of: Reimplement of_machine_is_compatible() using of_machine_compatible_match()

of_machine_compatible_match() works with a table of strings.
of_machine_is_compatible() is a simplier version with only one string.

Re-implement of_machine_is_compatible() by setting a table of strings
with a single string then using of_machine_compatible_match().
Suggested-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231214103152.12269-3-mpe@ellerman.id.au

drivers/of/base.c

@@ -414,26 +414,7 @@ bool of_machine_compatible_match(const char *const *compats)
 
 	return rc != 0;
 }
-
-/**
- * of_machine_is_compatible - Test root of device tree for a given compatible value
- * @compat: compatible string to look for in root node's compatible property.
- *
- * Return: true if the root node has the given value in its compatible property.
- */
-bool of_machine_is_compatible(const char *compat)
-{
-	struct device_node *root;
-	int rc = 0;
-
-	root = of_find_node_by_path("/");
-	if (root) {
-		rc = of_device_is_compatible(root, compat);
-		of_node_put(root);
-	}
-	return rc;
-}
-EXPORT_SYMBOL(of_machine_is_compatible);
+EXPORT_SYMBOL(of_machine_compatible_match);
 
 /**
  *  __of_device_is_available - check if a device is available for use

include/linux/of.h

@@ -402,9 +402,21 @@ extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
 extern int of_alias_get_id(struct device_node *np, const char *stem);
 extern int of_alias_get_highest_id(const char *stem);
 
-extern bool of_machine_is_compatible(const char *compat);
 bool of_machine_compatible_match(const char *const *compats);
 
+/**
+ * of_machine_is_compatible - Test root of device tree for a given compatible value
+ * @compat: compatible string to look for in root node's compatible property.
+ *
+ * Return: true if the root node has the given value in its compatible property.
+ */
+static inline bool of_machine_is_compatible(const char *compat)
+{
+	const char *compats[] = { compat, NULL };
+
+	return of_machine_compatible_match(compats);
+}
+
 extern int of_add_property(struct device_node *np, struct property *prop);
 extern int of_remove_property(struct device_node *np, struct property *prop);
 extern int of_update_property(struct device_node *np, struct property *newprop);