include/linux/mfd/syscon.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * System Control Driver
   4  *
   5  * Copyright (C) 2012 Freescale Semiconductor, Inc.
   6  * Copyright (C) 2012 Linaro Ltd.
   7  *
   8  * Author: Dong Aisheng <dong.aisheng@linaro.org>
   9  */
  10
  11 #ifndef __LINUX_MFD_SYSCON_H__
  12 #define __LINUX_MFD_SYSCON_H__
  13
  14 #include <linux/err.h>
  15 #include <linux/errno.h>
  16
  17 struct device_node;
  18
  19 #ifdef CONFIG_MFD_SYSCON
  20 struct regmap *device_node_to_regmap(struct device_node *np);
  21 struct regmap *syscon_node_to_regmap(struct device_node *np);
  22 struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
  23 struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
  24                                                const char *property);
  25 struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
  26                                                     const char *property,
  27                                                     int arg_count,
  28                                                     unsigned int *out_args);
  29 struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
  30                                                         const char *property);
  31 int of_syscon_register_regmap(struct device_node *np,
  32                               struct regmap *regmap);
  33 #else
  34 static inline struct regmap *device_node_to_regmap(struct device_node *np)
  35 {
  36         return ERR_PTR(-ENOTSUPP);
  37 }
  38
  39 static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
  40 {
  41         return ERR_PTR(-ENOTSUPP);
  42 }
  43
  44 static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
  45 {
  46         return ERR_PTR(-ENOTSUPP);
  47 }
  48
  49 static inline struct regmap *syscon_regmap_lookup_by_phandle(
  50                                         struct device_node *np,
  51                                         const char *property)
  52 {
  53         return ERR_PTR(-ENOTSUPP);
  54 }
  55
  56 static inline struct regmap *syscon_regmap_lookup_by_phandle_args(
  57                                         struct device_node *np,
  58                                         const char *property,
  59                                         int arg_count,
  60                                         unsigned int *out_args)
  61 {
  62         return ERR_PTR(-ENOTSUPP);
  63 }
  64
  65 static inline struct regmap *syscon_regmap_lookup_by_phandle_optional(
  66                                         struct device_node *np,
  67                                         const char *property)
  68 {
  69         return NULL;
  70 }
  71
  72 static inline int of_syscon_register_regmap(struct device_node *np,
  73                                         struct regmap *regmap)
  74 {
  75         return -EOPNOTSUPP;
  76 }
  77
  78 #endif
  79
  80 #endif /* __LINUX_MFD_SYSCON_H__ */