2 * Copyright (C) 2016 Free Electrons
4 * Maxime Ripard <maxime.ripard@free-electrons.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
12 #include <linux/clk.h>
13 #include <linux/component.h>
14 #include <linux/module.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/reset.h>
23 struct reset_control *reset;
26 static int sun6i_drc_bind(struct device *dev, struct device *master,
29 struct sun6i_drc *drc;
32 drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL);
35 dev_set_drvdata(dev, drc);
37 drc->reset = devm_reset_control_get(dev, NULL);
38 if (IS_ERR(drc->reset)) {
39 dev_err(dev, "Couldn't get our reset line\n");
40 return PTR_ERR(drc->reset);
43 ret = reset_control_deassert(drc->reset);
45 dev_err(dev, "Couldn't deassert our reset line\n");
49 drc->bus_clk = devm_clk_get(dev, "ahb");
50 if (IS_ERR(drc->bus_clk)) {
51 dev_err(dev, "Couldn't get our bus clock\n");
52 ret = PTR_ERR(drc->bus_clk);
53 goto err_assert_reset;
55 clk_prepare_enable(drc->bus_clk);
57 drc->mod_clk = devm_clk_get(dev, "mod");
58 if (IS_ERR(drc->mod_clk)) {
59 dev_err(dev, "Couldn't get our mod clock\n");
60 ret = PTR_ERR(drc->mod_clk);
61 goto err_disable_bus_clk;
63 clk_prepare_enable(drc->mod_clk);
68 clk_disable_unprepare(drc->bus_clk);
70 reset_control_assert(drc->reset);
74 static void sun6i_drc_unbind(struct device *dev, struct device *master,
77 struct sun6i_drc *drc = dev_get_drvdata(dev);
79 clk_disable_unprepare(drc->mod_clk);
80 clk_disable_unprepare(drc->bus_clk);
81 reset_control_assert(drc->reset);
84 static const struct component_ops sun6i_drc_ops = {
85 .bind = sun6i_drc_bind,
86 .unbind = sun6i_drc_unbind,
89 static int sun6i_drc_probe(struct platform_device *pdev)
91 return component_add(&pdev->dev, &sun6i_drc_ops);
94 static int sun6i_drc_remove(struct platform_device *pdev)
96 component_del(&pdev->dev, &sun6i_drc_ops);
101 static const struct of_device_id sun6i_drc_of_table[] = {
102 { .compatible = "allwinner,sun6i-a31-drc" },
103 { .compatible = "allwinner,sun6i-a31s-drc" },
104 { .compatible = "allwinner,sun8i-a33-drc" },
105 { .compatible = "allwinner,sun9i-a80-drc" },
108 MODULE_DEVICE_TABLE(of, sun6i_drc_of_table);
110 static struct platform_driver sun6i_drc_platform_driver = {
111 .probe = sun6i_drc_probe,
112 .remove = sun6i_drc_remove,
115 .of_match_table = sun6i_drc_of_table,
118 module_platform_driver(sun6i_drc_platform_driver);
120 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
121 MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver");
122 MODULE_LICENSE("GPL");