--- zzzz-none-000/linux-4.4.271/drivers/of/of_reserved_mem.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/of/of_reserved_mem.c	2023-04-19 10:22:29.000000000 +0000
@@ -22,7 +22,7 @@
 #include <linux/of_reserved_mem.h>
 #include <linux/sort.h>
 
-#define MAX_RESERVED_REGIONS	16
+#define MAX_RESERVED_REGIONS	32
 static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
 static int reserved_mem_count;
 
@@ -289,6 +289,15 @@
 	}
 }
 
+struct reserved_mem *fdt_get_reserved_mem_resource(const char* name) {
+	int i;
+	pr_info("[%s] mem_count = %d; search name = \"%s\"\n", __func__, reserved_mem_count, name);
+	for (i = 0; i < reserved_mem_count; i++)
+		if (!strncmp(reserved_mem[i].name, name, strlen(name))) return &reserved_mem[i];
+	return NULL;
+}
+
+
 static inline struct reserved_mem *__find_rmem(struct device_node *node)
 {
 	unsigned int i;
@@ -356,3 +365,29 @@
 	rmem->ops->device_release(rmem, dev);
 }
 EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
+
+/**
+ * of_reserved_mem_lookup() - acquire reserved_mem from a device node
+ * @np:		node pointer of the desired reserved-memory region
+ *
+ * This function allows drivers to acquire a reference to the reserved_mem
+ * struct based on a device node handle.
+ *
+ * Returns a reserved_mem reference, or NULL on error.
+ */
+struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
+{
+	const char *name;
+	int i;
+
+	if (!np->full_name)
+		return NULL;
+
+	name = kbasename(np->full_name);
+	for (i = 0; i < reserved_mem_count; i++)
+		if (!strcmp(reserved_mem[i].name, name))
+			return &reserved_mem[i];
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(of_reserved_mem_lookup);