1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2016 Free Electrons
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
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>
19 struct reset_control *reset;
22 static int sun6i_drc_bind(struct device *dev, struct device *master,
25 struct sun6i_drc *drc;
28 drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL);
31 dev_set_drvdata(dev, drc);
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);
39 ret = reset_control_deassert(drc->reset);
41 dev_err(dev, "Couldn't deassert our reset line\n");
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;
51 clk_prepare_enable(drc->bus_clk);
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;
59 clk_prepare_enable(drc->mod_clk);
64 clk_disable_unprepare(drc->bus_clk);
66 reset_control_assert(drc->reset);
70 static void sun6i_drc_unbind(struct device *dev, struct device *master,
73 struct sun6i_drc *drc = dev_get_drvdata(dev);
75 clk_disable_unprepare(drc->mod_clk);
76 clk_disable_unprepare(drc->bus_clk);
77 reset_control_assert(drc->reset);
80 static const struct component_ops sun6i_drc_ops = {
81 .bind = sun6i_drc_bind,
82 .unbind = sun6i_drc_unbind,
85 static int sun6i_drc_probe(struct platform_device *pdev)
87 return component_add(&pdev->dev, &sun6i_drc_ops);
90 static int sun6i_drc_remove(struct platform_device *pdev)
92 component_del(&pdev->dev, &sun6i_drc_ops);
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" },
105 MODULE_DEVICE_TABLE(of, sun6i_drc_of_table);
107 static struct platform_driver sun6i_drc_platform_driver = {
108 .probe = sun6i_drc_probe,
109 .remove = sun6i_drc_remove,
112 .of_match_table = sun6i_drc_of_table,
115 module_platform_driver(sun6i_drc_platform_driver);
117 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
118 MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver");
119 MODULE_LICENSE("GPL");