Message-Id: <20240423-dev-add_dev_errp_probe-v2-2-12f43c5d8b0d@analog.com>
Date: Tue, 23 Apr 2024 17:20:31 +0200
From: Nuno Sa via B4 Relay <devnull+nuno.sa.analog.com@...nel.org>
To: Petr Mladek <pmladek@...e.com>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Chris Down <chris@...isdown.name>, John Ogness <john.ogness@...utronix.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, 
 Olivier Moysan <olivier.moysan@...s.st.com>, 
 Andi Shyti <andi.shyti@...nel.org>, Jyoti Bhayana <jbhayana@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
 Nuno Sa <nuno.sa@...log.com>
Subject: [PATCH v2 2/4] iio: temperature: ltc2983: convert to
 dev_err_probe()

From: Nuno Sa <nuno.sa@...log.com>

Use dev_err_probe() in the probe() path. While at it, made some simple
improvements:
 * Declare a struct device *dev helper. This also makes the style more
   consistent (some places the helper was used and not in other places);
 * Explicitly included the err.h and errno.h headers;
 * Removed an useless else if();
 * Removed some unnecessary line breaks.

Signed-off-by: Nuno Sa <nuno.sa@...log.com>
---
 drivers/iio/temperature/ltc2983.c | 282 +++++++++++++++++---------------------
 1 file changed, 127 insertions(+), 155 deletions(-)

diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
index 24d19f3c7292..941b3ab5c927 100644
--- a/drivers/iio/temperature/ltc2983.c
+++ b/drivers/iio/temperature/ltc2983.c
@@ -8,6 +8,8 @@
 #include <linux/bitfield.h>
 #include <linux/completion.h>
 #include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/iio/iio.h>
 #include <linux/interrupt.h>
@@ -432,10 +434,9 @@ __ltc2983_custom_sensor_new(struct ltc2983_data *st, const struct fwnode_handle
 	else
 		n_entries = fwnode_property_count_u64(fn, propname);
 	/* n_entries must be an even number */
-	if (!n_entries || (n_entries % 2) != 0) {
-		dev_err(dev, "Number of entries either 0 or not even\n");
-		return ERR_PTR(-EINVAL);
-	}
+	if (!n_entries || (n_entries % 2) != 0)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Number of entries either 0 or not even\n");
 
 	new_custom = devm_kzalloc(dev, sizeof(*new_custom), GFP_KERNEL);
 	if (!new_custom)
@@ -443,19 +444,17 @@ __ltc2983_custom_sensor_new(struct ltc2983_data *st, const struct fwnode_handle
 
 	new_custom->size = n_entries * n_size;
 	/* check Steinhart size */
-	if (is_steinhart && new_custom->size != LTC2983_CUSTOM_STEINHART_SIZE) {
-		dev_err(dev, "Steinhart sensors size(%zu) must be %u\n", new_custom->size,
-			LTC2983_CUSTOM_STEINHART_SIZE);
-		return ERR_PTR(-EINVAL);
-	}
+	if (is_steinhart && new_custom->size != LTC2983_CUSTOM_STEINHART_SIZE)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Steinhart sensors size(%zu) must be %u\n",
+					 new_custom->size, LTC2983_CUSTOM_STEINHART_SIZE);
+
 	/* Check space on the table. */
 	if (st->custom_table_size + new_custom->size >
-	    (LTC2983_CUST_SENS_TBL_END_REG -
-	     LTC2983_CUST_SENS_TBL_START_REG) + 1) {
-		dev_err(dev, "No space left(%d) for new custom sensor(%zu)",
-				st->custom_table_size, new_custom->size);
-		return ERR_PTR(-EINVAL);
-	}
+	    (LTC2983_CUST_SENS_TBL_END_REG - LTC2983_CUST_SENS_TBL_START_REG) + 1)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "No space left(%d) for new custom sensor(%zu)",
+					 st->custom_table_size, new_custom->size);
 
 	/* allocate the table */
 	if (is_steinhart)
@@ -658,10 +657,11 @@ ltc2983_thermocouple_new(const struct fwnode_handle *child, struct ltc2983_data
 			 const struct ltc2983_sensor *sensor)
 {
 	struct ltc2983_thermocouple *thermo;
+	struct device *dev = &st->spi->dev;
 	u32 oc_current;
 	int ret;
 
-	thermo = devm_kzalloc(&st->spi->dev, sizeof(*thermo), GFP_KERNEL);
+	thermo = devm_kzalloc(dev, sizeof(*thermo), GFP_KERNEL);
 	if (!thermo)
 		return ERR_PTR(-ENOMEM);
 
@@ -688,21 +688,19 @@ ltc2983_thermocouple_new(const struct fwnode_handle *child, struct ltc2983_data
 					LTC2983_THERMOCOUPLE_OC_CURR(3);
 			break;
 		default:
-			dev_err(&st->spi->dev,
-				"Invalid open circuit current:%u", oc_current);
-			return ERR_PTR(-EINVAL);
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid open circuit current:%u",
+					      oc_current);
 		}
 
 		thermo->sensor_config |= LTC2983_THERMOCOUPLE_OC_CHECK(1);
 	}
 	/* validate channel index */
 	if (!(thermo->sensor_config & LTC2983_THERMOCOUPLE_DIFF_MASK) &&
-	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
-		dev_err(&st->spi->dev,
-			"Invalid chann:%d for differential thermocouple",
-			sensor->chan);
-		return ERR_PTR(-EINVAL);
-	}
+	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+				      "Invalid chann:%d for differential thermocouple",
+				      sensor->chan);
 
 	struct fwnode_handle *ref __free(fwnode_handle) =
 		fwnode_find_reference(child, "adi,cold-junction-handle", 0);
@@ -710,14 +708,13 @@ ltc2983_thermocouple_new(const struct fwnode_handle *child, struct ltc2983_data
 		ref = NULL;
 	} else {
 		ret = fwnode_property_read_u32(ref, "reg", &thermo->cold_junction_chan);
-		if (ret) {
+		if (ret)
 			/*
 			 * This would be catched later but we can just return
 			 * the error right away.
 			 */
-			dev_err(&st->spi->dev, "Property reg must be given\n");
-			return ERR_PTR(ret);
-		}
+			return dev_err_ptr_probe(dev, ret,
+					      "Property reg must be given\n");
 	}
 
 	/* check custom sensor */
@@ -753,16 +750,14 @@ ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
 
 	struct fwnode_handle *ref __free(fwnode_handle) =
 		fwnode_find_reference(child, "adi,rsense-handle", 0);
-	if (IS_ERR(ref)) {
-		dev_err(dev, "Property adi,rsense-handle missing or invalid");
-		return ERR_CAST(ref);
-	}
+	if (IS_ERR(ref))
+		return dev_err_cast_probe(dev, ref,
+					  "Property adi,rsense-handle missing or invalid");
 
 	ret = fwnode_property_read_u32(ref, "reg", &rtd->r_sense_chan);
-	if (ret) {
-		dev_err(dev, "Property reg must be given\n");
-		return ERR_PTR(ret);
-	}
+	if (ret)
+		return dev_err_ptr_probe(dev, ret,
+				      "Property reg must be given\n");
 
 	ret = fwnode_property_read_u32(child, "adi,number-of-wires", &n_wires);
 	if (!ret) {
@@ -781,19 +776,19 @@ ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
 			rtd->sensor_config = LTC2983_RTD_N_WIRES(3);
 			break;
 		default:
-			dev_err(dev, "Invalid number of wires:%u\n", n_wires);
-			return ERR_PTR(-EINVAL);
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid number of wires:%u\n",
+					      n_wires);
 		}
 	}
 
 	if (fwnode_property_read_bool(child, "adi,rsense-share")) {
 		/* Current rotation is only available with rsense sharing */
 		if (fwnode_property_read_bool(child, "adi,current-rotate")) {
-			if (n_wires == 2 || n_wires == 3) {
-				dev_err(dev,
-					"Rotation not allowed for 2/3 Wire RTDs");
-				return ERR_PTR(-EINVAL);
-			}
+			if (n_wires == 2 || n_wires == 3)
+				return dev_err_ptr_probe(dev, -EINVAL,
+						      "Rotation not allowed for 2/3 Wire RTDs");
+
 			rtd->sensor_config |= LTC2983_RTD_C_ROTATE(1);
 		} else {
 			rtd->sensor_config |= LTC2983_RTD_R_SHARE(1);
@@ -816,29 +811,22 @@ ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
 
 		if (((rtd->sensor_config & LTC2983_RTD_KELVIN_R_SENSE_MASK)
 		     == LTC2983_RTD_KELVIN_R_SENSE_MASK) &&
-		    (rtd->r_sense_chan <=  min)) {
+		    (rtd->r_sense_chan <=  min))
 			/* kelvin rsense*/
-			dev_err(dev,
-				"Invalid rsense chann:%d to use in kelvin rsense",
-				rtd->r_sense_chan);
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid rsense chann:%d to use in kelvin rsense",
+					      rtd->r_sense_chan);
 
-			return ERR_PTR(-EINVAL);
-		}
-
-		if (sensor->chan < min || sensor->chan > max) {
-			dev_err(dev, "Invalid chann:%d for the rtd config",
-				sensor->chan);
-
-			return ERR_PTR(-EINVAL);
-		}
+		if (sensor->chan < min || sensor->chan > max)
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid chann:%d for the rtd config",
+					      sensor->chan);
 	} else {
 		/* same as differential case */
-		if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
-			dev_err(&st->spi->dev,
-				"Invalid chann:%d for RTD", sensor->chan);
-
-			return ERR_PTR(-EINVAL);
-		}
+		if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid chann:%d for RTD",
+					      sensor->chan);
 	}
 
 	/* check custom sensor */
@@ -886,10 +874,9 @@ ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
 			rtd->excitation_current = 0x08;
 			break;
 		default:
-			dev_err(&st->spi->dev,
-				"Invalid value for excitation current(%u)",
-				excitation_current);
-			return ERR_PTR(-EINVAL);
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid value for excitation current(%u)",
+					      excitation_current);
 		}
 	}
 
@@ -913,16 +900,14 @@ ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *s
 
 	struct fwnode_handle *ref __free(fwnode_handle) =
 		fwnode_find_reference(child, "adi,rsense-handle", 0);
-	if (IS_ERR(ref)) {
-		dev_err(dev, "Property adi,rsense-handle missing or invalid");
-		return ERR_CAST(ref);
-	}
+	if (IS_ERR(ref))
+		return dev_err_cast_probe(dev, ref,
+					  "Property adi,rsense-handle missing or invalid");
 
 	ret = fwnode_property_read_u32(ref, "reg", &thermistor->r_sense_chan);
-	if (ret) {
-		dev_err(dev, "rsense channel must be configured...\n");
-		return ERR_PTR(ret);
-	}
+	if (ret)
+		return dev_err_ptr_probe(dev, ret,
+					 "rsense channel must be configured...\n");
 
 	if (fwnode_property_read_bool(child, "adi,single-ended")) {
 		thermistor->sensor_config = LTC2983_THERMISTOR_SGL(1);
@@ -937,12 +922,10 @@ ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *s
 	}
 	/* validate channel index */
 	if (!(thermistor->sensor_config & LTC2983_THERMISTOR_DIFF_MASK) &&
-	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
-		dev_err(&st->spi->dev,
-			"Invalid chann:%d for differential thermistor",
-			sensor->chan);
-		return ERR_PTR(-EINVAL);
-	}
+	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+				      "Invalid chann:%d for differential thermistor",
+				      sensor->chan);
 
 	/* check custom sensor */
 	if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART) {
@@ -981,12 +964,10 @@ ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *s
 		switch (excitation_current) {
 		case 0:
 			/* auto range */
-			if (sensor->type >=
-			    LTC2983_SENSOR_THERMISTOR_STEINHART) {
-				dev_err(&st->spi->dev,
-					"Auto Range not allowed for custom sensors\n");
-				return ERR_PTR(-EINVAL);
-			}
+			if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART)
+				return dev_err_ptr_probe(dev, -EINVAL,
+						      "Auto Range not allowed for custom sensors\n");
+
 			thermistor->excitation_current = 0x0c;
 			break;
 		case 250:
@@ -1023,10 +1004,9 @@ ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *s
 			thermistor->excitation_current = 0x0b;
 			break;
 		default:
-			dev_err(&st->spi->dev,
-				"Invalid value for excitation current(%u)",
-				excitation_current);
-			return ERR_PTR(-EINVAL);
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid value for excitation current(%u)",
+					      excitation_current);
 		}
 	}
 
@@ -1037,11 +1017,12 @@ static struct ltc2983_sensor *
 ltc2983_diode_new(const struct fwnode_handle *child, const struct ltc2983_data *st,
 		  const struct ltc2983_sensor *sensor)
 {
+	struct device *dev = &st->spi->dev;
 	struct ltc2983_diode *diode;
 	u32 temp = 0, excitation_current = 0;
 	int ret;
 
-	diode = devm_kzalloc(&st->spi->dev, sizeof(*diode), GFP_KERNEL);
+	diode = devm_kzalloc(dev, sizeof(*diode), GFP_KERNEL);
 	if (!diode)
 		return ERR_PTR(-ENOMEM);
 
@@ -1056,12 +1037,11 @@ ltc2983_diode_new(const struct fwnode_handle *child, const struct ltc2983_data *
 
 	/* validate channel index */
 	if (!(diode->sensor_config & LTC2983_DIODE_DIFF_MASK) &&
-	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
-		dev_err(&st->spi->dev,
-			"Invalid chann:%d for differential thermistor",
-			sensor->chan);
-		return ERR_PTR(-EINVAL);
-	}
+	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+				      "Invalid chann:%d for differential thermistor",
+				      sensor->chan);
+
 	/* set common parameters */
 	diode->sensor.fault_handler = ltc2983_common_fault_handler;
 	diode->sensor.assign_chan = ltc2983_diode_assign_chan;
@@ -1083,10 +1063,9 @@ ltc2983_diode_new(const struct fwnode_handle *child, const struct ltc2983_data *
 			diode->excitation_current = 0x03;
 			break;
 		default:
-			dev_err(&st->spi->dev,
-				"Invalid value for excitation current(%u)",
-				excitation_current);
-			return ERR_PTR(-EINVAL);
+			return dev_err_ptr_probe(dev, -EINVAL,
+					      "Invalid value for excitation current(%u)",
+					      excitation_current);
 		}
 	}
 
@@ -1102,26 +1081,26 @@ static struct ltc2983_sensor *ltc2983_r_sense_new(struct fwnode_handle *child,
 					struct ltc2983_data *st,
 					const struct ltc2983_sensor *sensor)
 {
+	struct device *dev = &st->spi->dev;
 	struct ltc2983_rsense *rsense;
 	int ret;
 	u32 temp;
 
-	rsense = devm_kzalloc(&st->spi->dev, sizeof(*rsense), GFP_KERNEL);
+	rsense = devm_kzalloc(dev, sizeof(*rsense), GFP_KERNEL);
 	if (!rsense)
 		return ERR_PTR(-ENOMEM);
 
 	/* validate channel index */
-	if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
-		dev_err(&st->spi->dev, "Invalid chann:%d for r_sense",
-			sensor->chan);
-		return ERR_PTR(-EINVAL);
-	}
+	if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+				      "Invalid chann:%d for r_sense",
+				      sensor->chan);
 
 	ret = fwnode_property_read_u32(child, "adi,rsense-val-milli-ohms", &temp);
-	if (ret) {
-		dev_err(&st->spi->dev, "Property adi,rsense-val-milli-ohms missing\n");
-		return ERR_PTR(-EINVAL);
-	}
+	if (ret)
+		return dev_err_ptr_probe(dev, -EINVAL,
+				      "Property adi,rsense-val-milli-ohms missing\n");
+
 	/*
 	 * Times 1000 because we have milli-ohms and __convert_to_raw
 	 * expects scales of 1000000 which are used for all other
@@ -1140,21 +1119,21 @@ static struct ltc2983_sensor *ltc2983_adc_new(struct fwnode_handle *child,
 					 struct ltc2983_data *st,
 					 const struct ltc2983_sensor *sensor)
 {
+	struct device *dev = &st->spi->dev;
 	struct ltc2983_adc *adc;
 
-	adc = devm_kzalloc(&st->spi->dev, sizeof(*adc), GFP_KERNEL);
+	adc = devm_kzalloc(dev, sizeof(*adc), GFP_KERNEL);
 	if (!adc)
 		return ERR_PTR(-ENOMEM);
 
 	if (fwnode_property_read_bool(child, "adi,single-ended"))
 		adc->single_ended = true;
 
-	if (!adc->single_ended &&
-	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
-		dev_err(&st->spi->dev, "Invalid chan:%d for differential adc\n",
-			sensor->chan);
-		return ERR_PTR(-EINVAL);
-	}
+	if (!adc->single_ended && sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+				      "Invalid chan:%d for differential adc\n",
+				      sensor->chan);
+
 	/* set common parameters */
 	adc->sensor.assign_chan = ltc2983_adc_assign_chan;
 	adc->sensor.fault_handler = ltc2983_common_fault_handler;
@@ -1166,21 +1145,20 @@ static struct ltc2983_sensor *ltc2983_temp_new(struct fwnode_handle *child,
 					       struct ltc2983_data *st,
 					       const struct ltc2983_sensor *sensor)
 {
+	struct device *dev = &st->spi->dev;
 	struct ltc2983_temp *temp;
 
-	temp = devm_kzalloc(&st->spi->dev, sizeof(*temp), GFP_KERNEL);
+	temp = devm_kzalloc(dev, sizeof(*temp), GFP_KERNEL);
 	if (!temp)
 		return ERR_PTR(-ENOMEM);
 
 	if (fwnode_property_read_bool(child, "adi,single-ended"))
 		temp->single_ended = true;
 
-	if (!temp->single_ended &&
-	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
-		dev_err(&st->spi->dev, "Invalid chan:%d for differential temp\n",
-			sensor->chan);
-		return ERR_PTR(-EINVAL);
-	}
+	if (!temp->single_ended && sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+				      "Invalid chan:%d for differential temp\n",
+				      sensor->chan);
 
 	temp->custom = __ltc2983_custom_sensor_new(st, child, "adi,custom-temp",
 						   false, 4096, true);
@@ -1330,10 +1308,9 @@ static int ltc2983_parse_fw(struct ltc2983_data *st)
 	device_property_read_u32(dev, "adi,filter-notch-freq", &st->filter_notch_freq);
 
 	st->num_channels = device_get_child_node_count(dev);
-	if (!st->num_channels) {
-		dev_err(&st->spi->dev, "At least one channel must be given!");
-		return -EINVAL;
-	}
+	if (!st->num_channels)
+		return dev_err_probe(dev, -EINVAL,
+				     "At least one channel must be given!");
 
 	st->sensors = devm_kcalloc(dev, st->num_channels, sizeof(*st->sensors),
 				   GFP_KERNEL);
@@ -1420,6 +1397,7 @@ static int ltc2983_eeprom_cmd(struct ltc2983_data *st, unsigned int cmd,
 			      unsigned int wait_time, unsigned int status_reg,
 			      unsigned long status_fail_mask)
 {
+	struct device *dev = &st->spi->dev;
 	unsigned long time;
 	unsigned int val;
 	int ret;
@@ -1438,19 +1416,16 @@ static int ltc2983_eeprom_cmd(struct ltc2983_data *st, unsigned int cmd,
 
 	time = wait_for_completion_timeout(&st->completion,
 					   msecs_to_jiffies(wait_time));
-	if (!time) {
-		dev_err(&st->spi->dev, "EEPROM command timed out\n");
-		return -ETIMEDOUT;
-	}
+	if (!time)
+		return dev_err_probe(dev, -ETIMEDOUT, "EEPROM command timed out\n");
 
 	ret = regmap_read(st->regmap, status_reg, &val);
 	if (ret)
 		return ret;
 
-	if (val & status_fail_mask) {
-		dev_err(&st->spi->dev, "EEPROM command failed: 0x%02X\n", val);
-		return -EINVAL;
-	}
+	if (val & status_fail_mask)
+		return dev_err_probe(dev, -EINVAL,
+				     "EEPROM command failed: 0x%02X\n", val);
 
 	return 0;
 }
@@ -1458,16 +1433,15 @@ static int ltc2983_eeprom_cmd(struct ltc2983_data *st, unsigned int cmd,
 static int ltc2983_setup(struct ltc2983_data *st, bool assign_iio)
 {
 	u32 iio_chan_t = 0, iio_chan_v = 0, chan, iio_idx = 0, status;
+	struct device *dev = &st->spi->dev;
 	int ret;
 
 	/* make sure the device is up: start bit (7) is 0 and done bit (6) is 1 */
 	ret = regmap_read_poll_timeout(st->regmap, LTC2983_STATUS_REG, status,
 				       LTC2983_STATUS_UP(status) == 1, 25000,
 				       25000 * 10);
-	if (ret) {
-		dev_err(&st->spi->dev, "Device startup timed out\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "Device startup timed out\n");
 
 	ret = regmap_update_bits(st->regmap, LTC2983_GLOBAL_CONFIG_REG,
 				 LTC2983_NOTCH_FREQ_MASK,
@@ -1567,12 +1541,13 @@ static const struct  iio_info ltc2983_iio_info = {
 
 static int ltc2983_probe(struct spi_device *spi)
 {
+	struct device *dev = &spi->dev;
 	struct ltc2983_data *st;
 	struct iio_dev *indio_dev;
 	struct gpio_desc *gpio;
 	int ret;
 
-	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 	if (!indio_dev)
 		return -ENOMEM;
 
@@ -1583,10 +1558,9 @@ static int ltc2983_probe(struct spi_device *spi)
 		return -ENODEV;
 
 	st->regmap = devm_regmap_init_spi(spi, &ltc2983_regmap_config);
-	if (IS_ERR(st->regmap)) {
-		dev_err(&spi->dev, "Failed to initialize regmap\n");
-		return PTR_ERR(st->regmap);
-	}
+	if (IS_ERR(st->regmap))
+		return dev_err_probe(dev, PTR_ERR(st->regmap),
+				     "Failed to initialize regmap\n");
 
 	mutex_init(&st->lock);
 	init_completion(&st->completion);
@@ -1602,7 +1576,7 @@ static int ltc2983_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	gpio = devm_gpiod_get_optional(&st->spi->dev, "reset", GPIOD_OUT_HIGH);
+	gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 	if (IS_ERR(gpio))
 		return PTR_ERR(gpio);
 
@@ -1612,7 +1586,7 @@ static int ltc2983_probe(struct spi_device *spi)
 		gpiod_set_value_cansleep(gpio, 0);
 	}
 
-	st->iio_chan = devm_kzalloc(&spi->dev,
+	st->iio_chan = devm_kzalloc(dev,
 				    st->iio_channels * sizeof(*st->iio_chan),
 				    GFP_KERNEL);
 	if (!st->iio_chan)
@@ -1622,12 +1596,10 @@ static int ltc2983_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	ret = devm_request_irq(&spi->dev, spi->irq, ltc2983_irq_handler,
+	ret = devm_request_irq(dev, spi->irq, ltc2983_irq_handler,
 			       IRQF_TRIGGER_RISING, st->info->name, st);
-	if (ret) {
-		dev_err(&spi->dev, "failed to request an irq, %d", ret);
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to request an irq\n");
 
 	if (st->info->has_eeprom) {
 		ret = ltc2983_eeprom_cmd(st, LTC2983_EEPROM_WRITE_CMD,
@@ -1644,7 +1616,7 @@ static int ltc2983_probe(struct spi_device *spi)
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &ltc2983_iio_info;
 
-	return devm_iio_device_register(&spi->dev, indio_dev);
+	return devm_iio_device_register(dev, indio_dev);
 }
 
 static int ltc2983_resume(struct device *dev)

-- 
2.44.0

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