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
keystone_pm_runtime_suspend(struct device * dev)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
keystone_pm_runtime_resume(struct device * dev)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 const struct of_device_id of_keystone_table[] = {
65 {.compatible = "ti,keystone"},
66 { /* end of list */ },
67 };
68
keystone_pm_runtime_init(void)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 pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);
78
79 return 0;
80 }
81