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fc20ffe1 SS |
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> | |
8620d2c5 | 20 | #include <linux/of.h> |
fc20ffe1 SS |
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 | ||
8620d2c5 KH |
64 | static struct of_device_id of_keystone_table[] = { |
65 | {.compatible = "ti,keystone"}, | |
66 | { /* end of list */ }, | |
67 | }; | |
68 | ||
fc20ffe1 SS |
69 | int __init keystone_pm_runtime_init(void) |
70 | { | |
8620d2c5 KH |
71 | struct device_node *np; |
72 | ||
73 | np = of_find_matching_node(NULL, of_keystone_table); | |
74 | if (!np) | |
75 | return 0; | |
76 | ||
fc20ffe1 SS |
77 | pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier); |
78 | ||
79 | return 0; | |
80 | } |