Message-ID: <f88fd2bda5b93ca0c0f8a892b501e9ff7ac1574c.1763478299.git.marcelo.schmitt@analog.com>
Date: Tue, 18 Nov 2025 14:32:43 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <jic23@...nel.org>, <nuno.sa@...log.com>, <dlechner@...libre.com>,
        <andy@...nel.org>, <Michael.Hennerich@...log.com>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <corbet@....net>,
        <cosmin.tanislav@...log.com>, <marcelo.schmitt1@...il.com>
Subject: [PATCH v2 2/3] iio: adc: Initial support for AD4134

AD4134 is a 24-bit, 4-channel, simultaneous sampling, precision
analog-to-digital converter (ADC). The device can be managed through SPI or
direct control of pin logical levels (pin control mode). The AD4134 design
also features a dedicated bus for ADC sample data output. Though, this
initial driver for AD4134 only supports usual SPI connections.

Add basic support for AD4134 that enables single-shot ADC sample read.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
---
Change log v1 -> v2:
- Squashed the driver into a single file. Dropped unneeded code and simplified.
- Used IWYU to review includes (added missing ones, removed the unneeded).
- Reworked external clock setup.
- Dropped channel dynamic scan_types.
- Factored out register read specific code to into own function to make code more clear.
- Added comments to clarify non-intuitive code snippets.
- Added trailing commas where suggested.
- Made use of USEC_PER_SEC and HZ_PER_MHZ.
- Updated according to other suggestions (mostly code style).

About the external clock handling, I personally prefer how it was in v1. For
these devices, we can't have two input clock sources connected simultaneously.
It's either a crystal or a CMOS clock, and we must have one of them. In other
words, the device will have one, and only one clock source at a time. Whether
the clock source comes from a crystal or other digital source is told by the
clock-names dt property. So we don't need to guess what type of clock we have.
We can get the correct clock according to firmware. I think that would make more
sense for ad4134 given we will have one, and necessarily one clock. The
suggested approach do work as expected, I just think it looks a bit clumsy IMHO.

CRC8 is needed because in minimum I/O mode SPI CRC is enabled and cannot be
disabled.

 MAINTAINERS              |   1 +
 drivers/iio/adc/Kconfig  |  11 +
 drivers/iio/adc/Makefile |   1 +
 drivers/iio/adc/ad4134.c | 493 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 506 insertions(+)
 create mode 100644 drivers/iio/adc/ad4134.c

diff --git a/MAINTAINERS b/MAINTAINERS
index b9029c4055e3..a1541cf3967b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1455,6 +1455,7 @@ L:	linux-iio@...r.kernel.org
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
+F:	drivers/iio/adc/ad4134.c
 
 ANALOG DEVICES INC AD4170-4 DRIVER
 M:	Marcelo Schmitt <marcelo.schmitt@...log.com>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 58da8255525e..e711a146bd23 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -99,6 +99,17 @@ config AD4130
 	  To compile this driver as a module, choose M here: the module will be
 	  called ad4130.
 
+config AD4134
+	tristate "Analog Device AD4134 ADC Driver"
+	depends on SPI
+	select REGMAP_SPI
+	select CRC8
+	help
+	  Say yes here to build support for Analog Devices AD4134 SPI analog to
+	  digital converters (ADC).
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ad4134_spi.
 
 config AD4170_4
 	tristate "Analog Device AD4170-4 ADC Driver"
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 7cc8f9a12f76..4f834b56e0f0 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_AD4000) += ad4000.o
 obj-$(CONFIG_AD4030) += ad4030.o
 obj-$(CONFIG_AD4080) += ad4080.o
 obj-$(CONFIG_AD4130) += ad4130.o
+obj-$(CONFIG_AD4134) += ad4134.o
 obj-$(CONFIG_AD4170_4) += ad4170-4.o
 obj-$(CONFIG_AD4695) += ad4695.o
 obj-$(CONFIG_AD4851) += ad4851.o
diff --git a/drivers/iio/adc/ad4134.c b/drivers/iio/adc/ad4134.c
new file mode 100644
index 000000000000..e8a2d7fa161c
--- /dev/null
+++ b/drivers/iio/adc/ad4134.c
@@ -0,0 +1,493 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2025 Analog Devices, Inc.
+ * Author: Marcelo Schmitt <marcelo.schmitt@...log.com>
+ */
+
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/crc8.h>
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/time.h>
+#include <linux/types.h>
+#include <linux/unaligned.h>
+#include <linux/units.h>
+
+#define AD4134_RESET_TIME_US			(10 * USEC_PER_SEC)
+
+#define AD4134_REG_READ_MASK			BIT(7)
+#define AD4134_SPI_MAX_XFER_LEN			3
+
+#define AD4134_EXT_CLOCK_MHZ			(48 * HZ_PER_MHZ)
+
+#define AD4134_NUM_CHANNELS			4
+#define AD4134_CHAN_PRECISION_BITS		24
+
+#define AD4134_IFACE_CONFIG_A_REG		0x00
+#define AD4134_IFACE_CONFIG_B_REG		0x01
+#define AD4134_IFACE_CONFIG_B_SINGLE_INSTR	BIT(7)
+
+#define AD4134_DEVICE_CONFIG_REG		0x02
+#define AD4134_DEVICE_CONFIG_POWER_MODE_MASK	BIT(0)
+#define AD4134_POWER_MODE_HIGH_PERF		0x1
+
+#define AD4134_SILICON_REV_REG			0x07
+#define AD4134_SCRATCH_PAD_REG			0x0A
+#define AD4134_STREAM_MODE_REG			0x0E
+#define AD4134_SDO_PIN_SRC_SEL_REG		0x10
+#define AD4134_SDO_PIN_SRC_SEL_SDO_SEL_MASK	BIT(2)
+
+#define AD4134_DATA_PACKET_CONFIG_REG		0x11
+#define AD4134_DATA_PACKET_CONFIG_FRAME_MASK	GENMASK(5, 4)
+#define AD4134_DATA_PACKET_24BIT_FRAME		0x2
+
+#define AD4134_DIG_IF_CFG_REG			0x12
+#define AD4134_DIF_IF_CFG_FORMAT_MASK		GENMASK(1, 0)
+#define AD4134_DATA_FORMAT_SINGLE_CH_MODE	0x0
+
+#define AD4134_PW_DOWN_CTRL_REG			0x13
+#define AD4134_DEVICE_STATUS_REG		0x15
+#define AD4134_ODR_VAL_INT_LSB_REG		0x16
+#define AD4134_CH3_OFFSET_MSB_REG		0x3E
+#define AD4134_AIN_OR_ERROR_REG			0x48
+
+/*
+ * AD4134 register map ends at address 0x48 and there is no register for
+ * retrieving ADC sample data. Though, to make use of Linux regmap API both
+ * for register access and sample read, we define one virtual register for each
+ * ADC channel. AD4134_CH_VREG(x) maps a channel number to it's virtual register
+ * address while AD4134_VREG_CH(x) tells which channel given the address.
+ */
+#define AD4134_CH_VREG(x)			((x) + 0x50)
+#define AD4134_VREG_CH(x)			((x) - 0x50)
+
+#define AD4134_SPI_CRC_POLYNOM			0x07
+#define AD4134_SPI_CRC_INIT_VALUE		0xA5
+static unsigned char ad4134_spi_crc_table[CRC8_TABLE_SIZE];
+
+#define AD4134_CHANNEL(_index) {						\
+	.type = IIO_VOLTAGE,							\
+	.indexed = 1,								\
+	.channel = (_index),							\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),				\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),			\
+}
+
+static const struct iio_chan_spec ad4134_chan_set[] = {
+	AD4134_CHANNEL(0),
+	AD4134_CHANNEL(1),
+	AD4134_CHANNEL(2),
+	AD4134_CHANNEL(3),
+};
+
+struct ad4134_state {
+	struct spi_device *spi;
+	struct device *dev;
+	struct regmap *regmap;
+	unsigned long sys_clk_hz;
+	struct gpio_desc *odr_gpio;
+	int refin_mv;
+	/*
+	 * DMA (thus cache coherency maintenance) requires the transfer buffers
+	 * to live in their own cache lines.
+	 */
+	u8 rx_buf[AD4134_SPI_MAX_XFER_LEN] __aligned(IIO_DMA_MINALIGN);
+	u8 tx_buf[AD4134_SPI_MAX_XFER_LEN];
+};
+
+static const struct regmap_range ad4134_regmap_rd_range[] = {
+	regmap_reg_range(AD4134_IFACE_CONFIG_A_REG, AD4134_SILICON_REV_REG),
+	regmap_reg_range(AD4134_SCRATCH_PAD_REG, AD4134_PW_DOWN_CTRL_REG),
+	regmap_reg_range(AD4134_DEVICE_STATUS_REG, AD4134_AIN_OR_ERROR_REG),
+	regmap_reg_range(AD4134_CH_VREG(0), AD4134_CH_VREG(AD4134_NUM_CHANNELS)),
+};
+
+static const struct regmap_range ad4134_regmap_wr_range[] = {
+	regmap_reg_range(AD4134_IFACE_CONFIG_A_REG, AD4134_DEVICE_CONFIG_REG),
+	regmap_reg_range(AD4134_SCRATCH_PAD_REG, AD4134_SCRATCH_PAD_REG),
+	regmap_reg_range(AD4134_STREAM_MODE_REG, AD4134_PW_DOWN_CTRL_REG),
+	regmap_reg_range(AD4134_ODR_VAL_INT_LSB_REG, AD4134_CH3_OFFSET_MSB_REG),
+};
+
+static const struct regmap_access_table ad4134_regmap_rd_table = {
+	.yes_ranges = ad4134_regmap_rd_range,
+	.n_yes_ranges = ARRAY_SIZE(ad4134_regmap_rd_range),
+};
+
+static const struct regmap_access_table ad4134_regmap_wr_table = {
+	.yes_ranges = ad4134_regmap_wr_range,
+	.n_yes_ranges = ARRAY_SIZE(ad4134_regmap_wr_range),
+};
+
+static int ad4134_calc_spi_crc(u8 inst, u8 data)
+{
+	u8 buf[] = { inst, data };
+
+	return crc8(ad4134_spi_crc_table, buf, ARRAY_SIZE(buf),
+		    AD4134_SPI_CRC_INIT_VALUE);
+}
+
+static void ad4134_prepare_spi_tx_buf(u8 inst, u8 data, u8 *buf)
+{
+	buf[0] = inst;
+	buf[1] = data;
+	buf[2] = ad4134_calc_spi_crc(inst, data);
+}
+
+static int ad4134_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct ad4134_state *st = context;
+	struct spi_transfer xfer = {
+		.tx_buf = st->tx_buf,
+		.rx_buf = st->rx_buf,
+		.len = AD4134_SPI_MAX_XFER_LEN,
+	};
+	int ret;
+
+	ad4134_prepare_spi_tx_buf(reg, val, st->tx_buf);
+
+	ret = spi_sync_transfer(st->spi, &xfer, 1);
+	if (ret)
+		return ret;
+
+	if (st->rx_buf[2] != st->tx_buf[2])
+		dev_dbg(&st->spi->dev, "reg write CRC check failed\n");
+
+	return 0;
+}
+
+static int ad4134_data_read(struct ad4134_state *st, unsigned int reg,
+			    unsigned int *val)
+{
+	unsigned int i;
+	int ret;
+
+	/*
+	 * To be able to read data from all 4 channels through a single line, we
+	 * set DOUTx output format to 0 in the digital interface config register
+	 * (0x12). With that, data from all four channels is serialized and
+	 * output on DOUT0. During probe, we also set SDO_PIN_SRC_SEL in
+	 * DEVICE_CONFIG_1 register to duplicate DOUT0 on the SDO pin. Combined,
+	 * those configurations enable ADC data read through a conventional SPI
+	 * interface. Now we read data from all channels but keep only the bits
+	 * from the requested one.
+	 */
+	for (i = 0; i < ARRAY_SIZE(ad4134_chan_set); i++) {
+		ret = spi_write_then_read(st->spi, NULL, 0, st->rx_buf,
+					  BITS_TO_BYTES(AD4134_CHAN_PRECISION_BITS));
+		if (ret)
+			return ret;
+
+		if (i != AD4134_VREG_CH(reg))
+			continue;
+
+		*val = get_unaligned_be24(st->rx_buf);
+	}
+
+	return 0;
+}
+
+static int ad4134_register_read(struct ad4134_state *st, unsigned int reg,
+				unsigned int *val)
+{
+	struct spi_transfer xfer = {
+		.tx_buf = st->tx_buf,
+		.rx_buf = st->rx_buf,
+		.len = AD4134_SPI_MAX_XFER_LEN,
+	};
+	unsigned int inst;
+	int ret;
+
+	inst = AD4134_REG_READ_MASK | reg;
+	ad4134_prepare_spi_tx_buf(inst, 0, st->tx_buf);
+
+	ret = spi_sync_transfer(st->spi, &xfer, 1);
+	if (ret)
+		return ret;
+
+	*val = st->rx_buf[1];
+
+	/* Check CRC */
+	if (st->rx_buf[2] != st->tx_buf[2])
+		dev_dbg(&st->spi->dev, "reg read CRC check failed\n");
+
+	return 0;
+}
+
+static int ad4134_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct ad4134_state *st = context;
+
+	if (reg >= AD4134_CH_VREG(0))
+		return ad4134_data_read(st, reg, val);
+
+	return ad4134_register_read(st, reg, val);
+}
+
+static const struct regmap_config ad4134_regmap_config = {
+	.reg_read = ad4134_reg_read,
+	.reg_write = ad4134_reg_write,
+	.rd_table = &ad4134_regmap_rd_table,
+	.wr_table = &ad4134_regmap_wr_table,
+	.max_register = AD4134_CH_VREG(ARRAY_SIZE(ad4134_chan_set)),
+};
+
+static int ad4134_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long info)
+{
+	struct ad4134_state *st = iio_priv(indio_dev);
+	int ret;
+
+	switch (info) {
+	case IIO_CHAN_INFO_RAW:
+		gpiod_set_value_cansleep(st->odr_gpio, 1);
+		fsleep(1);
+		gpiod_set_value_cansleep(st->odr_gpio, 0);
+		ret = regmap_read(st->regmap, AD4134_CH_VREG(chan->channel), val);
+		if (ret)
+			return ret;
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = st->refin_mv;
+		*val2 = AD4134_CHAN_PRECISION_BITS - 1;
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ad4134_debugfs_reg_access(struct iio_dev *indio_dev,
+				     unsigned int reg, unsigned int writeval,
+				     unsigned int *readval)
+{
+	struct ad4134_state *st = iio_priv(indio_dev);
+
+	if (readval)
+		return regmap_read(st->regmap, reg, readval);
+
+	return regmap_write(st->regmap, reg, writeval);
+}
+
+static int ad4134_min_io_mode_setup(struct ad4134_state *st)
+{
+	struct device *dev = &st->spi->dev;
+	int ret;
+
+	st->odr_gpio = devm_gpiod_get(dev, "odr", GPIOD_OUT_LOW);
+	if (IS_ERR(st->odr_gpio))
+		return dev_err_probe(dev, PTR_ERR(st->odr_gpio),
+				     "failed to get ODR GPIO\n");
+
+	ret = regmap_update_bits(st->regmap, AD4134_DIG_IF_CFG_REG,
+				 AD4134_DIF_IF_CFG_FORMAT_MASK,
+				 FIELD_PREP(AD4134_DIF_IF_CFG_FORMAT_MASK,
+					    AD4134_DATA_FORMAT_SINGLE_CH_MODE));
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to set single channel mode\n");
+
+	ret = regmap_set_bits(st->regmap, AD4134_SDO_PIN_SRC_SEL_REG,
+			      AD4134_SDO_PIN_SRC_SEL_SDO_SEL_MASK);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to set SDO source selection\n");
+
+	return regmap_set_bits(st->regmap, AD4134_IFACE_CONFIG_B_REG,
+			       AD4134_IFACE_CONFIG_B_SINGLE_INSTR);
+}
+
+static const struct iio_info ad4134_info = {
+	.read_raw = ad4134_read_raw,
+	.debugfs_reg_access = ad4134_debugfs_reg_access,
+};
+
+static const char * const ad4143_regulator_names[] = {
+	"avdd5", "dvdd5", "iovdd", "refin",
+	"avdd1v8", "dvdd1v8", "clkvdd",	"ldoin",
+};
+
+static int ad4134_regulator_setup(struct ad4134_state *st)
+{
+	struct device *dev = &st->spi->dev;
+	bool use_internal_ldo_regulator;
+	int ret;
+
+	/* Required regulators */
+	ret = devm_regulator_bulk_get_enable(dev, 3, ad4143_regulator_names);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to enable power supplies\n");
+
+	/* Required regulator that we need to read the voltage */
+	ret = devm_regulator_get_enable_read_voltage(dev, "refin");
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to get REFIN voltage.\n");
+
+	st->refin_mv = ret / MILLI;
+
+	/*
+	 * If ldoin is not provided, then avdd1v8, dvdd1v8, and clkvdd are
+	 * required.
+	 */
+	ret = devm_regulator_get_enable_optional(dev, "ldoin");
+	if (ret < 0 && ret != -ENODEV)
+		return dev_err_probe(dev, ret, "failed to enable ldoin supply\n");
+
+	use_internal_ldo_regulator = ret == 0;
+
+	if (!use_internal_ldo_regulator) {
+		ret = devm_regulator_get_enable(dev, "avdd1v8");
+		if (ret < 0)
+			return dev_err_probe(dev, ret,
+					     "failed to enable avdd1v8 supply\n");
+
+		ret = devm_regulator_get_enable(dev, "dvdd1v8");
+		if (ret < 0)
+			return dev_err_probe(dev, ret,
+					     "failed to enable dvdd1v8 supply\n");
+
+		ret = devm_regulator_get_enable(dev, "clkvdd");
+		if (ret < 0)
+			return dev_err_probe(dev, ret,
+					     "failed to enable clkvdd supply\n");
+	}
+
+	return 0;
+}
+
+static int ad4134_clock_select(struct ad4134_state *st)
+{
+	struct device *dev = &st->spi->dev;
+	struct clk *sys_clk;
+	int ret;
+
+	sys_clk = devm_clk_get_optional_enabled(dev, "xtal1-xtal2");
+	if (IS_ERR_OR_NULL(sys_clk)) {
+		ret = PTR_ERR_OR_ZERO(sys_clk);
+		sys_clk = devm_clk_get_enabled(dev, "clkin");
+		if (IS_ERR(sys_clk))
+			return dev_err_probe(dev, PTR_ERR(sys_clk),
+					     "failed to get xtal1-xtal2: %d, clkin: %ld\n",
+					     ret, PTR_ERR(sys_clk));
+	}
+
+	st->sys_clk_hz = clk_get_rate(sys_clk);
+	if (st->sys_clk_hz != AD4134_EXT_CLOCK_MHZ)
+		dev_warn(dev, "invalid external clock frequency %lu\n",
+			 st->sys_clk_hz);
+
+	return 0;
+}
+
+static int ad4134_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct gpio_desc *reset_gpio;
+	struct iio_dev *indio_dev;
+	struct ad4134_state *st;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	st->spi = spi;
+
+	indio_dev->name = "ad4134";
+	indio_dev->channels = ad4134_chan_set;
+	indio_dev->num_channels = ARRAY_SIZE(ad4134_chan_set);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &ad4134_info;
+
+	ret = ad4134_regulator_setup(st);
+	if (ret)
+		return ret;
+
+	ret = ad4134_clock_select(st);
+	if (ret)
+		return ret;
+
+	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(reset_gpio),
+				     "failed to find reset GPIO\n");
+
+	if (reset_gpio) {
+		fsleep(AD4134_RESET_TIME_US);
+		gpiod_set_value_cansleep(reset_gpio, 0);
+	}
+
+	crc8_populate_msb(ad4134_spi_crc_table, AD4134_SPI_CRC_POLYNOM);
+
+	st->regmap = devm_regmap_init(dev, NULL, st, &ad4134_regmap_config);
+	if (IS_ERR(st->regmap))
+		return dev_err_probe(dev, PTR_ERR(st->regmap),
+				     "failed to initialize regmap");
+
+	ret = ad4134_min_io_mode_setup(st);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to setup minimum I/O mode\n");
+
+	/* Bump precision to 24-bit */
+	ret = regmap_update_bits(st->regmap, AD4134_DATA_PACKET_CONFIG_REG,
+				 AD4134_DATA_PACKET_CONFIG_FRAME_MASK,
+				 FIELD_PREP(AD4134_DATA_PACKET_CONFIG_FRAME_MASK,
+					    AD4134_DATA_PACKET_24BIT_FRAME));
+	if (ret)
+		return ret;
+
+	/* Set high performance power mode */
+	ret = regmap_update_bits(st->regmap, AD4134_DEVICE_CONFIG_REG,
+				 AD4134_DEVICE_CONFIG_POWER_MODE_MASK,
+				 FIELD_PREP(AD4134_DEVICE_CONFIG_POWER_MODE_MASK,
+					    AD4134_POWER_MODE_HIGH_PERF));
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct spi_device_id ad4134_id[] = {
+	{ "ad4134" },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ad4134_id);
+
+static const struct of_device_id ad4134_of_match[] = {
+	{ .compatible = "adi,ad4134" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ad4134_of_match);
+
+static struct spi_driver ad4134_driver = {
+	.driver = {
+		.name = "ad4134",
+		.of_match_table = ad4134_of_match,
+	},
+	.probe = ad4134_probe,
+	.id_table = ad4134_id,
+};
+module_spi_driver(ad4134_driver);
+
+MODULE_AUTHOR("Marcelo Schmitt <marcelo.schmitt@...log.com>");
+MODULE_DESCRIPTION("Analog Devices AD4134 SPI driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_AD4134");
-- 
2.51.0

Powered by blists - more mailing lists