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 extern struct regmap *device_node_to_regmap(struct device_node *np);
  21 extern struct regmap *syscon_node_to_regmap(struct device_node *np);
  22 extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
  23 extern struct regmap *syscon_regmap_lookup_by_phandle(
  24                                         struct device_node *np,
  25                                         const char *property);
  26 extern struct regmap *syscon_regmap_lookup_by_phandle_args(
  27                                         struct device_node *np,
  28                                         const char *property,
  29                                         int arg_count,
  30                                         unsigned int *out_args);
  31 extern struct regmap *syscon_regmap_lookup_by_phandle_optional(
  32                                         struct device_node *np,
  33                                         const char *property);
  34 #else
  35 static inline struct regmap *device_node_to_regmap(struct device_node *np)
  36 {
  37         return ERR_PTR(-ENOTSUPP);
  38 }
  39
  40 static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
  41 {
  42         return ERR_PTR(-ENOTSUPP);
  43 }
  44
  45 static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
  46 {
  47         return ERR_PTR(-ENOTSUPP);
  48 }
  49
  50 static inline struct regmap *syscon_regmap_lookup_by_phandle(
  51                                         struct device_node *np,
  52                                         const char *property)
  53 {
  54         return ERR_PTR(-ENOTSUPP);
  55 }
  56
  57 static inline struct regmap *syscon_regmap_lookup_by_phandle_args(
  58                                         struct device_node *np,
  59                                         const char *property,
  60                                         int arg_count,
  61                                         unsigned int *out_args)
  62 {
  63         return ERR_PTR(-ENOTSUPP);
  64 }
  65
  66 static inline struct regmap *syscon_regmap_lookup_by_phandle_optional(
  67                                         struct device_node *np,
  68                                         const char *property)
  69 {
  70         return NULL;
  71 }
  72
  73 #endif
  74
  75 #endif /* __LINUX_MFD_SYSCON_H__ */