diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
index 5744f1673cba..2b728863a3ff 100644
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ b/drivers/staging/iio/resolver/ad2s1210.c
@@ -51,12 +51,11 @@
 #define AD2S1210_MIN_CLKIN	6144000
 #define AD2S1210_MAX_CLKIN	10240000
 #define AD2S1210_MIN_EXCIT	2000
+#define AD2S1210_DEF_EXCIT	10000
 #define AD2S1210_MAX_EXCIT	20000
 #define AD2S1210_MIN_FCW	0x4
 #define AD2S1210_MAX_FCW	0x50
 
-#define AD2S1210_DEF_EXCIT	10000
-
 enum ad2s1210_mode {
 	MOD_POS = 0b00,
 	MOD_VEL = 0b01,
@@ -189,18 +188,32 @@ static int ad2s1210_regmap_reg_read(void *context, unsigned int reg,
 	return 0;
 }
 
-static inline
-int ad2s1210_update_frequency_control_word(struct ad2s1210_state *st)
+/*
+ * Sets the excitation frequency and performs software reset.
+ *
+ * Must be called with lock held.
+ */
+static int ad2s1210_reinit_excitation_frequency(struct ad2s1210_state *st,
+						u16 fexcit)
 {
-	unsigned char fcw;
+	int ret;
+	u8 fcw;
 
-	fcw = (unsigned char)(st->fexcit * (1 << 15) / st->clkin_hz);
-	if (fcw < AD2S1210_MIN_FCW || fcw > AD2S1210_MAX_FCW) {
-		dev_err(&st->sdev->dev, "ad2s1210: FCW out of range\n");
+	fcw = fexcit * (1 << 15) / st->clkin_hz;
+	if (fcw < AD2S1210_MIN_FCW || fcw > AD2S1210_MAX_FCW)
 		return -ERANGE;
-	}
 
-	return regmap_write(st->regmap, AD2S1210_REG_EXCIT_FREQ, fcw);
+	ret = regmap_write(st->regmap, AD2S1210_REG_EXCIT_FREQ, fcw);
+	if (ret < 0)
+		return ret;
+
+	st->fexcit = fexcit;
+
+	/*
+	 * Software reset reinitializes the excitation frequency output.
+	 * It does not reset any of the configuration registers.
+	 */
+	return regmap_write(st->regmap, AD2S1210_REG_SOFT_RESET, 0);
 }
 
 static int ad2s1210_set_resolution_gpios(struct ad2s1210_state *st,
@@ -215,11 +228,6 @@ static int ad2s1210_set_resolution_gpios(struct ad2s1210_state *st,
 				     bitmap);
 }
 
-static inline int ad2s1210_soft_reset(struct ad2s1210_state *st)
-{
-	return regmap_write(st->regmap, AD2S1210_REG_SOFT_RESET, 0);
-}
-
 static ssize_t ad2s1210_show_fexcit(struct device *dev,
 				    struct device_attribute *attr,
 				    char *buf)
@@ -234,27 +242,24 @@ static ssize_t ad2s1210_store_fexcit(struct device *dev,
 				     const char *buf, size_t len)
 {
 	struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
-	unsigned int fexcit;
+	u16 fexcit;
 	int ret;
 
-	ret = kstrtouint(buf, 10, &fexcit);
-	if (ret < 0)
-		return ret;
-	if (fexcit < AD2S1210_MIN_EXCIT || fexcit > AD2S1210_MAX_EXCIT) {
-		dev_err(dev,
-			"ad2s1210: excitation frequency out of range\n");
+	ret = kstrtou16(buf, 10, &fexcit);
+	if (ret < 0 || fexcit < AD2S1210_MIN_EXCIT || fexcit > AD2S1210_MAX_EXCIT)
 		return -EINVAL;
-	}
+
 	mutex_lock(&st->lock);
-	st->fexcit = fexcit;
-	ret = ad2s1210_update_frequency_control_word(st);
+	ret = ad2s1210_reinit_excitation_frequency(st, fexcit);
 	if (ret < 0)
 		goto error_ret;
-	ret = ad2s1210_soft_reset(st);
+
+	ret = len;
+
 error_ret:
 	mutex_unlock(&st->lock);
 
-	return ret < 0 ? ret : len;
+	return ret;
 }
 
 static ssize_t ad2s1210_show_resolution(struct device *dev,
@@ -551,10 +556,8 @@ static int ad2s1210_initial(struct ad2s1210_state *st)
 	if (ret < 0)
 		goto error_ret;
 
-	ret = ad2s1210_update_frequency_control_word(st);
-	if (ret < 0)
-		goto error_ret;
-	ret = ad2s1210_soft_reset(st);
+	ret = ad2s1210_reinit_excitation_frequency(st, AD2S1210_DEF_EXCIT);
+
 error_ret:
 	mutex_unlock(&st->lock);
 	return ret;
@@ -698,7 +701,6 @@ static int ad2s1210_probe(struct spi_device *spi)
 	st->sdev = spi;
 	st->hysteresis = true;
 	st->resolution = 12;
-	st->fexcit = AD2S1210_DEF_EXCIT;
 
 	ret = ad2s1210_setup_clocks(st);
 	if (ret < 0)