include/linux/mfd/syscon.h

   1 /*
   2  * System Control Driver
   3  *
   4  * Copyright (C) 2012 Freescale Semiconductor, Inc.
   5  * Copyright (C) 2012 Linaro Ltd.
   6  *
   7  * Author: Dong Aisheng <dong.aisheng@linaro.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #ifndef __LINUX_MFD_SYSCON_H__
  16 #define __LINUX_MFD_SYSCON_H__
  17
  18 #include <linux/err.h>
  19
  20 struct device_node;
  21
  22 #ifdef CONFIG_MFD_SYSCON
  23 extern struct regmap *syscon_node_to_regmap(struct device_node *np);
  24 extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
  25 extern struct regmap *syscon_regmap_lookup_by_pdevname(const char *s);
  26 extern struct regmap *syscon_regmap_lookup_by_phandle(
  27                                         struct device_node *np,
  28                                         const char *property);
  29 #else
  30 static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
  31 {
  32         return ERR_PTR(-ENOSYS);
  33 }
  34
  35 static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
  36 {
  37         return ERR_PTR(-ENOSYS);
  38 }
  39
  40 static inline struct regmap *syscon_regmap_lookup_by_pdevname(const char *s)
  41 {
  42         return ERR_PTR(-ENOSYS);
  43 }
  44
  45 static inline struct regmap *syscon_regmap_lookup_by_phandle(
  46                                         struct device_node *np,
  47                                         const char *property)
  48 {
  49         return ERR_PTR(-ENOSYS);
  50 }
  51 #endif
  52
  53 #endif /* __LINUX_MFD_SYSCON_H__ */