drivers/iio/frequency/adf4350.c - kernel/msm-4.19 - Gitiles

 /*
  * ADF4350/ADF4351 SPI Wideband Synthesizer driver
  *
  * Copyright 2012-2013 Analog Devices Inc.
  *
  * Licensed under the GPL-2.
  */

 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/spi/spi.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/gcd.h>
 #include <linux/gpio.h>
 #include <asm/div64.h>
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>

 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/frequency/adf4350.h>

 enum {
 	ADF4350_FREQ,
 	ADF4350_FREQ_REFIN,
 	ADF4350_FREQ_RESOLUTION,
 	ADF4350_PWRDOWN,
 };

 struct adf4350_state {
 	struct spi_device		*spi;
 	struct regulator		*reg;
 	struct adf4350_platform_data	*pdata;
 	struct clk			*clk;
 	unsigned long			clkin;
 	unsigned long			chspc; /* Channel Spacing */
 	unsigned long			fpfd; /* Phase Frequency Detector */
 	unsigned long			min_out_freq;
 	unsigned			r0_fract;
 	unsigned			r0_int;
 	unsigned			r1_mod;
 	unsigned			r4_rf_div_sel;
 	unsigned long			regs[6];
 	unsigned long			regs_hw[6];
 	unsigned long long		freq_req;
 	/*
 	 * DMA (thus cache coherency maintenance) requires the
 	 * transfer buffers to live in their own cache lines.
 	 */
 	__be32				val ____cacheline_aligned;
 };

 static struct adf4350_platform_data default_pdata = {
 	.channel_spacing = 10000,
 	.r2_user_settings = ADF4350_REG2_PD_POLARITY_POS |
 			    ADF4350_REG2_CHARGE_PUMP_CURR_uA(2500),
 	.r3_user_settings = ADF4350_REG3_12BIT_CLKDIV_MODE(0),
 	.r4_user_settings = ADF4350_REG4_OUTPUT_PWR(3) |
 			    ADF4350_REG4_MUTE_TILL_LOCK_EN,
 	.gpio_lock_detect = -1,
 };

 static int adf4350_sync_config(struct adf4350_state *st)
 {
 	int ret, i, doublebuf = 0;

 	for (i = ADF4350_REG5; i >= ADF4350_REG0; i--) {
 		if ((st->regs_hw[i] != st->regs[i]) ||
 			((i == ADF4350_REG0) && doublebuf)) {

 			switch (i) {
 			case ADF4350_REG1:
 			case ADF4350_REG4:
 				doublebuf = 1;
 				break;
 			}

 			st->val  = cpu_to_be32(st->regs[i] | i);
 			ret = spi_write(st->spi, &st->val, 4);
 			if (ret < 0)
 				return ret;
 			st->regs_hw[i] = st->regs[i];
 			dev_dbg(&st->spi->dev, "[%d] 0x%X\n",
 				i, (u32)st->regs[i] | i);
 		}
 	}
 	return 0;
 }

 static int adf4350_reg_access(struct iio_dev *indio_dev,
 			      unsigned reg, unsigned writeval,
 			      unsigned *readval)
 {
 	struct adf4350_state *st = iio_priv(indio_dev);
 	int ret;

 	if (reg > ADF4350_REG5)
 		return -EINVAL;

 	mutex_lock(&indio_dev->mlock);
 	if (readval == NULL) {
 		st->regs[reg] = writeval & ~(BIT(0) | BIT(1) | BIT(2));
 		ret = adf4350_sync_config(st);
 	} else {
 		*readval =  st->regs_hw[reg];
 		ret = 0;
 	}
 	mutex_unlock(&indio_dev->mlock);

 	return ret;
 }

 static int adf4350_tune_r_cnt(struct adf4350_state *st, unsigned short r_cnt)
 {
 	struct adf4350_platform_data *pdata = st->pdata;

 	do {
 		r_cnt++;
 		st->fpfd = (st->clkin * (pdata->ref_doubler_en ? 2 : 1)) /
 			   (r_cnt * (pdata->ref_div2_en ? 2 : 1));
 	} while (st->fpfd > ADF4350_MAX_FREQ_PFD);

 	return r_cnt;
 }

 static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq)
 {
 	struct adf4350_platform_data *pdata = st->pdata;
 	u64 tmp;
 	u32 div_gcd, prescaler, chspc;
 	u16 mdiv, r_cnt = 0;
 	u8 band_sel_div;

 	if (freq > ADF4350_MAX_OUT_FREQ || freq < st->min_out_freq)
 		return -EINVAL;

 	if (freq > ADF4350_MAX_FREQ_45_PRESC) {
 		prescaler = ADF4350_REG1_PRESCALER;
 		mdiv = 75;
 	} else {
 		prescaler = 0;
 		mdiv = 23;
 	}

 	st->r4_rf_div_sel = 0;

 	while (freq < ADF4350_MIN_VCO_FREQ) {
 		freq <<= 1;
 		st->r4_rf_div_sel++;
 	}

 	/*
 	 * Allow a predefined reference division factor
 	 * if not set, compute our own
 	 */
 	if (pdata->ref_div_factor)
 		r_cnt = pdata->ref_div_factor - 1;

 	chspc = st->chspc;

 	do  {
 		do {
 			do {
 				r_cnt = adf4350_tune_r_cnt(st, r_cnt);
 				st->r1_mod = st->fpfd / chspc;
 				if (r_cnt > ADF4350_MAX_R_CNT) {
 					/* try higher spacing values */
 					chspc++;
 					r_cnt = 0;
 				}
 			} while ((st->r1_mod > ADF4350_MAX_MODULUS) && r_cnt);
 		} while (r_cnt == 0);

 		tmp = freq * (u64)st->r1_mod + (st->fpfd >> 1);
 		do_div(tmp, st->fpfd); /* Div round closest (n + d/2)/d */
 		st->r0_fract = do_div(tmp, st->r1_mod);
 		st->r0_int = tmp;
 	} while (mdiv > st->r0_int);

 	band_sel_div = DIV_ROUND_UP(st->fpfd, ADF4350_MAX_BANDSEL_CLK);

 	if (st->r0_fract && st->r1_mod) {
 		div_gcd = gcd(st->r1_mod, st->r0_fract);
 		st->r1_mod /= div_gcd;
 		st->r0_fract /= div_gcd;
 	} else {
 		st->r0_fract = 0;
 		st->r1_mod = 1;
 	}

 	dev_dbg(&st->spi->dev, "VCO: %llu Hz, PFD %lu Hz\n"
 		"REF_DIV %d, R0_INT %d, R0_FRACT %d\n"
 		"R1_MOD %d, RF_DIV %d\nPRESCALER %s, BAND_SEL_DIV %d\n",
 		freq, st->fpfd, r_cnt, st->r0_int, st->r0_fract, st->r1_mod,
 		1 << st->r4_rf_div_sel, prescaler ? "8/9" : "4/5",
 		band_sel_div);

 	st->regs[ADF4350_REG0] = ADF4350_REG0_INT(st->r0_int) |
 				 ADF4350_REG0_FRACT(st->r0_fract);

 	st->regs[ADF4350_REG1] = ADF4350_REG1_PHASE(1) |
 				 ADF4350_REG1_MOD(st->r1_mod) |
 				 prescaler;

 	st->regs[ADF4350_REG2] =
 		ADF4350_REG2_10BIT_R_CNT(r_cnt) |
 		ADF4350_REG2_DOUBLE_BUFF_EN |
 		(pdata->ref_doubler_en ? ADF4350_REG2_RMULT2_EN : 0) |
 		(pdata->ref_div2_en ? ADF4350_REG2_RDIV2_EN : 0) |
 		(pdata->r2_user_settings & (ADF4350_REG2_PD_POLARITY_POS |
 		ADF4350_REG2_LDP_6ns | ADF4350_REG2_LDF_INT_N |
 		ADF4350_REG2_CHARGE_PUMP_CURR_uA(5000) |
 		ADF4350_REG2_MUXOUT(0x7) | ADF4350_REG2_NOISE_MODE(0x3)));

 	st->regs[ADF4350_REG3] = pdata->r3_user_settings &
 				 (ADF4350_REG3_12BIT_CLKDIV(0xFFF) |
 				 ADF4350_REG3_12BIT_CLKDIV_MODE(0x3) |
 				 ADF4350_REG3_12BIT_CSR_EN |
 				 ADF4351_REG3_CHARGE_CANCELLATION_EN |
 				 ADF4351_REG3_ANTI_BACKLASH_3ns_EN |
 				 ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH);

 	st->regs[ADF4350_REG4] =
 		ADF4350_REG4_FEEDBACK_FUND |
 		ADF4350_REG4_RF_DIV_SEL(st->r4_rf_div_sel) |
 		ADF4350_REG4_8BIT_BAND_SEL_CLKDIV(band_sel_div) |
 		ADF4350_REG4_RF_OUT_EN |
 		(pdata->r4_user_settings &
 		(ADF4350_REG4_OUTPUT_PWR(0x3) |
 		ADF4350_REG4_AUX_OUTPUT_PWR(0x3) |
 		ADF4350_REG4_AUX_OUTPUT_EN |
 		ADF4350_REG4_AUX_OUTPUT_FUND |
 		ADF4350_REG4_MUTE_TILL_LOCK_EN));

 	st->regs[ADF4350_REG5] = ADF4350_REG5_LD_PIN_MODE_DIGITAL;
 	st->freq_req = freq;

 	return adf4350_sync_config(st);
 }

 static ssize_t adf4350_write(struct iio_dev *indio_dev,
 				    uintptr_t private,
 				    const struct iio_chan_spec *chan,
 				    const char *buf, size_t len)
 {
 	struct adf4350_state *st = iio_priv(indio_dev);
 	unsigned long long readin;
 	unsigned long tmp;
 	int ret;

 	ret = kstrtoull(buf, 10, &readin);
 	if (ret)
 		return ret;

 	mutex_lock(&indio_dev->mlock);
 	switch ((u32)private) {
 	case ADF4350_FREQ:
 		ret = adf4350_set_freq(st, readin);
 		break;
 	case ADF4350_FREQ_REFIN:
 		if (readin > ADF4350_MAX_FREQ_REFIN) {
 			ret = -EINVAL;
 			break;
 		}

 		if (st->clk) {
 			tmp = clk_round_rate(st->clk, readin);
 			if (tmp != readin) {
 				ret = -EINVAL;
 				break;
 			}
 			ret = clk_set_rate(st->clk, tmp);
 			if (ret < 0)
 				break;
 		}
 		st->clkin = readin;
 		ret = adf4350_set_freq(st, st->freq_req);
 		break;
 	case ADF4350_FREQ_RESOLUTION:
 		if (readin == 0)
 			ret = -EINVAL;
 		else
 			st->chspc = readin;
 		break;
 	case ADF4350_PWRDOWN:
 		if (readin)
 			st->regs[ADF4350_REG2] |= ADF4350_REG2_POWER_DOWN_EN;
 		else
 			st->regs[ADF4350_REG2] &= ~ADF4350_REG2_POWER_DOWN_EN;

 		adf4350_sync_config(st);
 		break;
 	default:
 		ret = -EINVAL;
 	}
 	mutex_unlock(&indio_dev->mlock);

 	return ret ? ret : len;
 }

 static ssize_t adf4350_read(struct iio_dev *indio_dev,
 				   uintptr_t private,
 				   const struct iio_chan_spec *chan,
 				   char *buf)
 {
 	struct adf4350_state *st = iio_priv(indio_dev);
 	unsigned long long val;
 	int ret = 0;

 	mutex_lock(&indio_dev->mlock);
 	switch ((u32)private) {
 	case ADF4350_FREQ:
 		val = (u64)((st->r0_int * st->r1_mod) + st->r0_fract) *
 			(u64)st->fpfd;
 		do_div(val, st->r1_mod * (1 << st->r4_rf_div_sel));
 		/* PLL unlocked? return error */
 		if (gpio_is_valid(st->pdata->gpio_lock_detect))
 			if (!gpio_get_value(st->pdata->gpio_lock_detect)) {
 				dev_dbg(&st->spi->dev, "PLL un-locked\n");
 				ret = -EBUSY;
 			}
 		break;
 	case ADF4350_FREQ_REFIN:
 		if (st->clk)
 			st->clkin = clk_get_rate(st->clk);

 		val = st->clkin;
 		break;
 	case ADF4350_FREQ_RESOLUTION:
 		val = st->chspc;
 		break;
 	case ADF4350_PWRDOWN:
 		val = !!(st->regs[ADF4350_REG2] & ADF4350_REG2_POWER_DOWN_EN);
 		break;
 	default:
 		ret = -EINVAL;
 		val = 0;
 	}
 	mutex_unlock(&indio_dev->mlock);

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

 #define _ADF4350_EXT_INFO(_name, _ident) { \
 	.name = _name, \
 	.read = adf4350_read, \
 	.write = adf4350_write, \
 	.private = _ident, \
 }

 static const struct iio_chan_spec_ext_info adf4350_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.
 	 */
 	_ADF4350_EXT_INFO("frequency", ADF4350_FREQ),
 	_ADF4350_EXT_INFO("frequency_resolution", ADF4350_FREQ_RESOLUTION),
 	_ADF4350_EXT_INFO("refin_frequency", ADF4350_FREQ_REFIN),
 	_ADF4350_EXT_INFO("powerdown", ADF4350_PWRDOWN),
 	{ },
 };

 static const struct iio_chan_spec adf4350_chan = {
 	.type = IIO_ALTVOLTAGE,
 	.indexed = 1,
 	.output = 1,
 	.ext_info = adf4350_ext_info,
 };

 static const struct iio_info adf4350_info = {
 	.debugfs_reg_access = &adf4350_reg_access,
 	.driver_module = THIS_MODULE,
 };

 #ifdef CONFIG_OF
 static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
 	struct adf4350_platform_data *pdata;
 	unsigned int tmp;
 	int ret;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata) {
 		dev_err(dev, "could not allocate memory for platform data\n");
 		return NULL;
 	}

 	strncpy(&pdata->name[0], np->name, SPI_NAME_SIZE - 1);

 	tmp = 10000;
 	of_property_read_u32(np, "adi,channel-spacing", &tmp);
 	pdata->channel_spacing = tmp;

 	tmp = 0;
 	of_property_read_u32(np, "adi,power-up-frequency", &tmp);
 	pdata->power_up_frequency = tmp;

 	tmp = 0;
 	of_property_read_u32(np, "adi,reference-div-factor", &tmp);
 	pdata->ref_div_factor = tmp;

 	ret = of_get_gpio(np, 0);
 	if (ret < 0)
 		pdata->gpio_lock_detect = -1;
 	else
 		pdata->gpio_lock_detect = ret;

 	pdata->ref_doubler_en = of_property_read_bool(np,
 			"adi,reference-doubler-enable");
 	pdata->ref_div2_en = of_property_read_bool(np,
 			"adi,reference-div2-enable");

 	/* r2_user_settings */
 	pdata->r2_user_settings = of_property_read_bool(np,
 			"adi,phase-detector-polarity-positive-enable") ?
 			ADF4350_REG2_PD_POLARITY_POS : 0;
 	pdata->r2_user_settings |= of_property_read_bool(np,
 			"adi,lock-detect-precision-6ns-enable") ?
 			ADF4350_REG2_LDP_6ns : 0;
 	pdata->r2_user_settings |= of_property_read_bool(np,
 			"adi,lock-detect-function-integer-n-enable") ?
 			ADF4350_REG2_LDF_INT_N : 0;

 	tmp = 2500;
 	of_property_read_u32(np, "adi,charge-pump-current", &tmp);
 	pdata->r2_user_settings |= ADF4350_REG2_CHARGE_PUMP_CURR_uA(tmp);

 	tmp = 0;
 	of_property_read_u32(np, "adi,muxout-select", &tmp);
 	pdata->r2_user_settings |= ADF4350_REG2_MUXOUT(tmp);

 	pdata->r2_user_settings |= of_property_read_bool(np,
 			"adi,low-spur-mode-enable") ?
 			ADF4350_REG2_NOISE_MODE(0x3) : 0;

 	/* r3_user_settings */

 	pdata->r3_user_settings = of_property_read_bool(np,
 			"adi,cycle-slip-reduction-enable") ?
 			ADF4350_REG3_12BIT_CSR_EN : 0;
 	pdata->r3_user_settings |= of_property_read_bool(np,
 			"adi,charge-cancellation-enable") ?
 			ADF4351_REG3_CHARGE_CANCELLATION_EN : 0;

 	pdata->r3_user_settings |= of_property_read_bool(np,
 			"adi,anti-backlash-3ns-enable") ?
 			ADF4351_REG3_ANTI_BACKLASH_3ns_EN : 0;
 	pdata->r3_user_settings |= of_property_read_bool(np,
 			"adi,band-select-clock-mode-high-enable") ?
 			ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH : 0;

 	tmp = 0;
 	of_property_read_u32(np, "adi,12bit-clk-divider", &tmp);
 	pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV(tmp);

 	tmp = 0;
 	of_property_read_u32(np, "adi,clk-divider-mode", &tmp);
 	pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV_MODE(tmp);

 	/* r4_user_settings */

 	pdata->r4_user_settings = of_property_read_bool(np,
 			"adi,aux-output-enable") ?
 			ADF4350_REG4_AUX_OUTPUT_EN : 0;
 	pdata->r4_user_settings |= of_property_read_bool(np,
 			"adi,aux-output-fundamental-enable") ?
 			ADF4350_REG4_AUX_OUTPUT_FUND : 0;
 	pdata->r4_user_settings |= of_property_read_bool(np,
 			"adi,mute-till-lock-enable") ?
 			ADF4350_REG4_MUTE_TILL_LOCK_EN : 0;

 	tmp = 0;
 	of_property_read_u32(np, "adi,output-power", &tmp);
 	pdata->r4_user_settings |= ADF4350_REG4_OUTPUT_PWR(tmp);

 	tmp = 0;
 	of_property_read_u32(np, "adi,aux-output-power", &tmp);
 	pdata->r4_user_settings |= ADF4350_REG4_AUX_OUTPUT_PWR(tmp);

 	return pdata;
 }
 #else
 static
 struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
 {
 	return NULL;
 }
 #endif

 static int adf4350_probe(struct spi_device *spi)
 {
 	struct adf4350_platform_data *pdata;
 	struct iio_dev *indio_dev;
 	struct adf4350_state *st;
 	struct clk *clk = NULL;
 	int ret;

 	if (spi->dev.of_node) {
 		pdata = adf4350_parse_dt(&spi->dev);
 		if (pdata == NULL)
 			return -EINVAL;
 	} else {
 		pdata = spi->dev.platform_data;
 	}

 	if (!pdata) {
 		dev_warn(&spi->dev, "no platform data? using default\n");
 		pdata = &default_pdata;
 	}

 	if (!pdata->clkin) {
 		clk = devm_clk_get(&spi->dev, "clkin");
 		if (IS_ERR(clk))
 			return -EPROBE_DEFER;

 		ret = clk_prepare_enable(clk);
 		if (ret < 0)
 			return ret;
 	}

 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (indio_dev == NULL) {
 		ret =  -ENOMEM;
 		goto error_disable_clk;
 	}

 	st = iio_priv(indio_dev);

 	st->reg = devm_regulator_get(&spi->dev, "vcc");
 	if (!IS_ERR(st->reg)) {
 		ret = regulator_enable(st->reg);
 		if (ret)
 			goto error_disable_clk;
 	}

 	spi_set_drvdata(spi, indio_dev);
 	st->spi = spi;
 	st->pdata = pdata;

 	indio_dev->dev.parent = &spi->dev;
 	indio_dev->name = (pdata->name[0] != 0) ? pdata->name :
 		spi_get_device_id(spi)->name;

 	indio_dev->info = &adf4350_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = &adf4350_chan;
 	indio_dev->num_channels = 1;

 	st->chspc = pdata->channel_spacing;
 	if (clk) {
 		st->clk = clk;
 		st->clkin = clk_get_rate(clk);
 	} else {
 		st->clkin = pdata->clkin;
 	}

 	st->min_out_freq = spi_get_device_id(spi)->driver_data == 4351 ?
 		ADF4351_MIN_OUT_FREQ : ADF4350_MIN_OUT_FREQ;

 	memset(st->regs_hw, 0xFF, sizeof(st->regs_hw));

 	if (gpio_is_valid(pdata->gpio_lock_detect)) {
 		ret = devm_gpio_request(&spi->dev, pdata->gpio_lock_detect,
 					indio_dev->name);
 		if (ret) {
 			dev_err(&spi->dev, "fail to request lock detect GPIO-%d",
 				pdata->gpio_lock_detect);
 			goto error_disable_reg;
 		}
 		gpio_direction_input(pdata->gpio_lock_detect);
 	}

 	if (pdata->power_up_frequency) {
 		ret = adf4350_set_freq(st, pdata->power_up_frequency);
 		if (ret)
 			goto error_disable_reg;
 	}

 	ret = iio_device_register(indio_dev);
 	if (ret)
 		goto error_disable_reg;

 	return 0;

 error_disable_reg:
 	if (!IS_ERR(st->reg))
 		regulator_disable(st->reg);
 error_disable_clk:
 	if (clk)
 		clk_disable_unprepare(clk);

 	return ret;
 }

 static int adf4350_remove(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev = spi_get_drvdata(spi);
 	struct adf4350_state *st = iio_priv(indio_dev);
 	struct regulator *reg = st->reg;

 	st->regs[ADF4350_REG2] |= ADF4350_REG2_POWER_DOWN_EN;
 	adf4350_sync_config(st);

 	iio_device_unregister(indio_dev);

 	if (st->clk)
 		clk_disable_unprepare(st->clk);

 	if (!IS_ERR(reg)) {
 		regulator_disable(reg);
 	}

 	return 0;
 }

 static const struct spi_device_id adf4350_id[] = {
 	{"adf4350", 4350},
 	{"adf4351", 4351},
 	{}
 };

 static struct spi_driver adf4350_driver = {
 	.driver = {
 		.name	= "adf4350",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= adf4350_probe,
 	.remove		= adf4350_remove,
 	.id_table	= adf4350_id,
 };
 module_spi_driver(adf4350_driver);

 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_DESCRIPTION("Analog Devices ADF4350/ADF4351 PLL");
 MODULE_LICENSE("GPL v2");
	/*
	* ADF4350/ADF4351 SPI Wideband Synthesizer driver
	*
	* Copyright 2012-2013 Analog Devices Inc.
	*
	* Licensed under the GPL-2.
	*/

	#include <linux/device.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/sysfs.h>
	#include <linux/spi/spi.h>
	#include <linux/regulator/consumer.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include <linux/gcd.h>
	#include <linux/gpio.h>
	#include <asm/div64.h>
	#include <linux/clk.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>

	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>
	#include <linux/iio/frequency/adf4350.h>

	enum {
	ADF4350_FREQ,
	ADF4350_FREQ_REFIN,
	ADF4350_FREQ_RESOLUTION,
	ADF4350_PWRDOWN,
	};

	struct adf4350_state {
	struct spi_device *spi;
	struct regulator *reg;
	struct adf4350_platform_data *pdata;
	struct clk *clk;
	unsigned long clkin;
	unsigned long chspc; /* Channel Spacing */
	unsigned long fpfd; /* Phase Frequency Detector */
	unsigned long min_out_freq;
	unsigned r0_fract;
	unsigned r0_int;
	unsigned r1_mod;
	unsigned r4_rf_div_sel;
	unsigned long regs[6];
	unsigned long regs_hw[6];
	unsigned long long freq_req;
	/*
	* DMA (thus cache coherency maintenance) requires the
	* transfer buffers to live in their own cache lines.
	*/
	__be32 val ____cacheline_aligned;
	};

	static struct adf4350_platform_data default_pdata = {
	.channel_spacing = 10000,
	.r2_user_settings = ADF4350_REG2_PD_POLARITY_POS \|
	ADF4350_REG2_CHARGE_PUMP_CURR_uA(2500),
	.r3_user_settings = ADF4350_REG3_12BIT_CLKDIV_MODE(0),
	.r4_user_settings = ADF4350_REG4_OUTPUT_PWR(3) \|
	ADF4350_REG4_MUTE_TILL_LOCK_EN,
	.gpio_lock_detect = -1,
	};

	static int adf4350_sync_config(struct adf4350_state *st)
	{
	int ret, i, doublebuf = 0;

	for (i = ADF4350_REG5; i >= ADF4350_REG0; i--) {
	if ((st->regs_hw[i] != st->regs[i]) \|\|
	((i == ADF4350_REG0) && doublebuf)) {

	switch (i) {
	case ADF4350_REG1:
	case ADF4350_REG4:
	doublebuf = 1;
	break;
	}

	st->val = cpu_to_be32(st->regs[i] \| i);
	ret = spi_write(st->spi, &st->val, 4);
	if (ret < 0)
	return ret;
	st->regs_hw[i] = st->regs[i];
	dev_dbg(&st->spi->dev, "[%d] 0x%X\n",
	i, (u32)st->regs[i] \| i);
	}
	}
	return 0;
	}

	static int adf4350_reg_access(struct iio_dev *indio_dev,
	unsigned reg, unsigned writeval,
	unsigned *readval)
	{
	struct adf4350_state *st = iio_priv(indio_dev);
	int ret;

	if (reg > ADF4350_REG5)
	return -EINVAL;

	mutex_lock(&indio_dev->mlock);
	if (readval == NULL) {
	st->regs[reg] = writeval & ~(BIT(0) \| BIT(1) \| BIT(2));
	ret = adf4350_sync_config(st);
	} else {
	*readval = st->regs_hw[reg];
	ret = 0;
	}
	mutex_unlock(&indio_dev->mlock);

	return ret;
	}

	static int adf4350_tune_r_cnt(struct adf4350_state *st, unsigned short r_cnt)
	{
	struct adf4350_platform_data *pdata = st->pdata;

	do {
	r_cnt++;
	st->fpfd = (st->clkin * (pdata->ref_doubler_en ? 2 : 1)) /
	(r_cnt * (pdata->ref_div2_en ? 2 : 1));
	} while (st->fpfd > ADF4350_MAX_FREQ_PFD);

	return r_cnt;
	}

	static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq)
	{
	struct adf4350_platform_data *pdata = st->pdata;
	u64 tmp;
	u32 div_gcd, prescaler, chspc;
	u16 mdiv, r_cnt = 0;
	u8 band_sel_div;

	if (freq > ADF4350_MAX_OUT_FREQ \|\| freq < st->min_out_freq)
	return -EINVAL;

	if (freq > ADF4350_MAX_FREQ_45_PRESC) {
	prescaler = ADF4350_REG1_PRESCALER;
	mdiv = 75;
	} else {
	prescaler = 0;
	mdiv = 23;
	}

	st->r4_rf_div_sel = 0;

	while (freq < ADF4350_MIN_VCO_FREQ) {
	freq <<= 1;
	st->r4_rf_div_sel++;
	}

	/*
	* Allow a predefined reference division factor
	* if not set, compute our own
	*/
	if (pdata->ref_div_factor)
	r_cnt = pdata->ref_div_factor - 1;

	chspc = st->chspc;

	do {
	do {
	do {
	r_cnt = adf4350_tune_r_cnt(st, r_cnt);
	st->r1_mod = st->fpfd / chspc;
	if (r_cnt > ADF4350_MAX_R_CNT) {
	/* try higher spacing values */
	chspc++;
	r_cnt = 0;
	}
	} while ((st->r1_mod > ADF4350_MAX_MODULUS) && r_cnt);
	} while (r_cnt == 0);

	tmp = freq * (u64)st->r1_mod + (st->fpfd >> 1);
	do_div(tmp, st->fpfd); /* Div round closest (n + d/2)/d */
	st->r0_fract = do_div(tmp, st->r1_mod);
	st->r0_int = tmp;
	} while (mdiv > st->r0_int);

	band_sel_div = DIV_ROUND_UP(st->fpfd, ADF4350_MAX_BANDSEL_CLK);

	if (st->r0_fract && st->r1_mod) {
	div_gcd = gcd(st->r1_mod, st->r0_fract);
	st->r1_mod /= div_gcd;
	st->r0_fract /= div_gcd;
	} else {
	st->r0_fract = 0;
	st->r1_mod = 1;
	}

	dev_dbg(&st->spi->dev, "VCO: %llu Hz, PFD %lu Hz\n"
	"REF_DIV %d, R0_INT %d, R0_FRACT %d\n"
	"R1_MOD %d, RF_DIV %d\nPRESCALER %s, BAND_SEL_DIV %d\n",
	freq, st->fpfd, r_cnt, st->r0_int, st->r0_fract, st->r1_mod,
	1 << st->r4_rf_div_sel, prescaler ? "8/9" : "4/5",
	band_sel_div);

	st->regs[ADF4350_REG0] = ADF4350_REG0_INT(st->r0_int) \|
	ADF4350_REG0_FRACT(st->r0_fract);

	st->regs[ADF4350_REG1] = ADF4350_REG1_PHASE(1) \|
	ADF4350_REG1_MOD(st->r1_mod) \|
	prescaler;

	st->regs[ADF4350_REG2] =
	ADF4350_REG2_10BIT_R_CNT(r_cnt) \|
	ADF4350_REG2_DOUBLE_BUFF_EN \|
	(pdata->ref_doubler_en ? ADF4350_REG2_RMULT2_EN : 0) \|
	(pdata->ref_div2_en ? ADF4350_REG2_RDIV2_EN : 0) \|
	(pdata->r2_user_settings & (ADF4350_REG2_PD_POLARITY_POS \|
	ADF4350_REG2_LDP_6ns \| ADF4350_REG2_LDF_INT_N \|
	ADF4350_REG2_CHARGE_PUMP_CURR_uA(5000) \|
	ADF4350_REG2_MUXOUT(0x7) \| ADF4350_REG2_NOISE_MODE(0x3)));

	st->regs[ADF4350_REG3] = pdata->r3_user_settings &
	(ADF4350_REG3_12BIT_CLKDIV(0xFFF) \|
	ADF4350_REG3_12BIT_CLKDIV_MODE(0x3) \|
	ADF4350_REG3_12BIT_CSR_EN \|
	ADF4351_REG3_CHARGE_CANCELLATION_EN \|
	ADF4351_REG3_ANTI_BACKLASH_3ns_EN \|
	ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH);

	st->regs[ADF4350_REG4] =
	ADF4350_REG4_FEEDBACK_FUND \|
	ADF4350_REG4_RF_DIV_SEL(st->r4_rf_div_sel) \|
	ADF4350_REG4_8BIT_BAND_SEL_CLKDIV(band_sel_div) \|
	ADF4350_REG4_RF_OUT_EN \|
	(pdata->r4_user_settings &
	(ADF4350_REG4_OUTPUT_PWR(0x3) \|
	ADF4350_REG4_AUX_OUTPUT_PWR(0x3) \|
	ADF4350_REG4_AUX_OUTPUT_EN \|
	ADF4350_REG4_AUX_OUTPUT_FUND \|
	ADF4350_REG4_MUTE_TILL_LOCK_EN));

	st->regs[ADF4350_REG5] = ADF4350_REG5_LD_PIN_MODE_DIGITAL;
	st->freq_req = freq;

	return adf4350_sync_config(st);
	}

	static ssize_t adf4350_write(struct iio_dev *indio_dev,
	uintptr_t private,
	const struct iio_chan_spec *chan,
	const char *buf, size_t len)
	{
	struct adf4350_state *st = iio_priv(indio_dev);
	unsigned long long readin;
	unsigned long tmp;
	int ret;

	ret = kstrtoull(buf, 10, &readin);
	if (ret)
	return ret;

	mutex_lock(&indio_dev->mlock);
	switch ((u32)private) {
	case ADF4350_FREQ:
	ret = adf4350_set_freq(st, readin);
	break;
	case ADF4350_FREQ_REFIN:
	if (readin > ADF4350_MAX_FREQ_REFIN) {
	ret = -EINVAL;
	break;
	}

	if (st->clk) {
	tmp = clk_round_rate(st->clk, readin);
	if (tmp != readin) {
	ret = -EINVAL;
	break;
	}
	ret = clk_set_rate(st->clk, tmp);
	if (ret < 0)
	break;
	}
	st->clkin = readin;
	ret = adf4350_set_freq(st, st->freq_req);
	break;
	case ADF4350_FREQ_RESOLUTION:
	if (readin == 0)
	ret = -EINVAL;
	else
	st->chspc = readin;
	break;
	case ADF4350_PWRDOWN:
	if (readin)
	st->regs[ADF4350_REG2] \|= ADF4350_REG2_POWER_DOWN_EN;
	else
	st->regs[ADF4350_REG2] &= ~ADF4350_REG2_POWER_DOWN_EN;

	adf4350_sync_config(st);
	break;
	default:
	ret = -EINVAL;
	}
	mutex_unlock(&indio_dev->mlock);

	return ret ? ret : len;
	}

	static ssize_t adf4350_read(struct iio_dev *indio_dev,
	uintptr_t private,
	const struct iio_chan_spec *chan,
	char *buf)
	{
	struct adf4350_state *st = iio_priv(indio_dev);
	unsigned long long val;
	int ret = 0;

	mutex_lock(&indio_dev->mlock);
	switch ((u32)private) {
	case ADF4350_FREQ:
	val = (u64)((st->r0_int * st->r1_mod) + st->r0_fract) *
	(u64)st->fpfd;
	do_div(val, st->r1_mod * (1 << st->r4_rf_div_sel));
	/* PLL unlocked? return error */
	if (gpio_is_valid(st->pdata->gpio_lock_detect))
	if (!gpio_get_value(st->pdata->gpio_lock_detect)) {
	dev_dbg(&st->spi->dev, "PLL un-locked\n");
	ret = -EBUSY;
	}
	break;
	case ADF4350_FREQ_REFIN:
	if (st->clk)
	st->clkin = clk_get_rate(st->clk);

	val = st->clkin;
	break;
	case ADF4350_FREQ_RESOLUTION:
	val = st->chspc;
	break;
	case ADF4350_PWRDOWN:
	val = !!(st->regs[ADF4350_REG2] & ADF4350_REG2_POWER_DOWN_EN);
	break;
	default:
	ret = -EINVAL;
	val = 0;
	}
	mutex_unlock(&indio_dev->mlock);

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

	#define _ADF4350_EXT_INFO(_name, _ident) { \
	.name = _name, \
	.read = adf4350_read, \
	.write = adf4350_write, \
	.private = _ident, \
	}

	static const struct iio_chan_spec_ext_info adf4350_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.
	*/
	_ADF4350_EXT_INFO("frequency", ADF4350_FREQ),
	_ADF4350_EXT_INFO("frequency_resolution", ADF4350_FREQ_RESOLUTION),
	_ADF4350_EXT_INFO("refin_frequency", ADF4350_FREQ_REFIN),
	_ADF4350_EXT_INFO("powerdown", ADF4350_PWRDOWN),
	{ },
	};

	static const struct iio_chan_spec adf4350_chan = {
	.type = IIO_ALTVOLTAGE,
	.indexed = 1,
	.output = 1,
	.ext_info = adf4350_ext_info,
	};

	static const struct iio_info adf4350_info = {
	.debugfs_reg_access = &adf4350_reg_access,
	.driver_module = THIS_MODULE,
	};

	#ifdef CONFIG_OF
	static struct adf4350_platform_data adf4350_parse_dt(struct device dev)
	{
	struct device_node *np = dev->of_node;
	struct adf4350_platform_data *pdata;
	unsigned int tmp;
	int ret;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
	dev_err(dev, "could not allocate memory for platform data\n");
	return NULL;
	}

	strncpy(&pdata->name[0], np->name, SPI_NAME_SIZE - 1);

	tmp = 10000;
	of_property_read_u32(np, "adi,channel-spacing", &tmp);
	pdata->channel_spacing = tmp;

	tmp = 0;
	of_property_read_u32(np, "adi,power-up-frequency", &tmp);
	pdata->power_up_frequency = tmp;

	tmp = 0;
	of_property_read_u32(np, "adi,reference-div-factor", &tmp);
	pdata->ref_div_factor = tmp;

	ret = of_get_gpio(np, 0);
	if (ret < 0)
	pdata->gpio_lock_detect = -1;
	else
	pdata->gpio_lock_detect = ret;

	pdata->ref_doubler_en = of_property_read_bool(np,
	"adi,reference-doubler-enable");
	pdata->ref_div2_en = of_property_read_bool(np,
	"adi,reference-div2-enable");

	/* r2_user_settings */
	pdata->r2_user_settings = of_property_read_bool(np,
	"adi,phase-detector-polarity-positive-enable") ?
	ADF4350_REG2_PD_POLARITY_POS : 0;
	pdata->r2_user_settings \|= of_property_read_bool(np,
	"adi,lock-detect-precision-6ns-enable") ?
	ADF4350_REG2_LDP_6ns : 0;
	pdata->r2_user_settings \|= of_property_read_bool(np,
	"adi,lock-detect-function-integer-n-enable") ?
	ADF4350_REG2_LDF_INT_N : 0;

	tmp = 2500;
	of_property_read_u32(np, "adi,charge-pump-current", &tmp);
	pdata->r2_user_settings \|= ADF4350_REG2_CHARGE_PUMP_CURR_uA(tmp);

	tmp = 0;
	of_property_read_u32(np, "adi,muxout-select", &tmp);
	pdata->r2_user_settings \|= ADF4350_REG2_MUXOUT(tmp);

	pdata->r2_user_settings \|= of_property_read_bool(np,
	"adi,low-spur-mode-enable") ?
	ADF4350_REG2_NOISE_MODE(0x3) : 0;

	/* r3_user_settings */

	pdata->r3_user_settings = of_property_read_bool(np,
	"adi,cycle-slip-reduction-enable") ?
	ADF4350_REG3_12BIT_CSR_EN : 0;
	pdata->r3_user_settings \|= of_property_read_bool(np,
	"adi,charge-cancellation-enable") ?
	ADF4351_REG3_CHARGE_CANCELLATION_EN : 0;

	pdata->r3_user_settings \|= of_property_read_bool(np,
	"adi,anti-backlash-3ns-enable") ?
	ADF4351_REG3_ANTI_BACKLASH_3ns_EN : 0;
	pdata->r3_user_settings \|= of_property_read_bool(np,
	"adi,band-select-clock-mode-high-enable") ?
	ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH : 0;

	tmp = 0;
	of_property_read_u32(np, "adi,12bit-clk-divider", &tmp);
	pdata->r3_user_settings \|= ADF4350_REG3_12BIT_CLKDIV(tmp);

	tmp = 0;
	of_property_read_u32(np, "adi,clk-divider-mode", &tmp);
	pdata->r3_user_settings \|= ADF4350_REG3_12BIT_CLKDIV_MODE(tmp);

	/* r4_user_settings */

	pdata->r4_user_settings = of_property_read_bool(np,
	"adi,aux-output-enable") ?
	ADF4350_REG4_AUX_OUTPUT_EN : 0;
	pdata->r4_user_settings \|= of_property_read_bool(np,
	"adi,aux-output-fundamental-enable") ?
	ADF4350_REG4_AUX_OUTPUT_FUND : 0;
	pdata->r4_user_settings \|= of_property_read_bool(np,
	"adi,mute-till-lock-enable") ?
	ADF4350_REG4_MUTE_TILL_LOCK_EN : 0;

	tmp = 0;
	of_property_read_u32(np, "adi,output-power", &tmp);
	pdata->r4_user_settings \|= ADF4350_REG4_OUTPUT_PWR(tmp);

	tmp = 0;
	of_property_read_u32(np, "adi,aux-output-power", &tmp);
	pdata->r4_user_settings \|= ADF4350_REG4_AUX_OUTPUT_PWR(tmp);

	return pdata;
	}
	#else
	static
	struct adf4350_platform_data adf4350_parse_dt(struct device dev)
	{
	return NULL;
	}
	#endif

	static int adf4350_probe(struct spi_device *spi)
	{
	struct adf4350_platform_data *pdata;
	struct iio_dev *indio_dev;
	struct adf4350_state *st;
	struct clk *clk = NULL;
	int ret;

	if (spi->dev.of_node) {
	pdata = adf4350_parse_dt(&spi->dev);
	if (pdata == NULL)
	return -EINVAL;
	} else {
	pdata = spi->dev.platform_data;
	}

	if (!pdata) {
	dev_warn(&spi->dev, "no platform data? using default\n");
	pdata = &default_pdata;
	}

	if (!pdata->clkin) {
	clk = devm_clk_get(&spi->dev, "clkin");
	if (IS_ERR(clk))
	return -EPROBE_DEFER;

	ret = clk_prepare_enable(clk);
	if (ret < 0)
	return ret;
	}

	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
	if (indio_dev == NULL) {
	ret = -ENOMEM;
	goto error_disable_clk;
	}

	st = iio_priv(indio_dev);

	st->reg = devm_regulator_get(&spi->dev, "vcc");
	if (!IS_ERR(st->reg)) {
	ret = regulator_enable(st->reg);
	if (ret)
	goto error_disable_clk;
	}

	spi_set_drvdata(spi, indio_dev);
	st->spi = spi;
	st->pdata = pdata;

	indio_dev->dev.parent = &spi->dev;
	indio_dev->name = (pdata->name[0] != 0) ? pdata->name :
	spi_get_device_id(spi)->name;

	indio_dev->info = &adf4350_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = &adf4350_chan;
	indio_dev->num_channels = 1;

	st->chspc = pdata->channel_spacing;
	if (clk) {
	st->clk = clk;
	st->clkin = clk_get_rate(clk);
	} else {
	st->clkin = pdata->clkin;
	}

	st->min_out_freq = spi_get_device_id(spi)->driver_data == 4351 ?
	ADF4351_MIN_OUT_FREQ : ADF4350_MIN_OUT_FREQ;

	memset(st->regs_hw, 0xFF, sizeof(st->regs_hw));

	if (gpio_is_valid(pdata->gpio_lock_detect)) {
	ret = devm_gpio_request(&spi->dev, pdata->gpio_lock_detect,
	indio_dev->name);
	if (ret) {
	dev_err(&spi->dev, "fail to request lock detect GPIO-%d",
	pdata->gpio_lock_detect);
	goto error_disable_reg;
	}
	gpio_direction_input(pdata->gpio_lock_detect);
	}

	if (pdata->power_up_frequency) {
	ret = adf4350_set_freq(st, pdata->power_up_frequency);
	if (ret)
	goto error_disable_reg;
	}

	ret = iio_device_register(indio_dev);
	if (ret)
	goto error_disable_reg;

	return 0;

	error_disable_reg:
	if (!IS_ERR(st->reg))
	regulator_disable(st->reg);
	error_disable_clk:
	if (clk)
	clk_disable_unprepare(clk);

	return ret;
	}

	static int adf4350_remove(struct spi_device *spi)
	{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct adf4350_state *st = iio_priv(indio_dev);
	struct regulator *reg = st->reg;

	st->regs[ADF4350_REG2] \|= ADF4350_REG2_POWER_DOWN_EN;
	adf4350_sync_config(st);

	iio_device_unregister(indio_dev);

	if (st->clk)
	clk_disable_unprepare(st->clk);

	if (!IS_ERR(reg)) {
	regulator_disable(reg);
	}

	return 0;
	}

	static const struct spi_device_id adf4350_id[] = {
	{"adf4350", 4350},
	{"adf4351", 4351},
	{}
	};

	static struct spi_driver adf4350_driver = {
	.driver = {
	.name = "adf4350",
	.owner = THIS_MODULE,
	},
	.probe = adf4350_probe,
	.remove = adf4350_remove,
	.id_table = adf4350_id,
	};
	module_spi_driver(adf4350_driver);

	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
	MODULE_DESCRIPTION("Analog Devices ADF4350/ADF4351 PLL");
	MODULE_LICENSE("GPL v2");