1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Amlogic Meson-AXG Clock Controller Driver |
4 | * |
5 | * Copyright (c) 2016 BayLibre, SAS. |
6 | * Author: Neil Armstrong <narmstrong@baylibre.com> |
7 | * |
8 | * Copyright (c) 2018 Amlogic, inc. |
9 | * Author: Qiufang Dai <qiufang.dai@amlogic.com> |
10 | * Author: Yixun Lan <yixun.lan@amlogic.com> |
11 | */ |
12 | |
13 | #include <linux/platform_device.h> |
14 | #include <linux/reset-controller.h> |
15 | #include <linux/mfd/syscon.h> |
16 | #include <linux/of.h> |
17 | #include <linux/module.h> |
18 | |
19 | #include <linux/slab.h> |
20 | #include "meson-aoclk.h" |
21 | |
22 | static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev, |
23 | unsigned long id) |
24 | { |
25 | struct meson_aoclk_reset_controller *rstc = |
26 | container_of(rcdev, struct meson_aoclk_reset_controller, reset); |
27 | |
28 | return regmap_write(map: rstc->regmap, reg: rstc->data->reset_reg, |
29 | BIT(rstc->data->reset[id])); |
30 | } |
31 | |
32 | static const struct reset_control_ops meson_aoclk_reset_ops = { |
33 | .reset = meson_aoclk_do_reset, |
34 | }; |
35 | |
36 | int meson_aoclkc_probe(struct platform_device *pdev) |
37 | { |
38 | struct meson_aoclk_reset_controller *rstc; |
39 | struct meson_aoclk_data *data; |
40 | struct device *dev = &pdev->dev; |
41 | struct device_node *np; |
42 | struct regmap *regmap; |
43 | int ret, clkid; |
44 | |
45 | data = (struct meson_aoclk_data *) of_device_get_match_data(dev); |
46 | if (!data) |
47 | return -ENODEV; |
48 | |
49 | rstc = devm_kzalloc(dev, size: sizeof(*rstc), GFP_KERNEL); |
50 | if (!rstc) |
51 | return -ENOMEM; |
52 | |
53 | np = of_get_parent(node: dev->of_node); |
54 | regmap = syscon_node_to_regmap(np); |
55 | of_node_put(node: np); |
56 | if (IS_ERR(ptr: regmap)) { |
57 | dev_err(dev, "failed to get regmap\n" ); |
58 | return PTR_ERR(ptr: regmap); |
59 | } |
60 | |
61 | /* Reset Controller */ |
62 | rstc->data = data; |
63 | rstc->regmap = regmap; |
64 | rstc->reset.ops = &meson_aoclk_reset_ops; |
65 | rstc->reset.nr_resets = data->num_reset; |
66 | rstc->reset.of_node = dev->of_node; |
67 | ret = devm_reset_controller_register(dev, rcdev: &rstc->reset); |
68 | if (ret) { |
69 | dev_err(dev, "failed to register reset controller\n" ); |
70 | return ret; |
71 | } |
72 | |
73 | /* Populate regmap */ |
74 | for (clkid = 0; clkid < data->num_clks; clkid++) |
75 | data->clks[clkid]->map = regmap; |
76 | |
77 | /* Register all clks */ |
78 | for (clkid = 0; clkid < data->hw_clks.num; clkid++) { |
79 | if (!data->hw_clks.hws[clkid]) |
80 | continue; |
81 | |
82 | ret = devm_clk_hw_register(dev, hw: data->hw_clks.hws[clkid]); |
83 | if (ret) { |
84 | dev_err(dev, "Clock registration failed\n" ); |
85 | return ret; |
86 | } |
87 | } |
88 | |
89 | return devm_of_clk_add_hw_provider(dev, get: meson_clk_hw_get, data: (void *)&data->hw_clks); |
90 | } |
91 | EXPORT_SYMBOL_GPL(meson_aoclkc_probe); |
92 | MODULE_LICENSE("GPL v2" ); |
93 | |