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_device.h>
17#include <linux/slab.h>
18#include "meson-aoclk.h"
19
20static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev,
21			       unsigned long id)
22{
23	struct meson_aoclk_reset_controller *rstc =
24		container_of(rcdev, struct meson_aoclk_reset_controller, reset);
25
26	return regmap_write(rstc->regmap, rstc->data->reset_reg,
27			    BIT(rstc->data->reset[id]));
28}
29
30static const struct reset_control_ops meson_aoclk_reset_ops = {
31	.reset = meson_aoclk_do_reset,
32};
33
34int meson_aoclkc_probe(struct platform_device *pdev)
35{
36	struct meson_aoclk_reset_controller *rstc;
37	struct meson_aoclk_data *data;
38	struct device *dev = &pdev->dev;
39	struct device_node *np;
40	struct regmap *regmap;
41	int ret, clkid;
42
43	data = (struct meson_aoclk_data *) of_device_get_match_data(dev);
44	if (!data)
45		return -ENODEV;
46
47	rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
48	if (!rstc)
49		return -ENOMEM;
50
51	np = of_get_parent(dev->of_node);
52	regmap = syscon_node_to_regmap(np);
53	of_node_put(np);
54	if (IS_ERR(regmap)) {
55		dev_err(dev, "failed to get regmap\n");
56		return PTR_ERR(regmap);
57	}
58
59	/* Reset Controller */
60	rstc->data = data;
61	rstc->regmap = regmap;
62	rstc->reset.ops = &meson_aoclk_reset_ops;
63	rstc->reset.nr_resets = data->num_reset;
64	rstc->reset.of_node = dev->of_node;
65	ret = devm_reset_controller_register(dev, &rstc->reset);
66	if (ret) {
67		dev_err(dev, "failed to register reset controller\n");
68		return ret;
69	}
70
71	/* Populate regmap */
72	for (clkid = 0; clkid < data->num_clks; clkid++)
73		data->clks[clkid]->map = regmap;
74
75	/* Register all clks */
76	for (clkid = 0; clkid < data->hw_data->num; clkid++) {
77		if (!data->hw_data->hws[clkid])
78			continue;
79
80		ret = devm_clk_hw_register(dev, data->hw_data->hws[clkid]);
81		if (ret) {
82			dev_err(dev, "Clock registration failed\n");
83			return ret;
84		}
85	}
86
87	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
88		(void *) data->hw_data);
89}
90