arch/arm/mach-keystone/pm_domain.c

   1 /*
   2  * PM domain driver for Keystone2 devices
   3  *
   4  * Copyright 2013 Texas Instruments, Inc.
   5  *      Santosh Shilimkar <santosh.shillimkar@ti.com>
   6  *
   7  * Based on Kevins work on DAVINCI SOCs
   8  *      Kevin Hilman <khilman@linaro.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms and conditions of the GNU General Public License,
  12  * version 2, as published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/pm_clock.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/clk-provider.h>
  20 #include <linux/of.h>
  21
  22 #ifdef CONFIG_PM_RUNTIME
  23 static int keystone_pm_runtime_suspend(struct device *dev)
  24 {
  25         int ret;
  26
  27         dev_dbg(dev, "%s\n", __func__);
  28
  29         ret = pm_generic_runtime_suspend(dev);
  30         if (ret)
  31                 return ret;
  32
  33         ret = pm_clk_suspend(dev);
  34         if (ret) {
  35                 pm_generic_runtime_resume(dev);
  36                 return ret;
  37         }
  38
  39         return 0;
  40 }
  41
  42 static int keystone_pm_runtime_resume(struct device *dev)
  43 {
  44         dev_dbg(dev, "%s\n", __func__);
  45
  46         pm_clk_resume(dev);
  47
  48         return pm_generic_runtime_resume(dev);
  49 }
  50 #endif
  51
  52 static struct dev_pm_domain keystone_pm_domain = {
  53         .ops = {
  54                 SET_RUNTIME_PM_OPS(keystone_pm_runtime_suspend,
  55                                    keystone_pm_runtime_resume, NULL)
  56                 USE_PLATFORM_PM_SLEEP_OPS
  57         },
  58 };
  59
  60 static struct pm_clk_notifier_block platform_domain_notifier = {
  61         .pm_domain = &keystone_pm_domain,
  62 };
  63
  64 static struct of_device_id of_keystone_table[] = {
  65         {.compatible = "ti,keystone"},
  66         { /* end of list */ },
  67 };
  68
  69 int __init keystone_pm_runtime_init(void)
  70 {
  71         struct device_node *np;
  72
  73         np = of_find_matching_node(NULL, of_keystone_table);
  74         if (!np)
  75                 return 0;
  76
  77         of_clk_init(NULL);
  78         pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);
  79
  80         return 0;
  81 }
  82 subsys_initcall(keystone_pm_runtime_init);