summaryrefslogtreecommitdiffstats
path: root/drivers/clk/clk-rk808.c
blob: b1d7e4a296ef635ddbe4245265b720cc60832552 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Clkout driver for Rockchip RK808
 *
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author:Chris Zhong <zyw@rock-chips.com>
 */

#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mfd/rk808.h>
#include <linux/i2c.h>

struct rk808_clkout {
	struct rk808 *rk808;
	struct clk_hw		clkout1_hw;
	struct clk_hw		clkout2_hw;
};

static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
					      unsigned long parent_rate)
{
	return 32768;
}

static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);
	struct rk808 *rk808 = rk808_clkout->rk808;

	return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
				  CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
}

static int rk808_clkout2_prepare(struct clk_hw *hw)
{
	return rk808_clkout2_enable(hw, true);
}

static void rk808_clkout2_unprepare(struct clk_hw *hw)
{
	rk808_clkout2_enable(hw, false);
}

static int rk808_clkout2_is_prepared(struct clk_hw *hw)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);
	struct rk808 *rk808 = rk808_clkout->rk808;
	uint32_t val;

	int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);

	if (ret < 0)
		return ret;

	return (val & CLK32KOUT2_EN) ? 1 : 0;
}

static const struct clk_ops rk808_clkout1_ops = {
	.recalc_rate = rk808_clkout_recalc_rate,
};

static const struct clk_ops rk808_clkout2_ops = {
	.prepare = rk808_clkout2_prepare,
	.unprepare = rk808_clkout2_unprepare,
	.is_prepared = rk808_clkout2_is_prepared,
	.recalc_rate = rk808_clkout_recalc_rate,
};

static struct clk_hw *
of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
{
	struct rk808_clkout *rk808_clkout = data;
	unsigned int idx = clkspec->args[0];

	if (idx >= 2) {
		pr_err("%s: invalid index %u\n", __func__, idx);
		return ERR_PTR(-EINVAL);
	}

	return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
}

static int rk808_clkout_probe(struct platform_device *pdev)
{
	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	struct i2c_client *client = rk808->i2c;
	struct device_node *node = client->dev.of_node;
	struct clk_init_data init = {};
	struct rk808_clkout *rk808_clkout;
	int ret;

	rk808_clkout = devm_kzalloc(&client->dev,
				    sizeof(*rk808_clkout), GFP_KERNEL);
	if (!rk808_clkout)
		return -ENOMEM;

	rk808_clkout->rk808 = rk808;

	init.parent_names = NULL;
	init.num_parents = 0;
	init.name = "rk808-clkout1";
	init.ops = &rk808_clkout1_ops;
	rk808_clkout->clkout1_hw.init = &init;

	/* optional override of the clockname */
	of_property_read_string_index(node, "clock-output-names",
				      0, &init.name);

	ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
	if (ret)
		return ret;

	init.name = "rk808-clkout2";
	init.ops = &rk808_clkout2_ops;
	rk808_clkout->clkout2_hw.init = &init;

	/* optional override of the clockname */
	of_property_read_string_index(node, "clock-output-names",
				      1, &init.name);

	ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
	if (ret)
		return ret;

	return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
					   rk808_clkout);
}

static struct platform_driver rk808_clkout_driver = {
	.probe = rk808_clkout_probe,
	.driver		= {
		.name	= "rk808-clkout",
	},
};

module_platform_driver(rk808_clkout_driver);

MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-clkout");