soc: imx8: Use existing of_root directly

There is common of_root for reference, no need to find it
from DT again, use of_root directly to make driver simple.

Signed-off-by: Anson Huang <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

Author: Anson-Huang

drivers/soc/imx/soc-imx8.c

@@ -94,7 +94,6 @@ static int __init imx8_soc_init(void)
 {
 	struct soc_device_attribute *soc_dev_attr;
 	struct soc_device *soc_dev;
-	struct device_node *root;
 	const struct of_device_id *id;
 	u32 soc_rev = 0;
 	const struct imx8_soc_data *data;
@@ -106,12 +105,11 @@ static int __init imx8_soc_init(void)
 
 	soc_dev_attr->family = "Freescale i.MX";
 
-	root = of_find_node_by_path("/");
-	ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
+	ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine);
 	if (ret)
 		goto free_soc;
 
-	id = of_match_node(imx8_soc_match, root);
+	id = of_match_node(imx8_soc_match, of_root);
 	if (!id) {
 		ret = -ENODEV;
 		goto free_soc;
@@ -136,16 +134,13 @@ static int __init imx8_soc_init(void)
 		goto free_rev;
 	}
 
-	of_node_put(root);
-
 	return 0;
 
 free_rev:
 	if (strcmp(soc_dev_attr->revision, "unknown"))
 		kfree(soc_dev_attr->revision);
 free_soc:
 	kfree(soc_dev_attr);
-	of_node_put(root);
 	return ret;
 }
 device_initcall(imx8_soc_init);