1
2
3
4
5
6
7
8
9
10#include <linux/clk-provider.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/platform_device.h>
14#include <linux/mfd/rk808.h>
15#include <linux/i2c.h>
16
17struct rk808_clkout {
18 struct rk808 *rk808;
19 struct clk_hw clkout1_hw;
20 struct clk_hw clkout2_hw;
21};
22
23static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
24 unsigned long parent_rate)
25{
26 return 32768;
27}
28
29static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
30{
31 struct rk808_clkout *rk808_clkout = container_of(hw,
32 struct rk808_clkout,
33 clkout2_hw);
34 struct rk808 *rk808 = rk808_clkout->rk808;
35
36 return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
37 CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
38}
39
40static int rk808_clkout2_prepare(struct clk_hw *hw)
41{
42 return rk808_clkout2_enable(hw, true);
43}
44
45static void rk808_clkout2_unprepare(struct clk_hw *hw)
46{
47 rk808_clkout2_enable(hw, false);
48}
49
50static int rk808_clkout2_is_prepared(struct clk_hw *hw)
51{
52 struct rk808_clkout *rk808_clkout = container_of(hw,
53 struct rk808_clkout,
54 clkout2_hw);
55 struct rk808 *rk808 = rk808_clkout->rk808;
56 uint32_t val;
57
58 int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
59
60 if (ret < 0)
61 return ret;
62
63 return (val & CLK32KOUT2_EN) ? 1 : 0;
64}
65
66static const struct clk_ops rk808_clkout1_ops = {
67 .recalc_rate = rk808_clkout_recalc_rate,
68};
69
70static const struct clk_ops rk808_clkout2_ops = {
71 .prepare = rk808_clkout2_prepare,
72 .unprepare = rk808_clkout2_unprepare,
73 .is_prepared = rk808_clkout2_is_prepared,
74 .recalc_rate = rk808_clkout_recalc_rate,
75};
76
77static struct clk_hw *
78of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
79{
80 struct rk808_clkout *rk808_clkout = data;
81 unsigned int idx = clkspec->args[0];
82
83 if (idx >= 2) {
84 pr_err("%s: invalid index %u\n", __func__, idx);
85 return ERR_PTR(-EINVAL);
86 }
87
88 return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
89}
90
91static int rk817_clkout2_enable(struct clk_hw *hw, bool enable)
92{
93 struct rk808_clkout *rk808_clkout = container_of(hw,
94 struct rk808_clkout,
95 clkout2_hw);
96 struct rk808 *rk808 = rk808_clkout->rk808;
97
98 return regmap_update_bits(rk808->regmap, RK817_SYS_CFG(1),
99 RK817_CLK32KOUT2_EN,
100 enable ? RK817_CLK32KOUT2_EN : 0);
101}
102
103static int rk817_clkout2_prepare(struct clk_hw *hw)
104{
105 return rk817_clkout2_enable(hw, true);
106}
107
108static void rk817_clkout2_unprepare(struct clk_hw *hw)
109{
110 rk817_clkout2_enable(hw, false);
111}
112
113static int rk817_clkout2_is_prepared(struct clk_hw *hw)
114{
115 struct rk808_clkout *rk808_clkout = container_of(hw,
116 struct rk808_clkout,
117 clkout2_hw);
118 struct rk808 *rk808 = rk808_clkout->rk808;
119 unsigned int val;
120
121 int ret = regmap_read(rk808->regmap, RK817_SYS_CFG(1), &val);
122
123 if (ret < 0)
124 return 0;
125
126 return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
127}
128
129static const struct clk_ops rk817_clkout2_ops = {
130 .prepare = rk817_clkout2_prepare,
131 .unprepare = rk817_clkout2_unprepare,
132 .is_prepared = rk817_clkout2_is_prepared,
133 .recalc_rate = rk808_clkout_recalc_rate,
134};
135
136static const struct clk_ops *rkpmic_get_ops(long variant)
137{
138 switch (variant) {
139 case RK809_ID:
140 case RK817_ID:
141 return &rk817_clkout2_ops;
142
143
144
145
146
147
148 default:
149 return &rk808_clkout2_ops;
150 }
151}
152
153static int rk808_clkout_probe(struct platform_device *pdev)
154{
155 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
156 struct i2c_client *client = rk808->i2c;
157 struct device_node *node = client->dev.of_node;
158 struct clk_init_data init = {};
159 struct rk808_clkout *rk808_clkout;
160 int ret;
161
162 rk808_clkout = devm_kzalloc(&client->dev,
163 sizeof(*rk808_clkout), GFP_KERNEL);
164 if (!rk808_clkout)
165 return -ENOMEM;
166
167 rk808_clkout->rk808 = rk808;
168
169 init.parent_names = NULL;
170 init.num_parents = 0;
171 init.name = "rk808-clkout1";
172 init.ops = &rk808_clkout1_ops;
173 rk808_clkout->clkout1_hw.init = &init;
174
175
176 of_property_read_string_index(node, "clock-output-names",
177 0, &init.name);
178
179 ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
180 if (ret)
181 return ret;
182
183 init.name = "rk808-clkout2";
184 init.ops = rkpmic_get_ops(rk808->variant);
185 rk808_clkout->clkout2_hw.init = &init;
186
187
188 of_property_read_string_index(node, "clock-output-names",
189 1, &init.name);
190
191 ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
192 if (ret)
193 return ret;
194
195 return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
196 rk808_clkout);
197}
198
199static struct platform_driver rk808_clkout_driver = {
200 .probe = rk808_clkout_probe,
201 .driver = {
202 .name = "rk808-clkout",
203 },
204};
205
206module_platform_driver(rk808_clkout_driver);
207
208MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
209MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
210MODULE_LICENSE("GPL");
211MODULE_ALIAS("platform:rk808-clkout");
212
