoseconds. */
+	unsigned int turbo_conv_ns;
+};
+
+struct ad7944_adc {
+	struct spi_device *spi;
+	/* Chip-specific timing specifications. */
+	const struct ad7944_timing_spec *t;
+	/* GPIO connected to CNV pin. */
+	struct gpio_desc *cnv;
+	/* Optional GPIO to enable turbo mode. */
+	struct gpio_desc *turbo;
+	/* Indicates TURBO is hard-wired to be always enabled. */
+	bool always_turbo;
+	/* Reference voltage (millivolts). */
+	unsigned int ref_mv;
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	struct {
+		union {
+			u16 u16;
+			u32 u32;
+		} raw;
+		u64 timestamp __aligned(8);
+	 } sample __aligned(IIO_DMA_MINALIGN);
+};
+
+static const struct ad7944_timing_spec ad7944_timing_spec = {
+	.conv_ns = 420,
+	.turbo_conv_ns = 320,
+};
+
+static const struct ad7944_timing_spec ad7986_timing_spec = {
+	.conv_ns = 500,
+	.turbo_conv_ns = 400,
+};
+
+struct ad7944_chip_info {
+	const char *name;
+	const struct ad7944_timing_spec *t;
+	const struct iio_chan_spec channels[2];
+};
+
+/*
+ * AD7944_DEFINE_CHIP_INFO - Define a chip info structure for a specific chip
+ * @_name: The name of the chip
+ * @_t: The timing specification for the chip
+ * @_bits: The number of bits in the conversion result
+ * @_diff: Whether the chip is true differential or not
+ */
+#define AD7944_DEFINE_CHIP_INFO(_name, _t, _bits, _diff)		\
+static const struct ad7944_chip_info _name##_chip_info = {		\
+	.name = #_name,							\
+	.t = &_t##_timing_spec,						\
+	.channels = {							\
+		{							\
+			.type = IIO_VOLTAGE,				\
+			.indexed = 1,					\
+			.differential = _diff,				\
+			.channel = 0,					\
+			.channel2 = _diff ? 1 : 0,			\
+			.scan_index = 0,				\
+			.scan_type.sign = _diff ? 's' : 'u',		\
+			.scan_type.realbits = _bits,			\
+			.scan_type.storagebits = _bits > 16 ? 32 : 16,	\
+			.scan_type.endianness = IIO_CPU,		\
+			.info_mask_separate = BIT(IIO_CHAN_INFO_RAW)	\
+					| BIT(IIO_CHAN_INFO_SCALE),	\
+		},							\
+		IIO_CHAN_SOFT_TIMESTAMP(1),				\
+	},								\
+}
+
+/* pseudo-differential with ground sense */
+AD7944_DEFINE_CHIP_INFO(ad7944, ad7944, 14, 0);
+AD7944_DEFINE_CHIP_INFO(ad7985, ad7944, 16, 0);
+/* fully differential */
+AD7944_DEFINE_CHIP_INFO(ad7986, ad7986, 18, 1);
+
+/*
+ * ad7944_4wire_mode_conversion - Perform a 4-wire mode conversion and acquisition
+ * @adc: The ADC device structure
+ * @chan: The channel specification
+ * Return: 0 on success, a negative error code on failure
+ *
+ * Upon successful return adc->sample.raw will contain the conversion result.
+ */
+static int ad7944_4wire_mode_conversion(struct ad7944_adc *adc,
+					const struct iio_chan_spec *chan)
+{
+	unsigned int t_conv_ns = adc->always_turbo ? adc->t->turbo_conv_ns
+						   : adc->t->conv_ns;
+	struct spi_transfer xfers[] = {
+		{
+			/*
+			 * NB: can get better performance from some SPI
+			 * controllers if we use the same bits_per_word
+			 * in every transfer.
+			 */
+			.bits_per_word = chan->scan_type.realbits,
+			/*
+			 * CS has to be high for full conversion time to avoid
+			 * triggering the busy indication.
+			 */
+			.cs_off = 1,
+			.delay = {
+				.value = t_conv_ns,
+				.unit = SPI_DELAY_UNIT_NSECS,
+			},
+
+		},
+		{
+			.rx_buf = &adc->sample.raw,
+			.len = BITS_TO_BYTES(chan->scan_type.storagebits),
+			.bits_per_word = chan->scan_type.realbits,
+		},
+	};
+	int ret;
+
+	/*
+	 * In 4-wire mode, the CNV line is held high for the entire conversion
+	 * and acquisition process.
+	 */
+	gpiod_set_value_cansleep(adc->cnv, 1);
+	ret = spi_sync_transfer(adc->spi, xfers, ARRAY_SIZE(xfers));
+	gpiod_set_value_cansleep(adc->cnv, 0);
+
+	return ret;
+}
+
+static int ad7944_single_conversion(struct ad7944_adc *adc,
+				    const struct iio_chan_spec *chan,
+				    int *val)
+{
+	int ret;
+
+	ret = ad7944_4wire_mode_conversion(adc, chan);
+	if (ret)
+		return ret;
+
+	if (chan->scan_type.storagebits > 16)
+		*val = adc->sample.raw.u32;
+	else
+		*val = adc->sample.raw.u16;
+
+	if (chan->scan_type.sign == 's')
+		*val = sign_extend32(*val, chan->scan_type.realbits - 1);
+
+	return IIO_VAL_INT;
+}
+
+static int ad7944_read_raw(struct iio_dev *indio_dev,
+			   const struct iio_chan_spec *chan,
+			   int *val, int *val2, long info)
+{
+	struct ad7944_adc *adc = iio_priv(indio_dev);
+	int ret;
+
+	switch (info) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		ret = ad7944_single_conversion(adc, chan, val);
+		iio_device_release_direct_mode(indio_dev);
+		return ret;
+
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_VOLTAGE:
+			*val = adc->ref_mv;
+
+			if (chan->scan_type.sign == 's')
+				*val2 = chan->scan_type.realbits - 1;
+			else
+				*val2 = chan->scan_type.realbits;
+
+			return IIO_VAL_FRACTIONAL_LOG2;
+		default:
+			return -EINVAL;
+		}
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info ad7944_iio_info = {
+	.read_raw = &ad7944_read_raw,
+};
+
+static irqreturn_t ad7944_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ad7944_adc *adc = iio_priv(indio_dev);
+	int ret;
+
+	ret = ad7944_4wire_mode_conversion(adc, &indio_dev->channels[0]);
+	if (ret)
+		goto out;
+
+	iio_push_to_buffers_with_timestamp(indio_dev, &adc->sample.raw,
+					   pf->timestamp);
+
+out:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static const char * const ad7944_power_supplies[] = {
+	"avdd",	"dvdd",	"bvdd", "vio"
+};
+
+static void ad7944_ref_disable(void *ref)
+{
+	regulator_disable(ref);
+}
+
+static int ad7944_probe(struct spi_device *spi)
+{
+	const struct ad7944_chip_info *chip_info;
+	struct iio_dev *indio_dev;
+	struct ad7944_adc *adc;
+	bool have_refin = false;
+	struct regulator *ref;
+	int ret;
+
+	/*
+	 * driver currently only supports the conventional "4-wire" mode and
+	 * not other special wiring configurations.
+	 */
+	if (device_property_present(&spi->dev, "adi,spi-mode"))
+		return dev_err_probe(&spi->dev, -EINVAL,
+				     "adi,spi-mode is not currently supported\n");
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	adc = iio_priv(indio_dev);
+	adc->spi = spi;
+
+	chip_info = spi_get_device_match_data(spi);
+	if (!chip_info)
+		return dev_err_probe(&spi->dev, -EINVAL, "no chip info\n");
+
+	adc->t = chip_info->t;
+
+	/*
+	 * Some chips use unusual word sizes, so check now instead of waiting
+	 * for the first xfer.
+	 */
+	if (!spi_is_bpw_supported(spi, chip_info->channels[0].scan_type.realbits))
+		return dev_err_probe(&spi->dev, -EINVAL,
+				"SPI host does not support %d bits per word\n",
+				chip_info->channels[0].scan_type.realbits);
+
+	ret = devm_regulator_bulk_get_enable(&spi->dev,
+					     ARRAY_SIZE(ad7944_power_supplies),
+					     ad7944_power_supplies);
+	if (ret)
+		return dev_err_probe(&spi->dev, ret,
+				     "failed to get and enable supplies\n");
+
+	/*
+	 * Sort out what is being used for the reference voltage. Options are:
+	 * - internal reference: neither REF or REFIN is connected
+	 * - internal reference with external buffer: REF not connected, REFIN
+	 *   is connected
+	 * - external reference: REF is connected, REFIN is not connected
+	 */
+
+	ref = devm_regulator_get_optional(&spi->dev, "ref");
+	if (IS_ERR(ref)) {
+		if (PTR_ERR(ref) != -ENODEV)
+			ref = NULL;
+		else
+			return dev_err_probe(&spi->dev, PTR_ERR(ref),
+					     "failed to get REF supply\n");
+	}
+
+	ret = devm_regulator_get_enable_optional(&spi->dev, "refin");
+	if (ret == 0)
+		have_refin = true;
+	else if (ret != -ENODEV)
+		return dev_err_probe(&spi->dev, ret,
+				     "failed to get and enable REFIN supply\n");
+
+	if (have_refin && ref)
+		return dev_err_probe(&spi->dev, -EINVAL,
+				     "cannot have both refin and ref supplies\n");
+
+	if (ref) {
+		ret = regulator_enable(ref);
+		if (ret)
+			return dev_err_probe(&spi->dev, ret,
+					     "failed to enable REF supply\n");
+
+		ret = devm_add_action_or_reset(&spi->dev,
+						ad7944_ref_disable, ref);
+		if (ret)
+			return ret;
+
+		ret = regulator_get_voltage(ref);
+		if (ret < 0)
+			return dev_err_probe(&spi->dev, ret,
+					     "failed to get REF voltage\n");
+
+		/* external reference */
+		adc->ref_mv = ret / 1000;
+	} else {
+		/* internal reference */
+		adc->ref_mv = AD7944_INTERNAL_REF_MV;
+	}
+
+	adc->cnv = devm_gpiod_get(&spi->dev, "cnv", GPIOD_OUT_LOW);
+	if (IS_ERR(adc->cnv))
+		return dev_err_probe(&spi->dev, PTR_ERR(adc->cnv),
+				     "failed to get CNV GPIO\n");
+
+	adc->turbo = devm_gpiod_get_optional(&spi->dev, "turbo", GPIOD_OUT_LOW);
+	if (IS_ERR(adc->turbo))
+		return dev_err_probe(&spi->dev, PTR_ERR(adc->turbo),
+				     "failed to get TURBO GPIO\n");
+
+	if (device_property_present(&spi->dev, "adi,always-turbo"))
+		adc->always_turbo = true;
+
+	if (adc->turbo && adc->always_turbo)
+		return dev_err_probe(&spi->dev, -EINVAL,
+			"cannot have both turbo-gpios and adi,always-turbo\n");
+
+	indio_dev->name = chip_info->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &ad7944_iio_info;
+	indio_dev->channels = chip_info->channels;
+	indio_dev->num_channels = ARRAY_SIZE(chip_info->channels);
+
+	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
+					      iio_pollfunc_store_time,
+					      ad7944_trigger_handler, NULL);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct of_device_id ad7944_of_match[] = {
+	{ .compatible = "adi,ad7944", .data = &ad7944_chip_info },
+	{ .compatible = "adi,ad7985", .data = &ad7985_chip_info },
+	{ .compatible = "adi,ad7986", .data = &ad7986_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ad7944_of_match);
+
+static const struct spi_device_id ad7944_spi_id[] = {
+	{ "ad7944", (kernel_ulong_t)&ad7944_chip_info },
+	{ "ad7985", (kernel_ulong_t)&ad7985_chip_info },
+	{ "ad7986", (kernel_ulong_t)&ad7986_chip_info },
+	{ }
+
+};
+MODULE_DEVICE_TABLE(spi, ad7944_spi_id);
+
+static struct spi_driver ad7944_driver = {
+	.driver = {
+		.name = "ad7944",
+		.of_match_table = ad7944_of_match,
+	},
+	.probe = ad7944_probe,
+	.id_table = ad7944_spi_id,
+};
+module_spi_driver(ad7944_driver);
+
+MODULE_AUTHOR("David Lechner <dlechner@baylibre.com>");
+MODULE_DESCRIPTION("Analog Devices AD7944 PulSAR ADC family driver");
+MODULE_LICENSE("GPL");
