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>
31 #define s2mps11_name(a) (a->hw.init->name)
33 static struct clk **clk_table;
34 static struct clk_onecell_data clk_data;
44 struct sec_pmic_dev *iodev;
45 struct device_node *clk_np;
48 struct clk_lookup *lookup;
53 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
55 return container_of(hw, struct s2mps11_clk, hw);
58 static int s2mps11_clk_prepare(struct clk_hw *hw)
60 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
63 ret = regmap_update_bits(s2mps11->iodev->regmap_pmic,
65 s2mps11->mask, s2mps11->mask);
70 static void s2mps11_clk_unprepare(struct clk_hw *hw)
72 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
75 ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
76 s2mps11->mask, ~s2mps11->mask);
79 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
83 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
85 ret = regmap_read(s2mps11->iodev->regmap_pmic,
90 return val & s2mps11->mask;
93 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
94 unsigned long parent_rate)
99 static struct clk_ops s2mps11_clk_ops = {
100 .prepare = s2mps11_clk_prepare,
101 .unprepare = s2mps11_clk_unprepare,
102 .is_prepared = s2mps11_clk_is_prepared,
103 .recalc_rate = s2mps11_clk_recalc_rate,
106 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
108 .name = "s2mps11_ap",
109 .ops = &s2mps11_clk_ops,
110 .flags = CLK_IS_ROOT,
113 .name = "s2mps11_cp",
114 .ops = &s2mps11_clk_ops,
115 .flags = CLK_IS_ROOT,
118 .name = "s2mps11_bt",
119 .ops = &s2mps11_clk_ops,
120 .flags = CLK_IS_ROOT,
124 static struct clk_init_data s2mps13_clks_init[S2MPS11_CLKS_NUM] = {
126 .name = "s2mps13_ap",
127 .ops = &s2mps11_clk_ops,
128 .flags = CLK_IS_ROOT,
131 .name = "s2mps13_cp",
132 .ops = &s2mps11_clk_ops,
133 .flags = CLK_IS_ROOT,
136 .name = "s2mps13_bt",
137 .ops = &s2mps11_clk_ops,
138 .flags = CLK_IS_ROOT,
142 static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = {
144 .name = "s2mps14_ap",
145 .ops = &s2mps11_clk_ops,
146 .flags = CLK_IS_ROOT,
149 .name = "s2mps14_bt",
150 .ops = &s2mps11_clk_ops,
151 .flags = CLK_IS_ROOT,
155 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
156 struct clk_init_data *clks_init)
158 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
159 struct device_node *clk_np;
162 if (!iodev->dev->of_node)
163 return ERR_PTR(-EINVAL);
165 clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
167 dev_err(&pdev->dev, "could not find clock sub-node\n");
168 return ERR_PTR(-EINVAL);
171 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
172 if (!clks_init[i].name)
173 continue; /* Skip clocks not present in some devices */
174 of_property_read_string_index(clk_np, "clock-output-names", i,
181 static int s2mps11_clk_probe(struct platform_device *pdev)
183 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
184 struct s2mps11_clk *s2mps11_clks, *s2mps11_clk;
185 unsigned int s2mps11_reg;
186 struct clk_init_data *clks_init;
189 s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) *
190 S2MPS11_CLKS_NUM, GFP_KERNEL);
194 s2mps11_clk = s2mps11_clks;
196 clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) *
197 S2MPS11_CLKS_NUM, GFP_KERNEL);
201 switch(platform_get_device_id(pdev)->driver_data) {
203 s2mps11_reg = S2MPS11_REG_RTC_CTRL;
204 clks_init = s2mps11_clks_init;
207 s2mps11_reg = S2MPS13_REG_RTCCTRL;
208 clks_init = s2mps13_clks_init;
211 s2mps11_reg = S2MPS14_REG_RTCCTRL;
212 clks_init = s2mps14_clks_init;
215 s2mps11_reg = S5M8767_REG_CTRL1;
216 clks_init = s2mps11_clks_init;
219 dev_err(&pdev->dev, "Invalid device type\n");
223 /* Store clocks of_node in first element of s2mps11_clks array */
224 s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init);
225 if (IS_ERR(s2mps11_clks->clk_np))
226 return PTR_ERR(s2mps11_clks->clk_np);
228 for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
229 if (!clks_init[i].name)
230 continue; /* Skip clocks not present in some devices */
231 s2mps11_clk->iodev = iodev;
232 s2mps11_clk->hw.init = &clks_init[i];
233 s2mps11_clk->mask = 1 << i;
234 s2mps11_clk->reg = s2mps11_reg;
236 s2mps11_clk->clk = devm_clk_register(&pdev->dev,
238 if (IS_ERR(s2mps11_clk->clk)) {
239 dev_err(&pdev->dev, "Fail to register : %s\n",
240 s2mps11_name(s2mps11_clk));
241 ret = PTR_ERR(s2mps11_clk->clk);
245 s2mps11_clk->lookup = clkdev_create(s2mps11_clk->clk,
246 s2mps11_name(s2mps11_clk), NULL);
247 if (!s2mps11_clk->lookup) {
253 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
254 /* Skip clocks not present on S2MPS14 */
255 if (!clks_init[i].name)
257 clk_table[i] = s2mps11_clks[i].clk;
260 clk_data.clks = clk_table;
261 clk_data.clk_num = S2MPS11_CLKS_NUM;
262 of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get,
265 platform_set_drvdata(pdev, s2mps11_clks);
271 clkdev_drop(s2mps11_clks[i].lookup);
276 static int s2mps11_clk_remove(struct platform_device *pdev)
278 struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
281 of_clk_del_provider(s2mps11_clks[0].clk_np);
282 /* Drop the reference obtained in s2mps11_clk_parse_dt */
283 of_node_put(s2mps11_clks[0].clk_np);
285 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
286 /* Skip clocks not present on S2MPS14 */
287 if (!s2mps11_clks[i].lookup)
289 clkdev_drop(s2mps11_clks[i].lookup);
295 static const struct platform_device_id s2mps11_clk_id[] = {
296 { "s2mps11-clk", S2MPS11X},
297 { "s2mps13-clk", S2MPS13X},
298 { "s2mps14-clk", S2MPS14X},
299 { "s5m8767-clk", S5M8767X},
302 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
304 static struct platform_driver s2mps11_clk_driver = {
306 .name = "s2mps11-clk",
308 .probe = s2mps11_clk_probe,
309 .remove = s2mps11_clk_remove,
310 .id_table = s2mps11_clk_id,
313 static int __init s2mps11_clk_init(void)
315 return platform_driver_register(&s2mps11_clk_driver);
317 subsys_initcall(s2mps11_clk_init);
319 static void __init s2mps11_clk_cleanup(void)
321 platform_driver_unregister(&s2mps11_clk_driver);
323 module_exit(s2mps11_clk_cleanup);
325 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
326 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
327 MODULE_LICENSE("GPL");