backlight: lp855x: Add dev helper variable to lp855x_probe()

Add a dev local variable to the lp855x_probe(), to replace "&cl->dev"
and "lp->dev" in various places.

Also switch to dev_err_probe() in one case which takes care of not
printing -EPROBE_DEFER errors for us.

This is mostly a preparation for adding ACPI enumeration support which
will use the new "dev" variable more.

Signed-off-by: Hans de Goede <[e-mail]>
Reviewed-by: Daniel Thompson <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/video/backlight/lp855x_bl.c

···
 
 static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 {
+	struct device *dev = &cl->dev;
 	struct lp855x *lp;
 	int ret;
 
 	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
 		return -EIO;
 
-	lp = devm_kzalloc(&cl->dev, sizeof(struct lp855x), GFP_KERNEL);
+	lp = devm_kzalloc(dev, sizeof(struct lp855x), GFP_KERNEL);
 	if (!lp)
 		return -ENOMEM;
 
 	lp->client = cl;
-	lp->dev = &cl->dev;
+	lp->dev = dev;
 	lp->chipname = id->name;
 	lp->chip_id = id->driver_data;
-	lp->pdata = dev_get_platdata(&cl->dev);
+	lp->pdata = dev_get_platdata(dev);
 
 	switch (lp->chip_id) {
 	case LP8550:
···
 	else
 		lp->mode = REGISTER_BASED;
 
-	lp->supply = devm_regulator_get(lp->dev, "power");
+	lp->supply = devm_regulator_get(dev, "power");
 	if (IS_ERR(lp->supply)) {
 		if (PTR_ERR(lp->supply) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;
 		lp->supply = NULL;
 	}
 
-	lp->enable = devm_regulator_get_optional(lp->dev, "enable");
+	lp->enable = devm_regulator_get_optional(dev, "enable");
 	if (IS_ERR(lp->enable)) {
 		ret = PTR_ERR(lp->enable);
 		if (ret == -ENODEV) {
 			lp->enable = NULL;
 		} else {
-			if (ret != -EPROBE_DEFER)
-				dev_err(lp->dev, "error getting enable regulator: %d\n",
-					ret);
-			return ret;
+			return dev_err_probe(dev, ret, "getting enable regulator\n");
 		}
 	}
 
 	if (lp->supply) {
 		ret = regulator_enable(lp->supply);
 		if (ret < 0) {
-			dev_err(&cl->dev, "failed to enable supply: %d\n", ret);
+			dev_err(dev, "failed to enable supply: %d\n", ret);
 			return ret;
 		}
 	}
···
 	if (lp->enable) {
 		ret = regulator_enable(lp->enable);
 		if (ret < 0) {
-			dev_err(lp->dev, "failed to enable vddio: %d\n", ret);
+			dev_err(dev, "failed to enable vddio: %d\n", ret);
 			goto disable_supply;
 		}
 
···
 
 	ret = lp855x_configure(lp);
 	if (ret) {
-		dev_err(lp->dev, "device config err: %d", ret);
+		dev_err(dev, "device config err: %d", ret);
 		goto disable_vddio;
 	}
 
 	ret = lp855x_backlight_register(lp);
 	if (ret) {
-		dev_err(lp->dev,
-			"failed to register backlight. err: %d\n", ret);
+		dev_err(dev, "failed to register backlight. err: %d\n", ret);
 		goto disable_vddio;
 	}
 
-	ret = sysfs_create_group(&lp->dev->kobj, &lp855x_attr_group);
+	ret = sysfs_create_group(&dev->kobj, &lp855x_attr_group);
 	if (ret) {
-		dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret);
+		dev_err(dev, "failed to register sysfs. err: %d\n", ret);
 		goto disable_vddio;
 	}