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
23static 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
42static 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
52static 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
60static struct pm_clk_notifier_block platform_domain_notifier = {
61	.pm_domain = &keystone_pm_domain,
62};
63
64static const struct of_device_id of_keystone_table[] = {
65	{.compatible = "ti,keystone"},
66	{ /* end of list */ },
67};
68
69int __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