2 * clk-s2mps11.c - Clock driver for S2MPS11.
4 * Copyright (C) 2013,2014 Samsung Electornics
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
18 #include <linux/module.h>
19 #include <linux/err.h>
21 #include <linux/clkdev.h>
22 #include <linux/regmap.h>
23 #include <linux/clk-provider.h>
24 #include <linux/platform_device.h>
25 #include <linux/mfd/samsung/s2mps11.h>
26 #include <linux/mfd/samsung/s2mps13.h>
27 #include <linux/mfd/samsung/s2mps14.h>
28 #include <linux/mfd/samsung/s5m8767.h>
29 #include <linux/mfd/samsung/core.h>
39 struct sec_pmic_dev *iodev;
40 struct device_node *clk_np;
43 struct clk_lookup *lookup;
48 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
50 return container_of(hw, struct s2mps11_clk, hw);
53 static int s2mps11_clk_prepare(struct clk_hw *hw)
55 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
57 return regmap_update_bits(s2mps11->iodev->regmap_pmic,
59 s2mps11->mask, s2mps11->mask);
62 static void s2mps11_clk_unprepare(struct clk_hw *hw)
64 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
66 regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
67 s2mps11->mask, ~s2mps11->mask);
70 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
74 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
76 ret = regmap_read(s2mps11->iodev->regmap_pmic,
81 return val & s2mps11->mask;
84 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
85 unsigned long parent_rate)
90 static struct clk_ops s2mps11_clk_ops = {
91 .prepare = s2mps11_clk_prepare,
92 .unprepare = s2mps11_clk_unprepare,
93 .is_prepared = s2mps11_clk_is_prepared,
94 .recalc_rate = s2mps11_clk_recalc_rate,
97 /* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
98 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
100 .name = "s2mps11_ap",
101 .ops = &s2mps11_clk_ops,
104 .name = "s2mps11_cp",
105 .ops = &s2mps11_clk_ops,
108 .name = "s2mps11_bt",
109 .ops = &s2mps11_clk_ops,
113 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
114 struct clk_init_data *clks_init)
116 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
117 struct device_node *clk_np;
120 if (!iodev->dev->of_node)
121 return ERR_PTR(-EINVAL);
123 clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
125 dev_err(&pdev->dev, "could not find clock sub-node\n");
126 return ERR_PTR(-EINVAL);
129 for (i = 0; i < S2MPS11_CLKS_NUM; i++)
130 of_property_read_string_index(clk_np, "clock-output-names", i,
136 static int s2mps11_clk_probe(struct platform_device *pdev)
138 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
139 struct s2mps11_clk *s2mps11_clks;
140 struct clk_hw_onecell_data *clk_data;
141 unsigned int s2mps11_reg;
143 enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data;
145 s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
146 sizeof(*s2mps11_clks), GFP_KERNEL);
150 clk_data = devm_kzalloc(&pdev->dev, sizeof(*clk_data) +
151 sizeof(*clk_data->hws) * S2MPS11_CLKS_NUM,
158 s2mps11_reg = S2MPS11_REG_RTC_CTRL;
161 s2mps11_reg = S2MPS13_REG_RTCCTRL;
164 s2mps11_reg = S2MPS14_REG_RTCCTRL;
167 s2mps11_reg = S5M8767_REG_CTRL1;
170 dev_err(&pdev->dev, "Invalid device type\n");
174 /* Store clocks of_node in first element of s2mps11_clks array */
175 s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init);
176 if (IS_ERR(s2mps11_clks->clk_np))
177 return PTR_ERR(s2mps11_clks->clk_np);
179 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
180 if (i == S2MPS11_CLK_CP && hwid == S2MPS14X)
181 continue; /* Skip clocks not present in some devices */
182 s2mps11_clks[i].iodev = iodev;
183 s2mps11_clks[i].hw.init = &s2mps11_clks_init[i];
184 s2mps11_clks[i].mask = 1 << i;
185 s2mps11_clks[i].reg = s2mps11_reg;
187 s2mps11_clks[i].clk = devm_clk_register(&pdev->dev,
188 &s2mps11_clks[i].hw);
189 if (IS_ERR(s2mps11_clks[i].clk)) {
190 dev_err(&pdev->dev, "Fail to register : %s\n",
191 s2mps11_clks_init[i].name);
192 ret = PTR_ERR(s2mps11_clks[i].clk);
196 s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw,
197 s2mps11_clks_init[i].name, NULL);
198 if (!s2mps11_clks[i].lookup) {
202 clk_data->hws[i] = &s2mps11_clks[i].hw;
205 clk_data->num = S2MPS11_CLKS_NUM;
206 of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get,
209 platform_set_drvdata(pdev, s2mps11_clks);
214 of_node_put(s2mps11_clks[0].clk_np);
216 clkdev_drop(s2mps11_clks[i].lookup);
221 static int s2mps11_clk_remove(struct platform_device *pdev)
223 struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
226 of_clk_del_provider(s2mps11_clks[0].clk_np);
227 /* Drop the reference obtained in s2mps11_clk_parse_dt */
228 of_node_put(s2mps11_clks[0].clk_np);
230 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
231 /* Skip clocks not present on S2MPS14 */
232 if (!s2mps11_clks[i].lookup)
234 clkdev_drop(s2mps11_clks[i].lookup);
240 static const struct platform_device_id s2mps11_clk_id[] = {
241 { "s2mps11-clk", S2MPS11X},
242 { "s2mps13-clk", S2MPS13X},
243 { "s2mps14-clk", S2MPS14X},
244 { "s5m8767-clk", S5M8767X},
247 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
251 * Device is instantiated through parent MFD device and device matching is done
252 * through platform_device_id.
254 * However if device's DT node contains proper clock compatible and driver is
255 * built as a module, then the *module* matching will be done trough DT aliases.
256 * This requires of_device_id table. In the same time this will not change the
257 * actual *device* matching so do not add .of_match_table.
259 static const struct of_device_id s2mps11_dt_match[] __used = {
261 .compatible = "samsung,s2mps11-clk",
262 .data = (void *)S2MPS11X,
264 .compatible = "samsung,s2mps13-clk",
265 .data = (void *)S2MPS13X,
267 .compatible = "samsung,s2mps14-clk",
268 .data = (void *)S2MPS14X,
270 .compatible = "samsung,s5m8767-clk",
271 .data = (void *)S5M8767X,
276 MODULE_DEVICE_TABLE(of, s2mps11_dt_match);
279 static struct platform_driver s2mps11_clk_driver = {
281 .name = "s2mps11-clk",
283 .probe = s2mps11_clk_probe,
284 .remove = s2mps11_clk_remove,
285 .id_table = s2mps11_clk_id,
288 static int __init s2mps11_clk_init(void)
290 return platform_driver_register(&s2mps11_clk_driver);
292 subsys_initcall(s2mps11_clk_init);
294 static void __exit s2mps11_clk_cleanup(void)
296 platform_driver_unregister(&s2mps11_clk_driver);
298 module_exit(s2mps11_clk_cleanup);
300 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
301 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
302 MODULE_LICENSE("GPL");