This source file includes following definitions.
- sun6i_drc_bind
- sun6i_drc_unbind
- sun6i_drc_probe
- sun6i_drc_remove
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8 #include <linux/clk.h>
9 #include <linux/component.h>
10 #include <linux/module.h>
11 #include <linux/mod_devicetable.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 #include <linux/reset.h>
15
16 struct sun6i_drc {
17 struct clk *bus_clk;
18 struct clk *mod_clk;
19 struct reset_control *reset;
20 };
21
22 static int sun6i_drc_bind(struct device *dev, struct device *master,
23 void *data)
24 {
25 struct sun6i_drc *drc;
26 int ret;
27
28 drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL);
29 if (!drc)
30 return -ENOMEM;
31 dev_set_drvdata(dev, drc);
32
33 drc->reset = devm_reset_control_get(dev, NULL);
34 if (IS_ERR(drc->reset)) {
35 dev_err(dev, "Couldn't get our reset line\n");
36 return PTR_ERR(drc->reset);
37 }
38
39 ret = reset_control_deassert(drc->reset);
40 if (ret) {
41 dev_err(dev, "Couldn't deassert our reset line\n");
42 return ret;
43 }
44
45 drc->bus_clk = devm_clk_get(dev, "ahb");
46 if (IS_ERR(drc->bus_clk)) {
47 dev_err(dev, "Couldn't get our bus clock\n");
48 ret = PTR_ERR(drc->bus_clk);
49 goto err_assert_reset;
50 }
51 clk_prepare_enable(drc->bus_clk);
52
53 drc->mod_clk = devm_clk_get(dev, "mod");
54 if (IS_ERR(drc->mod_clk)) {
55 dev_err(dev, "Couldn't get our mod clock\n");
56 ret = PTR_ERR(drc->mod_clk);
57 goto err_disable_bus_clk;
58 }
59 clk_prepare_enable(drc->mod_clk);
60
61 return 0;
62
63 err_disable_bus_clk:
64 clk_disable_unprepare(drc->bus_clk);
65 err_assert_reset:
66 reset_control_assert(drc->reset);
67 return ret;
68 }
69
70 static void sun6i_drc_unbind(struct device *dev, struct device *master,
71 void *data)
72 {
73 struct sun6i_drc *drc = dev_get_drvdata(dev);
74
75 clk_disable_unprepare(drc->mod_clk);
76 clk_disable_unprepare(drc->bus_clk);
77 reset_control_assert(drc->reset);
78 }
79
80 static const struct component_ops sun6i_drc_ops = {
81 .bind = sun6i_drc_bind,
82 .unbind = sun6i_drc_unbind,
83 };
84
85 static int sun6i_drc_probe(struct platform_device *pdev)
86 {
87 return component_add(&pdev->dev, &sun6i_drc_ops);
88 }
89
90 static int sun6i_drc_remove(struct platform_device *pdev)
91 {
92 component_del(&pdev->dev, &sun6i_drc_ops);
93
94 return 0;
95 }
96
97 static const struct of_device_id sun6i_drc_of_table[] = {
98 { .compatible = "allwinner,sun6i-a31-drc" },
99 { .compatible = "allwinner,sun6i-a31s-drc" },
100 { .compatible = "allwinner,sun8i-a23-drc" },
101 { .compatible = "allwinner,sun8i-a33-drc" },
102 { .compatible = "allwinner,sun9i-a80-drc" },
103 { }
104 };
105 MODULE_DEVICE_TABLE(of, sun6i_drc_of_table);
106
107 static struct platform_driver sun6i_drc_platform_driver = {
108 .probe = sun6i_drc_probe,
109 .remove = sun6i_drc_remove,
110 .driver = {
111 .name = "sun6i-drc",
112 .of_match_table = sun6i_drc_of_table,
113 },
114 };
115 module_platform_driver(sun6i_drc_platform_driver);
116
117 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
118 MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver");
119 MODULE_LICENSE("GPL");