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18#include <linux/clk-provider.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/platform_device.h>
22#include <linux/mfd/rk808.h>
23#include <linux/i2c.h>
24
25#define RK808_NR_OUTPUT 2
26
27struct rk808_clkout {
28 struct rk808 *rk808;
29 struct clk_onecell_data clk_data;
30 struct clk_hw clkout1_hw;
31 struct clk_hw clkout2_hw;
32};
33
34static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
35 unsigned long parent_rate)
36{
37 return 32768;
38}
39
40static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
41{
42 struct rk808_clkout *rk808_clkout = container_of(hw,
43 struct rk808_clkout,
44 clkout2_hw);
45 struct rk808 *rk808 = rk808_clkout->rk808;
46
47 return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
48 CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
49}
50
51static int rk808_clkout2_prepare(struct clk_hw *hw)
52{
53 return rk808_clkout2_enable(hw, true);
54}
55
56static void rk808_clkout2_unprepare(struct clk_hw *hw)
57{
58 rk808_clkout2_enable(hw, false);
59}
60
61static int rk808_clkout2_is_prepared(struct clk_hw *hw)
62{
63 struct rk808_clkout *rk808_clkout = container_of(hw,
64 struct rk808_clkout,
65 clkout2_hw);
66 struct rk808 *rk808 = rk808_clkout->rk808;
67 uint32_t val;
68
69 int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
70
71 if (ret < 0)
72 return ret;
73
74 return (val & CLK32KOUT2_EN) ? 1 : 0;
75}
76
77static const struct clk_ops rk808_clkout1_ops = {
78 .recalc_rate = rk808_clkout_recalc_rate,
79};
80
81static const struct clk_ops rk808_clkout2_ops = {
82 .prepare = rk808_clkout2_prepare,
83 .unprepare = rk808_clkout2_unprepare,
84 .is_prepared = rk808_clkout2_is_prepared,
85 .recalc_rate = rk808_clkout_recalc_rate,
86};
87
88static int rk808_clkout_probe(struct platform_device *pdev)
89{
90 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
91 struct i2c_client *client = rk808->i2c;
92 struct device_node *node = client->dev.of_node;
93 struct clk_init_data init = {};
94 struct clk **clk_table;
95 struct rk808_clkout *rk808_clkout;
96
97 rk808_clkout = devm_kzalloc(&client->dev,
98 sizeof(*rk808_clkout), GFP_KERNEL);
99 if (!rk808_clkout)
100 return -ENOMEM;
101
102 rk808_clkout->rk808 = rk808;
103
104 clk_table = devm_kcalloc(&client->dev, RK808_NR_OUTPUT,
105 sizeof(struct clk *), GFP_KERNEL);
106 if (!clk_table)
107 return -ENOMEM;
108
109 init.parent_names = NULL;
110 init.num_parents = 0;
111 init.name = "rk808-clkout1";
112 init.ops = &rk808_clkout1_ops;
113 rk808_clkout->clkout1_hw.init = &init;
114
115
116 of_property_read_string_index(node, "clock-output-names",
117 0, &init.name);
118
119 clk_table[0] = devm_clk_register(&client->dev,
120 &rk808_clkout->clkout1_hw);
121 if (IS_ERR(clk_table[0]))
122 return PTR_ERR(clk_table[0]);
123
124 init.name = "rk808-clkout2";
125 init.ops = &rk808_clkout2_ops;
126 rk808_clkout->clkout2_hw.init = &init;
127
128
129 of_property_read_string_index(node, "clock-output-names",
130 1, &init.name);
131
132 clk_table[1] = devm_clk_register(&client->dev,
133 &rk808_clkout->clkout2_hw);
134 if (IS_ERR(clk_table[1]))
135 return PTR_ERR(clk_table[1]);
136
137 rk808_clkout->clk_data.clks = clk_table;
138 rk808_clkout->clk_data.clk_num = RK808_NR_OUTPUT;
139
140 return of_clk_add_provider(node, of_clk_src_onecell_get,
141 &rk808_clkout->clk_data);
142}
143
144static int rk808_clkout_remove(struct platform_device *pdev)
145{
146 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
147 struct i2c_client *client = rk808->i2c;
148 struct device_node *node = client->dev.of_node;
149
150 of_clk_del_provider(node);
151
152 return 0;
153}
154
155static struct platform_driver rk808_clkout_driver = {
156 .probe = rk808_clkout_probe,
157 .remove = rk808_clkout_remove,
158 .driver = {
159 .name = "rk808-clkout",
160 },
161};
162
163module_platform_driver(rk808_clkout_driver);
164
165MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
166MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
167MODULE_LICENSE("GPL");
168MODULE_ALIAS("platform:rk808-clkout");
169
