include/linux/pm_clock.h

   1 /*
   2  * pm_clock.h - Definitions and headers related to device clocks.
   3  *
   4  * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
   5  *
   6  * This file is released under the GPLv2.
   7  */
   8
   9 #ifndef _LINUX_PM_CLOCK_H
  10 #define _LINUX_PM_CLOCK_H
  11
  12 #include <linux/device.h>
  13 #include <linux/notifier.h>
  14
  15 struct pm_clk_notifier_block {
  16         struct notifier_block nb;
  17         struct dev_pm_domain *pm_domain;
  18         char *con_ids[];
  19 };
  20
  21 #ifdef CONFIG_PM_CLK
  22 static inline bool pm_clk_no_clocks(struct device *dev)
  23 {
  24         return dev && dev->power.subsys_data
  25                 && list_empty(&dev->power.subsys_data->clock_list);
  26 }
  27
  28 extern void pm_clk_init(struct device *dev);
  29 extern int pm_clk_create(struct device *dev);
  30 extern void pm_clk_destroy(struct device *dev);
  31 extern int pm_clk_add(struct device *dev, const char *con_id);
  32 extern void pm_clk_remove(struct device *dev, const char *con_id);
  33 extern int pm_clk_suspend(struct device *dev);
  34 extern int pm_clk_resume(struct device *dev);
  35 #else
  36 static inline bool pm_clk_no_clocks(struct device *dev)
  37 {
  38         return true;
  39 }
  40 static inline void pm_clk_init(struct device *dev)
  41 {
  42 }
  43 static inline int pm_clk_create(struct device *dev)
  44 {
  45         return -EINVAL;
  46 }
  47 static inline void pm_clk_destroy(struct device *dev)
  48 {
  49 }
  50 static inline int pm_clk_add(struct device *dev, const char *con_id)
  51 {
  52         return -EINVAL;
  53 }
  54 static inline void pm_clk_remove(struct device *dev, const char *con_id)
  55 {
  56 }
  57 #define pm_clk_suspend  NULL
  58 #define pm_clk_resume   NULL
  59 #endif
  60
  61 #ifdef CONFIG_HAVE_CLK
  62 extern void pm_clk_add_notifier(struct bus_type *bus,
  63                                         struct pm_clk_notifier_block *clknb);
  64 #else
  65 static inline void pm_clk_add_notifier(struct bus_type *bus,
  66                                         struct pm_clk_notifier_block *clknb)
  67 {
  68 }
  69 #endif
  70
  71 #endif