i2c: mux: pca954x: use helper variable in probe

This creates a struct device *dev helper variable in probe()
which IMO makes the code less cluttered and easier to read.
Also rename the of_node veriable to the common shortform "np"
(node pointer).
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
[peda: slightly edited commit message and removed some surplus newlines]
Signed-off-by: Peter Rosin <peda@axentia.se>

drivers/i2c/muxes/i2c-mux-pca954x.c

@@ -368,7 +368,8 @@ static int pca954x_probe(struct i2c_client *client,
 {
 	struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
 	struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
-	struct device_node *of_node = client->dev.of_node;
+	struct device *dev = &client->dev;
+	struct device_node *np = dev->of_node;
 	bool idle_disconnect_dt;
 	struct gpio_desc *gpio;
 	int num, force, class;
@@ -379,8 +380,7 @@ static int pca954x_probe(struct i2c_client *client,
 	if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE))
 		return -ENODEV;
 
-	muxc = i2c_mux_alloc(adap, &client->dev,
-			     PCA954X_MAX_NCHANS, sizeof(*data), 0,
+	muxc = i2c_mux_alloc(adap, dev, PCA954X_MAX_NCHANS, sizeof(*data), 0,
 			     pca954x_select_chan, pca954x_deselect_mux);
 	if (!muxc)
 		return -ENOMEM;
@@ -390,7 +390,7 @@ static int pca954x_probe(struct i2c_client *client,
 	data->client = client;
 
 	/* Reset the mux if a reset GPIO is specified. */
-	gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+	gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 	if (IS_ERR(gpio))
 		return PTR_ERR(gpio);
 	if (gpio) {
@@ -400,7 +400,7 @@ static int pca954x_probe(struct i2c_client *client,
 		udelay(1);
 	}
 
-	data->chip = of_device_get_match_data(&client->dev);
+	data->chip = of_device_get_match_data(dev);
 	if (!data->chip)
 		data->chip = &chips[id->driver_data];
 
@@ -414,8 +414,7 @@ static int pca954x_probe(struct i2c_client *client,
 		if (!ret &&
 		    (id.manufacturer_id != data->chip->id.manufacturer_id ||
 		     id.part_id != data->chip->id.part_id)) {
-			dev_warn(&client->dev,
-				 "unexpected device id %03x-%03x-%x\n",
+			dev_warn(dev, "unexpected device id %03x-%03x-%x\n",
 				 id.manufacturer_id, id.part_id,
 				 id.die_revision);
 			return -ENODEV;
@@ -427,14 +426,14 @@ static int pca954x_probe(struct i2c_client *client,
 	 * initializes the mux to disconnected state.
 	 */
 	if (i2c_smbus_write_byte(client, 0) < 0) {
-		dev_warn(&client->dev, "probe failed\n");
+		dev_warn(dev, "probe failed\n");
 		return -ENODEV;
 	}
 
 	data->last_chan = 0;		   /* force the first selection */
 
-	idle_disconnect_dt = of_node &&
-		of_property_read_bool(of_node, "i2c-mux-idle-disconnect");
+	idle_disconnect_dt = np &&
+		of_property_read_bool(np, "i2c-mux-idle-disconnect");
 
 	ret = pca954x_irq_setup(muxc);
 	if (ret)
@@ -465,7 +464,7 @@ static int pca954x_probe(struct i2c_client *client,
 	}
 
 	if (data->irq) {
-		ret = devm_request_threaded_irq(&client->dev, data->client->irq,
+		ret = devm_request_threaded_irq(dev, data->client->irq,
 						NULL, pca954x_irq_handler,
 						IRQF_ONESHOT | IRQF_SHARED,
 						"pca954x", data);
@@ -473,8 +472,7 @@ static int pca954x_probe(struct i2c_client *client,
 			goto fail_cleanup;
 	}
 
-	dev_info(&client->dev,
-		 "registered %d multiplexed busses for I2C %s %s\n",
+	dev_info(dev, "registered %d multiplexed busses for I2C %s %s\n",
 		 num, data->chip->muxtype == pca954x_ismux
 				? "mux" : "switch", client->name);