Merge tag 'v3.6-rc1-iio-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-linus

IIO fixes for v3.6-rc1

These mostly consist of fixes from Lars-Peter Clausen that were
the first part of a large series reworking the drivers concerned.
Turns out these drivers had quite a wealth of minor bugs.

Also here are some build warning fixes for lm3533-als and
adjd_s111 (both new drives in this cycle).
Final elements are a a div factor overflow and a warning
related fix in a couple of Analog Devices drivers.

All in all nothing major, but a worthwhile bunch of short
fixes.

8 files changed, 116 insertions, 80 deletions

diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index 59fbb3ae40e7..e35bb8f6fe75 100644
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -129,7 +129,7 @@ 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;
+	u32 div_gcd, prescaler, chspc;
 	u16 mdiv, r_cnt = 0;
 	u8 band_sel_div;
 
@@ -158,14 +158,20 @@ static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq)
 	if (pdata->ref_div_factor)
 		r_cnt = pdata->ref_div_factor - 1;
 
-	do  {
-		r_cnt = adf4350_tune_r_cnt(st, r_cnt);
+	chspc = st->chspc;
 
-		st->r1_mod = st->fpfd / st->chspc;
-		while (st->r1_mod > ADF4350_MAX_MODULUS) {
-			r_cnt = adf4350_tune_r_cnt(st, r_cnt);
-			st->r1_mod = st->fpfd / 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 */
@@ -194,7 +200,7 @@ static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq)
 	st->regs[ADF4350_REG0] = ADF4350_REG0_INT(st->r0_int) |
 				 ADF4350_REG0_FRACT(st->r0_fract);
 
-	st->regs[ADF4350_REG1] = ADF4350_REG1_PHASE(0) |
+	st->regs[ADF4350_REG1] = ADF4350_REG1_PHASE(1) |
 				 ADF4350_REG1_MOD(st->r1_mod) |
 				 prescaler;
 
diff --git a/drivers/iio/light/adjd_s311.c b/drivers/iio/light/adjd_s311.c
index 1cbb449b319a..9a99f43094f0 100644
--- a/drivers/iio/light/adjd_s311.c
+++ b/drivers/iio/light/adjd_s311.c
@@ -271,9 +271,10 @@ static int adjd_s311_update_scan_mode(struct iio_dev *indio_dev,
 	const unsigned long *scan_mask)
 {
 	struct adjd_s311_data *data = iio_priv(indio_dev);
-	data->buffer = krealloc(data->buffer, indio_dev->scan_bytes,
-				GFP_KERNEL);
-	if (!data->buffer)
+
+	kfree(data->buffer);
+	data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+	if (data->buffer == NULL)
 		return -ENOMEM;
 
 	return 0;
diff --git a/drivers/iio/light/lm3533-als.c b/drivers/iio/light/lm3533-als.c
index c3e7bac13123..e45712a921ce 100644
--- a/drivers/iio/light/lm3533-als.c
+++ b/drivers/iio/light/lm3533-als.c
@@ -404,7 +404,7 @@ out:
 	return ret;
 }
 
-static int show_thresh_either_en(struct device *dev,
+static ssize_t show_thresh_either_en(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
 {
@@ -424,7 +424,7 @@ static int show_thresh_either_en(struct device *dev,
 	return scnprintf(buf, PAGE_SIZE, "%u\n", enable);
 }
 
-static int store_thresh_either_en(struct device *dev,
+static ssize_t store_thresh_either_en(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
index 22c3923d55eb..095837285f4f 100644
--- a/drivers/staging/iio/adc/ad7192.c
+++ b/drivers/staging/iio/adc/ad7192.c
@@ -754,7 +754,7 @@ static ssize_t ad7192_set(struct device *dev,
 		else
 			st->mode &= ~AD7192_MODE_ACX;
 
-		ad7192_write_reg(st, AD7192_REG_GPOCON, 3, st->mode);
+		ad7192_write_reg(st, AD7192_REG_MODE, 3, st->mode);
 		break;
 	default:
 		ret = -EINVAL;
@@ -798,6 +798,11 @@ static const struct attribute_group ad7195_attribute_group = {
 	.attrs = ad7195_attributes,
 };
 
+static unsigned int ad7192_get_temp_scale(bool unipolar)
+{
+	return unipolar ? 2815 * 2 : 2815;
+}
+
 static int ad7192_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val,
@@ -824,19 +829,6 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
 		*val = (smpl >> chan->scan_type.shift) &
 			((1 << (chan->scan_type.realbits)) - 1);
 
-		switch (chan->type) {
-		case IIO_VOLTAGE:
-			if (!unipolar)
-				*val -= (1 << (chan->scan_type.realbits - 1));
-			break;
-		case IIO_TEMP:
-			*val -= 0x800000;
-			*val /= 2815; /* temp Kelvin */
-			*val -= 273; /* temp Celsius */
-			break;
-		default:
-			return -EINVAL;
-		}
 		return IIO_VAL_INT;
 
 	case IIO_CHAN_INFO_SCALE:
@@ -848,11 +840,21 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
 			mutex_unlock(&indio_dev->mlock);
 			return IIO_VAL_INT_PLUS_NANO;
 		case IIO_TEMP:
-			*val =  1000;
-			return IIO_VAL_INT;
+			*val = 0;
+			*val2 = 1000000000 / ad7192_get_temp_scale(unipolar);
+			return IIO_VAL_INT_PLUS_NANO;
 		default:
 			return -EINVAL;
 		}
+	case IIO_CHAN_INFO_OFFSET:
+		if (!unipolar)
+			*val = -(1 << (chan->scan_type.realbits - 1));
+		else
+			*val = 0;
+		/* Kelvin to Celsius */
+		if (chan->type == IIO_TEMP)
+			*val -= 273 * ad7192_get_temp_scale(unipolar);
+		return IIO_VAL_INT;
 	}
 
 	return -EINVAL;
@@ -890,7 +892,7 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
 				}
 				ret = 0;
 			}
-
+		break;
 	default:
 		ret = -EINVAL;
 	}
@@ -942,20 +944,22 @@ static const struct iio_info ad7195_info = {
 	  .channel = _chan,						\
 	  .channel2 = _chan2,						\
 	  .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |			\
-	  IIO_CHAN_INFO_SCALE_SHARED_BIT,				\
+	  IIO_CHAN_INFO_SCALE_SHARED_BIT |				\
+	  IIO_CHAN_INFO_OFFSET_SHARED_BIT,				\
 	  .address = _address,						\
 	  .scan_index = _si,						\
-	  .scan_type =  IIO_ST('s', 24, 32, 0)}
+	  .scan_type =  IIO_ST('u', 24, 32, 0)}
 
 #define AD7192_CHAN(_chan, _address, _si)				\
 	{ .type = IIO_VOLTAGE,						\
 	  .indexed = 1,							\
 	  .channel = _chan,						\
 	  .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |			\
-	  IIO_CHAN_INFO_SCALE_SHARED_BIT,				\
+	  IIO_CHAN_INFO_SCALE_SHARED_BIT |				\
+	  IIO_CHAN_INFO_OFFSET_SHARED_BIT,				\
 	  .address = _address,						\
 	  .scan_index = _si,						\
-	  .scan_type =  IIO_ST('s', 24, 32, 0)}
+	  .scan_type =  IIO_ST('u', 24, 32, 0)}
 
 #define AD7192_CHAN_TEMP(_chan, _address, _si)				\
 	{ .type = IIO_TEMP,						\
@@ -965,7 +969,7 @@ static const struct iio_info ad7195_info = {
 	  IIO_CHAN_INFO_SCALE_SEPARATE_BIT,				\
 	  .address = _address,						\
 	  .scan_index = _si,						\
-	  .scan_type =  IIO_ST('s', 24, 32, 0)}
+	  .scan_type =  IIO_ST('u', 24, 32, 0)}
 
 static struct iio_chan_spec ad7192_channels[] = {
 	AD7192_CHAN_DIFF(1, 2, NULL, AD7192_CH_AIN1P_AIN2M, 0),
diff --git a/drivers/staging/iio/adc/ad7298_ring.c b/drivers/staging/iio/adc/ad7298_ring.c
index fd1d855ff57a..506016f01593 100644
--- a/drivers/staging/iio/adc/ad7298_ring.c
+++ b/drivers/staging/iio/adc/ad7298_ring.c
@@ -76,7 +76,7 @@ static irqreturn_t ad7298_trigger_handler(int irq, void *p)
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct ad7298_state *st = iio_priv(indio_dev);
 	struct iio_buffer *ring = indio_dev->buffer;
-	s64 time_ns;
+	s64 time_ns = 0;
 	__u16 buf[16];
 	int b_sent, i;
 
diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index 1ece2ac8de56..19ee49c95de4 100644
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -131,9 +131,10 @@ static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
 			.indexed = 1,
 			.channel = 0,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_type = {
-				.sign = 's',
+				.sign = 'u',
 				.realbits = 24,
 				.storagebits = 32,
 				.shift = 8,
@@ -146,9 +147,10 @@ static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
 			.indexed = 1,
 			.channel = 0,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_type = {
-				.sign = 's',
+				.sign = 'u',
 				.realbits = 20,
 				.storagebits = 32,
 				.shift = 12,
diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c
index 76fdd7145fc5..112e2b7b5bc4 100644
--- a/drivers/staging/iio/adc/ad7793.c
+++ b/drivers/staging/iio/adc/ad7793.c
@@ -563,8 +563,9 @@ static ssize_t ad7793_show_scale_available(struct device *dev,
 	return len;
 }
 
-static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available, in-in_scale_available,
-			     S_IRUGO, ad7793_show_scale_available, NULL, 0);
+static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available,
+		in_voltage-voltage_scale_available, S_IRUGO,
+		ad7793_show_scale_available, NULL, 0);
 
 static struct attribute *ad7793_attributes[] = {
 	&iio_dev_attr_sampling_frequency.dev_attr.attr,
@@ -604,9 +605,6 @@ static int ad7793_read_raw(struct iio_dev *indio_dev,
 		*val = (smpl >> chan->scan_type.shift) &
 			((1 << (chan->scan_type.realbits)) - 1);
 
-		if (!unipolar)
-			*val -= (1 << (chan->scan_type.realbits - 1));
-
 		return IIO_VAL_INT;
 
 	case IIO_CHAN_INFO_SCALE:
@@ -620,25 +618,38 @@ static int ad7793_read_raw(struct iio_dev *indio_dev,
 				return IIO_VAL_INT_PLUS_NANO;
 			} else {
 				/* 1170mV / 2^23 * 6 */
-				scale_uv = (1170ULL * 100000000ULL * 6ULL)
-					>> (chan->scan_type.realbits -
-					    (unipolar ? 0 : 1));
+				scale_uv = (1170ULL * 100000000ULL * 6ULL);
 			}
 			break;
 		case IIO_TEMP:
-			/* Always uses unity gain and internal ref */
-			scale_uv = (2500ULL * 100000000ULL)
-				>> (chan->scan_type.realbits -
-				(unipolar ? 0 : 1));
+				/* 1170mV / 0.81 mV/C / 2^23 */
+				scale_uv = 1444444444444ULL;
 			break;
 		default:
 			return -EINVAL;
 		}
 
-		*val2 = do_div(scale_uv, 100000000) * 10;
-		*val =  scale_uv;
-
+		scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1));
+		*val = 0;
+		*val2 = scale_uv;
 		return IIO_VAL_INT_PLUS_NANO;
+	case IIO_CHAN_INFO_OFFSET:
+		if (!unipolar)
+			*val = -(1 << (chan->scan_type.realbits - 1));
+		else
+			*val = 0;
+
+		/* Kelvin to Celsius */
+		if (chan->type == IIO_TEMP) {
+			unsigned long long offset;
+			unsigned int shift;
+
+			shift = chan->scan_type.realbits - (unipolar ? 0 : 1);
+			offset = 273ULL << shift;
+			do_div(offset, 1444);
+			*val -= offset;
+		}
+		return IIO_VAL_INT;
 	}
 	return -EINVAL;
 }
@@ -676,7 +687,7 @@ static int ad7793_write_raw(struct iio_dev *indio_dev,
 				}
 				ret = 0;
 			}
-
+		break;
 	default:
 		ret = -EINVAL;
 	}
@@ -720,9 +731,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 0,
 			.address = AD7793_CH_AIN1P_AIN1M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 0,
-			.scan_type = IIO_ST('s', 24, 32, 0)
+			.scan_type = IIO_ST('u', 24, 32, 0)
 		},
 		.channel[1] = {
 			.type = IIO_VOLTAGE,
@@ -732,9 +744,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 1,
 			.address = AD7793_CH_AIN2P_AIN2M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 1,
-			.scan_type = IIO_ST('s', 24, 32, 0)
+			.scan_type = IIO_ST('u', 24, 32, 0)
 		},
 		.channel[2] = {
 			.type = IIO_VOLTAGE,
@@ -744,9 +757,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 2,
 			.address = AD7793_CH_AIN3P_AIN3M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 2,
-			.scan_type = IIO_ST('s', 24, 32, 0)
+			.scan_type = IIO_ST('u', 24, 32, 0)
 		},
 		.channel[3] = {
 			.type = IIO_VOLTAGE,
@@ -757,9 +771,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 2,
 			.address = AD7793_CH_AIN1M_AIN1M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 3,
-			.scan_type = IIO_ST('s', 24, 32, 0)
+			.scan_type = IIO_ST('u', 24, 32, 0)
 		},
 		.channel[4] = {
 			.type = IIO_TEMP,
@@ -769,7 +784,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
 			IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
 			.scan_index = 4,
-			.scan_type = IIO_ST('s', 24, 32, 0),
+			.scan_type = IIO_ST('u', 24, 32, 0),
 		},
 		.channel[5] = {
 			.type = IIO_VOLTAGE,
@@ -778,9 +793,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel = 4,
 			.address = AD7793_CH_AVDD_MONITOR,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
+			IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 5,
-			.scan_type = IIO_ST('s', 24, 32, 0),
+			.scan_type = IIO_ST('u', 24, 32, 0),
 		},
 		.channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6),
 	},
@@ -793,9 +809,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 0,
 			.address = AD7793_CH_AIN1P_AIN1M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 0,
-			.scan_type = IIO_ST('s', 16, 32, 0)
+			.scan_type = IIO_ST('u', 16, 32, 0)
 		},
 		.channel[1] = {
 			.type = IIO_VOLTAGE,
@@ -805,9 +822,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 1,
 			.address = AD7793_CH_AIN2P_AIN2M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 1,
-			.scan_type = IIO_ST('s', 16, 32, 0)
+			.scan_type = IIO_ST('u', 16, 32, 0)
 		},
 		.channel[2] = {
 			.type = IIO_VOLTAGE,
@@ -817,9 +835,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 2,
 			.address = AD7793_CH_AIN3P_AIN3M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 2,
-			.scan_type = IIO_ST('s', 16, 32, 0)
+			.scan_type = IIO_ST('u', 16, 32, 0)
 		},
 		.channel[3] = {
 			.type = IIO_VOLTAGE,
@@ -830,9 +849,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel2 = 2,
 			.address = AD7793_CH_AIN1M_AIN1M,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SHARED_BIT,
+			IIO_CHAN_INFO_SCALE_SHARED_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 3,
-			.scan_type = IIO_ST('s', 16, 32, 0)
+			.scan_type = IIO_ST('u', 16, 32, 0)
 		},
 		.channel[4] = {
 			.type = IIO_TEMP,
@@ -842,7 +862,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
 			IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
 			.scan_index = 4,
-			.scan_type = IIO_ST('s', 16, 32, 0),
+			.scan_type = IIO_ST('u', 16, 32, 0),
 		},
 		.channel[5] = {
 			.type = IIO_VOLTAGE,
@@ -851,9 +871,10 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 			.channel = 4,
 			.address = AD7793_CH_AVDD_MONITOR,
 			.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-			IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
+			IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
+			IIO_CHAN_INFO_OFFSET_SHARED_BIT,
 			.scan_index = 5,
-			.scan_type = IIO_ST('s', 16, 32, 0),
+			.scan_type = IIO_ST('u', 16, 32, 0),
 		},
 		.channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6),
 	},
@@ -901,7 +922,7 @@ static int __devinit ad7793_probe(struct spi_device *spi)
 	else if (voltage_uv)
 		st->int_vref_mv = voltage_uv / 1000;
 	else
-		st->int_vref_mv = 2500; /* Build-in ref */
+		st->int_vref_mv = 1170; /* Build-in ref */
 
 	spi_set_drvdata(spi, indio_dev);
 	st->spi = spi;
diff --git a/include/linux/iio/frequency/adf4350.h b/include/linux/iio/frequency/adf4350.h
index b76b4a87065e..be91f344d5fc 100644
--- a/include/linux/iio/frequency/adf4350.h
+++ b/include/linux/iio/frequency/adf4350.h
@@ -87,6 +87,8 @@
 #define ADF4350_MAX_BANDSEL_CLK		125000 /* Hz */
 #define ADF4350_MAX_FREQ_REFIN		250000000 /* Hz */
 #define ADF4350_MAX_MODULUS		4095
+#define ADF4350_MAX_R_CNT		1023
+
 
 /**
  * struct adf4350_platform_data - platform specific information