--- linux-4.9.37/drivers/mtd/nand/match_table.c	1970-01-01 03:00:00.000000000 +0300
+++ linux-4.9.y/drivers/mtd/nand/match_table.c	2021-06-07 13:01:33.000000000 +0300
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) Hunan Goke,Chengdu Goke,Shandong Goke. 2021. All rights reserved.
+ */
+
+#include <linux/string.h>
+#include "match_table.h"
+
+/*****************************************************************************/
+int reg2type(struct match_reg_type *table, int length, int reg, int def)
+{
+	while (length-- > 0) {
+		if (table->reg == reg) {
+			return table->type;
+		}
+		table++;
+	}
+	return def;
+}
+
+int type2reg(struct match_reg_type *table, int length, int type, int def)
+{
+	while (length-- > 0) {
+		if (table->type == type) {
+			return table->reg;
+		}
+		table++;
+	}
+	return def;
+}
+
+int str2type(struct match_type_str *table, int length, const char *str,
+	     int size, int def)
+{
+	while (length-- > 0) {
+		if (!strncmp(table->str, str, size)) {
+			return table->type;
+		}
+		table++;
+	}
+	return def;
+}
+
+const char *type2str(struct match_type_str *table, int length, int type,
+		     const char *def)
+{
+	while (length-- > 0) {
+		if (table->type == type) {
+			return table->str;
+		}
+		table++;
+	}
+	return def;
+}
+
+int match_reg_to_type(struct match_t *table, int nr_table, int reg, int def)
+{
+	while (nr_table-- > 0) {
+		if (table->reg == reg) {
+			return table->type;
+		}
+		table++;
+	}
+	return def;
+}
+
+int match_type_to_reg(struct match_t *table, int nr_table, int type, int def)
+{
+	while (nr_table-- > 0) {
+		if (table->type == type) {
+			return table->reg;
+		}
+		table++;
+	}
+	return def;
+}
+
+int match_data_to_type(struct match_t *table, int nr_table,const char *data,
+		       int size, int def)
+{
+	while (nr_table-- > 0) {
+		if (!memcmp(table->data, data, size)) {
+			return table->type;
+		}
+		table++;
+	}
+	return def;
+}
+
+void *match_type_to_data(struct match_t *table, int nr_table, int type,
+			 const void *def)
+{
+	while (nr_table-- > 0) {
+		if (table->type == type) {
+			return table->data;
+		}
+		table++;
+	}
+	return (void *)def;
+}