blob: 7e4104b74fa8eb747a02f24a66d7e1c469941369 [file] [log] [blame]
Jon Hunter46a88532016-06-17 13:40:32 +01001/*
2 * Tegra ACONNECT Bus Driver
3 *
4 * Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11#include <linux/clk.h>
12#include <linux/module.h>
13#include <linux/of_platform.h>
14#include <linux/platform_device.h>
15#include <linux/pm_clock.h>
16#include <linux/pm_runtime.h>
17
18static int tegra_aconnect_add_clock(struct device *dev, char *name)
19{
20 struct clk *clk;
21 int ret;
22
23 clk = clk_get(dev, name);
24 if (IS_ERR(clk)) {
25 dev_err(dev, "%s clock not found\n", name);
26 return PTR_ERR(clk);
27 }
28
29 ret = pm_clk_add_clk(dev, clk);
30 if (ret)
31 clk_put(clk);
32
33 return ret;
34}
35
36static int tegra_aconnect_probe(struct platform_device *pdev)
37{
38 int ret;
39
40 if (!pdev->dev.of_node)
41 return -EINVAL;
42
43 ret = pm_clk_create(&pdev->dev);
44 if (ret)
45 return ret;
46
47 ret = tegra_aconnect_add_clock(&pdev->dev, "ape");
48 if (ret)
49 goto clk_destroy;
50
51 ret = tegra_aconnect_add_clock(&pdev->dev, "apb2ape");
52 if (ret)
53 goto clk_destroy;
54
55 pm_runtime_enable(&pdev->dev);
56
57 of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
58
59 dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
60
61 return 0;
62
63clk_destroy:
64 pm_clk_destroy(&pdev->dev);
65
66 return ret;
67}
68
69static int tegra_aconnect_remove(struct platform_device *pdev)
70{
71 pm_runtime_disable(&pdev->dev);
72
73 pm_clk_destroy(&pdev->dev);
74
75 return 0;
76}
77
78static int tegra_aconnect_runtime_resume(struct device *dev)
79{
80 return pm_clk_resume(dev);
81}
82
83static int tegra_aconnect_runtime_suspend(struct device *dev)
84{
85 return pm_clk_suspend(dev);
86}
87
88static const struct dev_pm_ops tegra_aconnect_pm_ops = {
89 SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
90 tegra_aconnect_runtime_resume, NULL)
91};
92
93static const struct of_device_id tegra_aconnect_of_match[] = {
94 { .compatible = "nvidia,tegra210-aconnect", },
95 { }
96};
97MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
98
99static struct platform_driver tegra_aconnect_driver = {
100 .probe = tegra_aconnect_probe,
101 .remove = tegra_aconnect_remove,
102 .driver = {
103 .name = "tegra-aconnect",
104 .of_match_table = tegra_aconnect_of_match,
105 .pm = &tegra_aconnect_pm_ops,
106 },
107};
108module_platform_driver(tegra_aconnect_driver);
109
110MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
111MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
112MODULE_LICENSE("GPL v2");