1 files changed, 75 insertions, 0 deletions
diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
new file mode 100644
index 000000000..fecc2fa2a
--- /dev/null
+++ b/include/linux/mfd/syscon.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * System Control Driver
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ * Copyright (C) 2012 Linaro Ltd.
+ *
+ * Author: Dong Aisheng <dong.aisheng@linaro.org>
+ */
+
+#ifndef __LINUX_MFD_SYSCON_H__
+#define __LINUX_MFD_SYSCON_H__
+
+#include <linux/err.h>
+#include <linux/errno.h>
+
+struct device_node;
+
+#ifdef CONFIG_MFD_SYSCON
+extern struct regmap *device_node_to_regmap(struct device_node *np);
+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_phandle(
+					struct device_node *np,
+					const char *property);
+extern struct regmap *syscon_regmap_lookup_by_phandle_args(
+					struct device_node *np,
+					const char *property,
+					int arg_count,
+					unsigned int *out_args);
+extern struct regmap *syscon_regmap_lookup_by_phandle_optional(
+					struct device_node *np,
+					const char *property);
+#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)
+{
+	return NULL;
+}
+
+#endif
+
+#endif /* __LINUX_MFD_SYSCON_H__ */