Commit 7f699bd1 authored by Stefan Popa's avatar Stefan Popa Committed by Jonathan Cameron
Browse files

iio: frequency: adf4371: Add support for ADF4371 PLL 

The ADF4371 is a frequency synthesizer with an integrated voltage
controlled oscillator (VCO) for phase-locked loops (PLLs). The ADF4371
has an integrated VCO with a fundamental output frequency ranging from
4000 MHz to 8000 MHz. In addition, the VCO frequency is connected to
divide by 1, 2, 4, 8, 16, 32, or 64 circuits that allows the user to
generate radio frequency (RF) output frequencies as low as 62.5 MHz at
RF8x. A frequency multiplier at RF16x generates from 8 GHz to 16 GHz. A
frequency quadrupler generates frequencies from 16 GHz to 32 GHz at RF32x.
RFAUX8x duplicates the frequency range of RF8x or permits direct access to
the VCO output.

The driver takes the reference input frequency from the device tree and
uses it to calculate and maximize the PFD frequency (frequency of the phase
frequency detector). The PFD frequency is further used to calculate the
timeouts: synthesizer lock, VCO band selection, automatic level
calibration (ALC) and PLL settling time.

This initial driver exposes the attributes for setting the frequency and
enabling/disabling the different adf4371 channels.

Datasheet:
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/adf4371.pdf



Signed-off-by: default avatarStefan Popa <stefan.popa@analog.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 81956a93

Documentation/ABI/testing/sysfs-bus-iio-frequency-adf4371

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What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency

KernelVersion:

Contact:	linux-iio@vger.kernel.org

Description:

		Stores the PLL frequency in Hz for channel Y.

		Reading returns the actual frequency in Hz.

		The ADF4371 has an integrated VCO with fundamendal output

		frequency ranging from 4000000000 Hz 8000000000 Hz.



		out_altvoltage0_frequency:

			A divide by 1, 2, 4, 8, 16, 32 or circuit generates

			frequencies from 62500000 Hz to 8000000000 Hz.

		out_altvoltage1_frequency:

			This channel duplicates the channel 0 frequency

		out_altvoltage2_frequency:

			A frequency doubler generates frequencies from

			8000000000 Hz to 16000000000 Hz.

		out_altvoltage3_frequency:

			A frequency quadrupler generates frequencies from

			16000000000 Hz to 32000000000 Hz.



		Note: writes to one of the channels will affect the frequency of

		all the other channels, since it involves changing the VCO

		fundamental output frequency.



What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_name

KernelVersion:

Contact:	linux-iio@vger.kernel.org

Description:

		Reading returns the datasheet name for channel Y:



		out_altvoltage0_name: RF8x

		out_altvoltage1_name: RFAUX8x

		out_altvoltage2_name: RF16x

		out_altvoltage3_name: RF32x



What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_powerdown

KernelVersion:

Contact:	linux-iio@vger.kernel.org

Description:

		This attribute allows the user to power down the PLL and it's

		RFOut buffers.

		Writing 1 causes the specified channel to power down.

		Clearing returns to normal operation.

drivers/iio/frequency/Kconfig

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@@ -38,5 +38,15 @@ config ADF4350 
	  To compile this driver as a module, choose M here: the

	  module will be called adf4350.



config ADF4371

	tristate "Analog Devices ADF4371 Wideband Synthesizer"

	depends on SPI

	select REGMAP_SPI

	help

	  Say yes here to build support for Analog Devices  ADF4371

	  Wideband Synthesizer. The driver provides direct access via sysfs.



	  To compile this driver as a module, choose M here: the

	  module will be called adf4371.

endmenu

endmenu

drivers/iio/frequency/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,3 +5,4 @@ 
# When adding new entries keep the list in alphabetical order

obj-$(CONFIG_AD9523) += ad9523.o

obj-$(CONFIG_ADF4350) += adf4350.o

obj-$(CONFIG_ADF4371) += adf4371.o

drivers/iio/frequency/adf4371.c

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// SPDX-License-Identifier: GPL-2.0

/*

 * Analog Devices ADF4371 SPI Wideband Synthesizer driver

 *

 * Copyright 2019 Analog Devices Inc.

 */

#include <linux/bitfield.h>

#include <linux/clk.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/gcd.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/sysfs.h>

#include <linux/spi/spi.h>



#include <linux/iio/iio.h>



/* Registers address macro */

#define ADF4371_REG(x)			(x)



/* ADF4371_REG0 */

#define ADF4371_ADDR_ASC_MSK		BIT(2)

#define ADF4371_ADDR_ASC(x)		FIELD_PREP(ADF4371_ADDR_ASC_MSK, x)

#define ADF4371_ADDR_ASC_R_MSK		BIT(5)

#define ADF4371_ADDR_ASC_R(x)		FIELD_PREP(ADF4371_ADDR_ASC_R_MSK, x)

#define ADF4371_RESET_CMD		0x81



/* ADF4371_REG17 */

#define ADF4371_FRAC2WORD_L_MSK		GENMASK(7, 1)

#define ADF4371_FRAC2WORD_L(x)		FIELD_PREP(ADF4371_FRAC2WORD_L_MSK, x)

#define ADF4371_FRAC1WORD_MSK		BIT(0)

#define ADF4371_FRAC1WORD(x)		FIELD_PREP(ADF4371_FRAC1WORD_MSK, x)



/* ADF4371_REG18 */

#define ADF4371_FRAC2WORD_H_MSK		GENMASK(6, 0)

#define ADF4371_FRAC2WORD_H(x)		FIELD_PREP(ADF4371_FRAC2WORD_H_MSK, x)



/* ADF4371_REG1A */

#define ADF4371_MOD2WORD_MSK		GENMASK(5, 0)

#define ADF4371_MOD2WORD(x)		FIELD_PREP(ADF4371_MOD2WORD_MSK, x)



/* ADF4371_REG24 */

#define ADF4371_RF_DIV_SEL_MSK		GENMASK(6, 4)

#define ADF4371_RF_DIV_SEL(x)		FIELD_PREP(ADF4371_RF_DIV_SEL_MSK, x)



/* ADF4371_REG32 */

#define ADF4371_TIMEOUT_MSK		GENMASK(1, 0)

#define ADF4371_TIMEOUT(x)		FIELD_PREP(ADF4371_TIMEOUT_MSK, x)



/* ADF4371_REG34 */

#define ADF4371_VCO_ALC_TOUT_MSK	GENMASK(4, 0)

#define ADF4371_VCO_ALC_TOUT(x)		FIELD_PREP(ADF4371_VCO_ALC_TOUT_MSK, x)



/* Specifications */

#define ADF4371_MIN_VCO_FREQ		4000000000ULL /* 4000 MHz */

#define ADF4371_MAX_VCO_FREQ		8000000000ULL /* 8000 MHz */

#define ADF4371_MAX_OUT_RF8_FREQ	ADF4371_MAX_VCO_FREQ /* Hz */

#define ADF4371_MIN_OUT_RF8_FREQ	(ADF4371_MIN_VCO_FREQ / 64) /* Hz */

#define ADF4371_MAX_OUT_RF16_FREQ	(ADF4371_MAX_VCO_FREQ * 2) /* Hz */

#define ADF4371_MIN_OUT_RF16_FREQ	(ADF4371_MIN_VCO_FREQ * 2) /* Hz */

#define ADF4371_MAX_OUT_RF32_FREQ	(ADF4371_MAX_VCO_FREQ * 4) /* Hz */

#define ADF4371_MIN_OUT_RF32_FREQ	(ADF4371_MIN_VCO_FREQ * 4) /* Hz */



#define ADF4371_MAX_FREQ_PFD		250000000UL /* Hz */

#define ADF4371_MAX_FREQ_REFIN		600000000UL /* Hz */



/* MOD1 is a 24-bit primary modulus with fixed value of 2^25 */

#define ADF4371_MODULUS1		33554432ULL

/* MOD2 is the programmable, 14-bit auxiliary fractional modulus */

#define ADF4371_MAX_MODULUS2		BIT(14)



#define ADF4371_CHECK_RANGE(freq, range) \

	((freq > ADF4371_MAX_ ## range) || (freq < ADF4371_MIN_ ## range))



enum {

	ADF4371_FREQ,

	ADF4371_POWER_DOWN,

	ADF4371_CHANNEL_NAME

};



enum {

	ADF4371_CH_RF8,

	ADF4371_CH_RFAUX8,

	ADF4371_CH_RF16,

	ADF4371_CH_RF32

};



struct adf4371_pwrdown {

	unsigned int reg;

	unsigned int bit;

};



static const char * const adf4371_ch_names[] = {

	"RF8x", "RFAUX8x", "RF16x", "RF32x"

};



static const struct adf4371_pwrdown adf4371_pwrdown_ch[4] = {

	[ADF4371_CH_RF8] = { ADF4371_REG(0x25), 2 },

	[ADF4371_CH_RFAUX8] = { ADF4371_REG(0x72), 3 },

	[ADF4371_CH_RF16] = { ADF4371_REG(0x25), 3 },

	[ADF4371_CH_RF32] = { ADF4371_REG(0x25), 4 },

};



static const struct reg_sequence adf4371_reg_defaults[] = {

	{ ADF4371_REG(0x0),  0x18 },

	{ ADF4371_REG(0x12), 0x40 },

	{ ADF4371_REG(0x1E), 0x48 },

	{ ADF4371_REG(0x20), 0x14 },

	{ ADF4371_REG(0x22), 0x00 },

	{ ADF4371_REG(0x23), 0x00 },

	{ ADF4371_REG(0x24), 0x80 },

	{ ADF4371_REG(0x25), 0x07 },

	{ ADF4371_REG(0x27), 0xC5 },

	{ ADF4371_REG(0x28), 0x83 },

	{ ADF4371_REG(0x2C), 0x44 },

	{ ADF4371_REG(0x2D), 0x11 },

	{ ADF4371_REG(0x2E), 0x12 },

	{ ADF4371_REG(0x2F), 0x94 },

	{ ADF4371_REG(0x32), 0x04 },

	{ ADF4371_REG(0x35), 0xFA },

	{ ADF4371_REG(0x36), 0x30 },

	{ ADF4371_REG(0x39), 0x07 },

	{ ADF4371_REG(0x3A), 0x55 },

	{ ADF4371_REG(0x3E), 0x0C },

	{ ADF4371_REG(0x3F), 0x80 },

	{ ADF4371_REG(0x40), 0x50 },

	{ ADF4371_REG(0x41), 0x28 },

	{ ADF4371_REG(0x47), 0xC0 },

	{ ADF4371_REG(0x52), 0xF4 },

	{ ADF4371_REG(0x70), 0x03 },

	{ ADF4371_REG(0x71), 0x60 },

	{ ADF4371_REG(0x72), 0x32 },

};



static const struct regmap_config adf4371_regmap_config = {

	.reg_bits = 16,

	.val_bits = 8,

	.read_flag_mask = BIT(7),

};



struct adf4371_state {

	struct spi_device *spi;

	struct regmap *regmap;

	struct clk *clkin;

	/*

	 * Lock for accessing device registers. Some operations require

	 * multiple consecutive R/W operations, during which the device

	 * shouldn't be interrupted. The buffers are also shared across

	 * all operations so need to be protected on stand alone reads and

	 * writes.

	 */

	struct mutex lock;

	unsigned long clkin_freq;

	unsigned long fpfd;

	unsigned int integer;

	unsigned int fract1;

	unsigned int fract2;

	unsigned int mod2;

	unsigned int rf_div_sel;

	unsigned int ref_div_factor;

	u8 buf[10] ____cacheline_aligned;

};



static unsigned long long adf4371_pll_fract_n_get_rate(struct adf4371_state *st,

						       u32 channel)

{

	unsigned long long val, tmp;

	unsigned int ref_div_sel;



	val = (((u64)st->integer * ADF4371_MODULUS1) + st->fract1) * st->fpfd;

	tmp = (u64)st->fract2 * st->fpfd;

	do_div(tmp, st->mod2);

	val += tmp + ADF4371_MODULUS1 / 2;



	if (channel == ADF4371_CH_RF8 || channel == ADF4371_CH_RFAUX8)

		ref_div_sel = st->rf_div_sel;

	else

		ref_div_sel = 0;



	do_div(val, ADF4371_MODULUS1 * (1 << ref_div_sel));



	if (channel == ADF4371_CH_RF16)

		val <<= 1;

	else if (channel == ADF4371_CH_RF32)

		val <<= 2;



	return val;

}



static void adf4371_pll_fract_n_compute(unsigned long long vco,

				       unsigned long long pfd,

				       unsigned int *integer,

				       unsigned int *fract1,

				       unsigned int *fract2,

				       unsigned int *mod2)

{

	unsigned long long tmp;

	u32 gcd_div;



	tmp = do_div(vco, pfd);

	tmp = tmp * ADF4371_MODULUS1;

	*fract2 = do_div(tmp, pfd);



	*integer = vco;

	*fract1 = tmp;



	*mod2 = pfd;



	while (*mod2 > ADF4371_MAX_MODULUS2) {

		*mod2 >>= 1;

		*fract2 >>= 1;

	}



	gcd_div = gcd(*fract2, *mod2);

	*mod2 /= gcd_div;

	*fract2 /= gcd_div;

}



static int adf4371_set_freq(struct adf4371_state *st, unsigned long long freq,

			    unsigned int channel)

{

	u32 cp_bleed;

	u8 int_mode = 0;

	int ret;



	switch (channel) {

	case ADF4371_CH_RF8:

	case ADF4371_CH_RFAUX8:

		if (ADF4371_CHECK_RANGE(freq, OUT_RF8_FREQ))

			return -EINVAL;



		st->rf_div_sel = 0;



		while (freq < ADF4371_MIN_VCO_FREQ) {

			freq <<= 1;

			st->rf_div_sel++;

		}

		break;

	case ADF4371_CH_RF16:

		/* ADF4371 RF16 8000...16000 MHz */

		if (ADF4371_CHECK_RANGE(freq, OUT_RF16_FREQ))

			return -EINVAL;



		freq >>= 1;

		break;

	case ADF4371_CH_RF32:

		/* ADF4371 RF32 16000...32000 MHz */

		if (ADF4371_CHECK_RANGE(freq, OUT_RF32_FREQ))

			return -EINVAL;



		freq >>= 2;

		break;

	default:

		return -EINVAL;

	}



	adf4371_pll_fract_n_compute(freq, st->fpfd, &st->integer, &st->fract1,

				    &st->fract2, &st->mod2);

	st->buf[0] = st->integer >> 8;

	st->buf[1] = 0x40; /* REG12 default */

	st->buf[2] = 0x00;

	st->buf[3] = st->fract2 & 0xFF;

	st->buf[4] = st->fract2 >> 7;

	st->buf[5] = st->fract2 >> 15;

	st->buf[6] = ADF4371_FRAC2WORD_L(st->fract2 & 0x7F) |

		     ADF4371_FRAC1WORD(st->fract1 >> 23);

	st->buf[7] = ADF4371_FRAC2WORD_H(st->fract2 >> 7);

	st->buf[8] = st->mod2 & 0xFF;

	st->buf[9] = ADF4371_MOD2WORD(st->mod2 >> 8);



	ret = regmap_bulk_write(st->regmap, ADF4371_REG(0x11), st->buf, 10);

	if (ret < 0)

		return ret;

	/*

	 * The R counter allows the input reference frequency to be

	 * divided down to produce the reference clock to the PFD

	 */

	ret = regmap_write(st->regmap, ADF4371_REG(0x1F), st->ref_div_factor);

	if (ret < 0)

		return ret;



	ret = regmap_update_bits(st->regmap, ADF4371_REG(0x24),

				 ADF4371_RF_DIV_SEL_MSK,

				 ADF4371_RF_DIV_SEL(st->rf_div_sel));

	if (ret < 0)

		return ret;



	cp_bleed = DIV_ROUND_UP(400 * 1750, st->integer * 375);

	cp_bleed = clamp(cp_bleed, 1U, 255U);

	ret = regmap_write(st->regmap, ADF4371_REG(0x26), cp_bleed);

	if (ret < 0)

		return ret;

	/*

	 * Set to 1 when in INT mode (when FRAC1 = FRAC2 = 0),

	 * and set to 0 when in FRAC mode.

	 */

	if (st->fract1 == 0 && st->fract2 == 0)

		int_mode = 0x01;



	ret = regmap_write(st->regmap, ADF4371_REG(0x2B), int_mode);

	if (ret < 0)

		return ret;



	return regmap_write(st->regmap, ADF4371_REG(0x10), st->integer & 0xFF);

}



static ssize_t adf4371_read(struct iio_dev *indio_dev,

			    uintptr_t private,

			    const struct iio_chan_spec *chan,

			    char *buf)

{

	struct adf4371_state *st = iio_priv(indio_dev);

	unsigned long long val = 0;

	unsigned int readval, reg, bit;

	int ret;



	switch ((u32)private) {

	case ADF4371_FREQ:

		val = adf4371_pll_fract_n_get_rate(st, chan->channel);

		ret = regmap_read(st->regmap, ADF4371_REG(0x7C), &readval);

		if (ret < 0)

			break;



		if (readval == 0x00) {

			dev_dbg(&st->spi->dev, "PLL un-locked\n");

			ret = -EBUSY;

		}

		break;

	case ADF4371_POWER_DOWN:

		reg = adf4371_pwrdown_ch[chan->channel].reg;

		bit = adf4371_pwrdown_ch[chan->channel].bit;



		ret = regmap_read(st->regmap, reg, &readval);

		if (ret < 0)

			break;



		val = !(readval & BIT(bit));

		break;

	case ADF4371_CHANNEL_NAME:

		return sprintf(buf, "%s\n", adf4371_ch_names[chan->channel]);

	default:

		ret = -EINVAL;

		val = 0;

		break;

	}



	return ret < 0 ? ret : sprintf(buf, "%llu\n", val);

}



static ssize_t adf4371_write(struct iio_dev *indio_dev,

			     uintptr_t private,

			     const struct iio_chan_spec *chan,

			     const char *buf, size_t len)

{

	struct adf4371_state *st = iio_priv(indio_dev);

	unsigned long long freq;

	bool power_down;

	unsigned int bit, readval, reg;

	int ret;



	mutex_lock(&st->lock);

	switch ((u32)private) {

	case ADF4371_FREQ:

		ret = kstrtoull(buf, 10, &freq);

		if (ret)

			break;



		ret = adf4371_set_freq(st, freq, chan->channel);

		break;

	case ADF4371_POWER_DOWN:

		ret = kstrtobool(buf, &power_down);

		if (ret)

			break;



		reg = adf4371_pwrdown_ch[chan->channel].reg;

		bit = adf4371_pwrdown_ch[chan->channel].bit;

		ret = regmap_read(st->regmap, reg, &readval);

		if (ret < 0)

			break;



		readval &= ~BIT(bit);

		readval |= (!power_down << bit);



		ret = regmap_write(st->regmap, reg, readval);

		break;

	default:

		ret = -EINVAL;

		break;

	}

	mutex_unlock(&st->lock);



	return ret ? ret : len;

}



#define _ADF4371_EXT_INFO(_name, _ident) { \

		.name = _name, \

		.read = adf4371_read, \

		.write = adf4371_write, \

		.private = _ident, \

		.shared = IIO_SEPARATE, \

}



static const struct iio_chan_spec_ext_info adf4371_ext_info[] = {

	/*

	 * Ideally we use IIO_CHAN_INFO_FREQUENCY, but there are

	 * values > 2^32 in order to support the entire frequency range

	 * in Hz. Using scale is a bit ugly.

	 */

	_ADF4371_EXT_INFO("frequency", ADF4371_FREQ),

	_ADF4371_EXT_INFO("powerdown", ADF4371_POWER_DOWN),

	_ADF4371_EXT_INFO("name", ADF4371_CHANNEL_NAME),

	{ },

};



#define ADF4371_CHANNEL(index) { \

		.type = IIO_ALTVOLTAGE, \

		.output = 1, \

		.channel = index, \

		.ext_info = adf4371_ext_info, \

		.indexed = 1, \

	}



static const struct iio_chan_spec adf4371_chan[] = {

	ADF4371_CHANNEL(ADF4371_CH_RF8),

	ADF4371_CHANNEL(ADF4371_CH_RFAUX8),

	ADF4371_CHANNEL(ADF4371_CH_RF16),

	ADF4371_CHANNEL(ADF4371_CH_RF32),

};



static int adf4371_reg_access(struct iio_dev *indio_dev,

			      unsigned int reg,

			      unsigned int writeval,

			      unsigned int *readval)

{

	struct adf4371_state *st = iio_priv(indio_dev);



	if (readval)

		return regmap_read(st->regmap, reg, readval);

	else

		return regmap_write(st->regmap, reg, writeval);

}



static const struct iio_info adf4371_info = {

	.debugfs_reg_access = &adf4371_reg_access,

};



static int adf4371_setup(struct adf4371_state *st)

{

	unsigned int synth_timeout = 2, timeout = 1, vco_alc_timeout = 1;

	unsigned int vco_band_div, tmp;

	int ret;



	/* Perform a software reset */

	ret = regmap_write(st->regmap, ADF4371_REG(0x0), ADF4371_RESET_CMD);

	if (ret < 0)

		return ret;



	ret = regmap_multi_reg_write(st->regmap, adf4371_reg_defaults,

				     ARRAY_SIZE(adf4371_reg_defaults));

	if (ret < 0)

		return ret;



	/* Set address in ascending order, so the bulk_write() will work */

	ret = regmap_update_bits(st->regmap, ADF4371_REG(0x0),

				 ADF4371_ADDR_ASC_MSK | ADF4371_ADDR_ASC_R_MSK,

				 ADF4371_ADDR_ASC(1) | ADF4371_ADDR_ASC_R(1));

	if (ret < 0)

		return ret;

	/*

	 * Calculate and maximize PFD frequency

	 * fPFD = REFIN × ((1 + D)/(R × (1 + T)))

	 * Where D is the REFIN doubler bit, T is the reference divide by 2,

	 * R is the reference division factor

	 * TODO: it is assumed D and T equal 0.

	 */

	do {

		st->ref_div_factor++;

		st->fpfd = st->clkin_freq / st->ref_div_factor;

	} while (st->fpfd > ADF4371_MAX_FREQ_PFD);



	/* Calculate Timeouts */

	vco_band_div = DIV_ROUND_UP(st->fpfd, 2400000U);



	tmp = DIV_ROUND_CLOSEST(st->fpfd, 1000000U);

	do {

		timeout++;

		if (timeout > 1023) {

			timeout = 2;

			synth_timeout++;

		}

	} while (synth_timeout * 1024 + timeout <= 20 * tmp);



	do {

		vco_alc_timeout++;

	} while (vco_alc_timeout * 1024 - timeout <= 50 * tmp);



	st->buf[0] = vco_band_div;

	st->buf[1] = timeout & 0xFF;

	st->buf[2] = ADF4371_TIMEOUT(timeout >> 8) | 0x04;

	st->buf[3] = synth_timeout;

	st->buf[4] = ADF4371_VCO_ALC_TOUT(vco_alc_timeout);



	return regmap_bulk_write(st->regmap, ADF4371_REG(0x30), st->buf, 5);

}



static void adf4371_clk_disable(void *data)

{

	struct adf4371_state *st = data;



	clk_disable_unprepare(st->clkin);

}



static int adf4371_probe(struct spi_device *spi)

{

	const struct spi_device_id *id = spi_get_device_id(spi);

	struct iio_dev *indio_dev;

	struct adf4371_state *st;

	struct regmap *regmap;

	int ret;



	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));

	if (!indio_dev)

		return -ENOMEM;



	regmap = devm_regmap_init_spi(spi, &adf4371_regmap_config);

	if (IS_ERR(regmap)) {

		dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",

			PTR_ERR(regmap));

		return PTR_ERR(regmap);

	}



	st = iio_priv(indio_dev);

	spi_set_drvdata(spi, indio_dev);

	st->spi = spi;

	st->regmap = regmap;

	mutex_init(&st->lock);



	indio_dev->dev.parent = &spi->dev;

	indio_dev->name = id->name;

	indio_dev->info = &adf4371_info;

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = adf4371_chan;

	indio_dev->num_channels = ARRAY_SIZE(adf4371_chan);



	st->clkin = devm_clk_get(&spi->dev, "clkin");

	if (IS_ERR(st->clkin))

		return PTR_ERR(st->clkin);



	ret = clk_prepare_enable(st->clkin);

	if (ret < 0)

		return ret;



	ret = devm_add_action_or_reset(&spi->dev, adf4371_clk_disable, st);

	if (ret)

		return ret;



	st->clkin_freq = clk_get_rate(st->clkin);



	ret = adf4371_setup(st);

	if (ret < 0) {

		dev_err(&spi->dev, "ADF4371 setup failed\n");

		return ret;

	}



	return devm_iio_device_register(&spi->dev, indio_dev);

}



static const struct spi_device_id adf4371_id_table[] = {

	{ "adf4371", 0 },

	{}

};

MODULE_DEVICE_TABLE(spi, adf4371_id_table);



static const struct of_device_id adf4371_of_match[] = {

	{ .compatible = "adi,adf4371" },

	{ },

};

MODULE_DEVICE_TABLE(of, adf4371_of_match);



static struct spi_driver adf4371_driver = {

	.driver = {

		.name = "adf4371",

		.of_match_table = adf4371_of_match,

	},

	.probe = adf4371_probe,

	.id_table = adf4371_id_table,

};

module_spi_driver(adf4371_driver);



MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");

MODULE_DESCRIPTION("Analog Devices ADF4371 SPI PLL");

MODULE_LICENSE("GPL");

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