arch/arm/mach-davinci/pm_domain.c

   1 /*
   2  * Runtime PM support code for DaVinci
   3  *
   4  * Author: Kevin Hilman
   5  *
   6  * Copyright (C) 2012 Texas Instruments, Inc.
   7  *
   8  * This file is licensed under the terms of the GNU General Public
   9  * License version 2. This program is licensed "as is" without any
  10  * warranty of any kind, whether express or implied.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/pm_clock.h>
  15 #include <linux/platform_device.h>
  16
  17 #ifdef CONFIG_PM_RUNTIME
  18 static int davinci_pm_runtime_suspend(struct device *dev)
  19 {
  20         int ret;
  21
  22         dev_dbg(dev, "%s\n", __func__);
  23
  24         ret = pm_generic_runtime_suspend(dev);
  25         if (ret)
  26                 return ret;
  27
  28         ret = pm_clk_suspend(dev);
  29         if (ret) {
  30                 pm_generic_runtime_resume(dev);
  31                 return ret;
  32         }
  33
  34         return 0;
  35 }
  36
  37 static int davinci_pm_runtime_resume(struct device *dev)
  38 {
  39         dev_dbg(dev, "%s\n", __func__);
  40
  41         pm_clk_resume(dev);
  42         return pm_generic_runtime_resume(dev);
  43 }
  44 #endif
  45
  46 static struct dev_pm_domain davinci_pm_domain = {
  47         .ops = {
  48                 SET_RUNTIME_PM_OPS(davinci_pm_runtime_suspend,
  49                                    davinci_pm_runtime_resume, NULL)
  50                 USE_PLATFORM_PM_SLEEP_OPS
  51         },
  52 };
  53
  54 static struct pm_clk_notifier_block platform_bus_notifier = {
  55         .pm_domain = &davinci_pm_domain,
  56 };
  57
  58 static int __init davinci_pm_runtime_init(void)
  59 {
  60         pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
  61
  62         return 0;
  63 }
  64 core_initcall(davinci_pm_runtime_init);