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); 65