1 files changed, 64 insertions, 10 deletions
diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
index b473577f36db..aad9c6b50463 100644
--- a/include/linux/mfd/syscon.h
+++ b/include/linux/mfd/syscon.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * System Control Driver
  *
@@ -5,22 +6,75 @@
  * Copyright (C) 2012 Linaro Ltd.
  *
  * Author: Dong Aisheng <dong.aisheng@linaro.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifndef __LINUX_MFD_SYSCON_H__
 #define __LINUX_MFD_SYSCON_H__
 
+#include <linux/err.h>
+#include <linux/errno.h>
+
 struct device_node;
 
-extern struct regmap *syscon_node_to_regmap(struct device_node *np);
-extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
-extern struct regmap *syscon_regmap_lookup_by_pdevname(const char *s);
-extern struct regmap *syscon_regmap_lookup_by_phandle(
+#ifdef CONFIG_MFD_SYSCON
+struct regmap *device_node_to_regmap(struct device_node *np);
+struct regmap *syscon_node_to_regmap(struct device_node *np);
+struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
+struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
+					       const char *property);
+struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
+						    const char *property,
+						    int arg_count,
+						    unsigned int *out_args);
+struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
+							const char *property);
+int of_syscon_register_regmap(struct device_node *np,
+			      struct regmap *regmap);
+#else
+static inline struct regmap *device_node_to_regmap(struct device_node *np)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline struct regmap *syscon_regmap_lookup_by_phandle(
+					struct device_node *np,
+					const char *property)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline struct regmap *syscon_regmap_lookup_by_phandle_args(
+					struct device_node *np,
+					const char *property,
+					int arg_count,
+					unsigned int *out_args)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline struct regmap *syscon_regmap_lookup_by_phandle_optional(
 					struct device_node *np,
-					const char *property);
+					const char *property)
+{
+	return NULL;
+}
+
+static inline int of_syscon_register_regmap(struct device_node *np,
+					struct regmap *regmap)
+{
+	return -EOPNOTSUPP;
+}
+
+#endif
+
 #endif /* __LINUX_MFD_SYSCON_H__ */