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);
62 return regmap_update_bits(s2mps11->iodev->regmap_pmic,
64 s2mps11->mask, s2mps11->mask);
67 static void s2mps11_clk_unprepare(struct clk_hw *hw)
69 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
71 regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
72 s2mps11->mask, ~s2mps11->mask);
75 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
79 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
81 ret = regmap_read(s2mps11->iodev->regmap_pmic,
86 return val & s2mps11->mask;
89 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
90 unsigned long parent_rate)
95 static struct clk_ops s2mps11_clk_ops = {
96 .prepare = s2mps11_clk_prepare,
97 .unprepare = s2mps11_clk_unprepare,
98 .is_prepared = s2mps11_clk_is_prepared,
99 .recalc_rate = s2mps11_clk_recalc_rate,
102 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
104 .name = "s2mps11_ap",
105 .ops = &s2mps11_clk_ops,
106 .flags = CLK_IS_ROOT,
109 .name = "s2mps11_cp",
110 .ops = &s2mps11_clk_ops,
111 .flags = CLK_IS_ROOT,
114 .name = "s2mps11_bt",
115 .ops = &s2mps11_clk_ops,
116 .flags = CLK_IS_ROOT,
120 static struct clk_init_data s2mps13_clks_init[S2MPS11_CLKS_NUM] = {
122 .name = "s2mps13_ap",
123 .ops = &s2mps11_clk_ops,
124 .flags = CLK_IS_ROOT,
127 .name = "s2mps13_cp",
128 .ops = &s2mps11_clk_ops,
129 .flags = CLK_IS_ROOT,
132 .name = "s2mps13_bt",
133 .ops = &s2mps11_clk_ops,
134 .flags = CLK_IS_ROOT,
138 static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = {
140 .name = "s2mps14_ap",
141 .ops = &s2mps11_clk_ops,
142 .flags = CLK_IS_ROOT,
145 .name = "s2mps14_bt",
146 .ops = &s2mps11_clk_ops,
147 .flags = CLK_IS_ROOT,
151 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
152 struct clk_init_data *clks_init)
154 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
155 struct device_node *clk_np;
158 if (!iodev->dev->of_node)
159 return ERR_PTR(-EINVAL);
161 clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
163 dev_err(&pdev->dev, "could not find clock sub-node\n");
164 return ERR_PTR(-EINVAL);
167 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
168 if (!clks_init[i].name)
169 continue; /* Skip clocks not present in some devices */
170 of_property_read_string_index(clk_np, "clock-output-names", i,
177 static int s2mps11_clk_probe(struct platform_device *pdev)
179 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
180 struct s2mps11_clk *s2mps11_clks, *s2mps11_clk;
181 unsigned int s2mps11_reg;
182 struct clk_init_data *clks_init;
185 s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
186 sizeof(*s2mps11_clk), GFP_KERNEL);
190 s2mps11_clk = s2mps11_clks;
192 clk_table = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
193 sizeof(struct clk *), GFP_KERNEL);
197 switch(platform_get_device_id(pdev)->driver_data) {
199 s2mps11_reg = S2MPS11_REG_RTC_CTRL;
200 clks_init = s2mps11_clks_init;
203 s2mps11_reg = S2MPS13_REG_RTCCTRL;
204 clks_init = s2mps13_clks_init;
207 s2mps11_reg = S2MPS14_REG_RTCCTRL;
208 clks_init = s2mps14_clks_init;
211 s2mps11_reg = S5M8767_REG_CTRL1;
212 clks_init = s2mps11_clks_init;
215 dev_err(&pdev->dev, "Invalid device type\n");
219 /* Store clocks of_node in first element of s2mps11_clks array */
220 s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init);
221 if (IS_ERR(s2mps11_clks->clk_np))
222 return PTR_ERR(s2mps11_clks->clk_np);
224 for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
225 if (!clks_init[i].name)
226 continue; /* Skip clocks not present in some devices */
227 s2mps11_clk->iodev = iodev;
228 s2mps11_clk->hw.init = &clks_init[i];
229 s2mps11_clk->mask = 1 << i;
230 s2mps11_clk->reg = s2mps11_reg;
232 s2mps11_clk->clk = devm_clk_register(&pdev->dev,
234 if (IS_ERR(s2mps11_clk->clk)) {
235 dev_err(&pdev->dev, "Fail to register : %s\n",
236 s2mps11_name(s2mps11_clk));
237 ret = PTR_ERR(s2mps11_clk->clk);
241 s2mps11_clk->lookup = clkdev_create(s2mps11_clk->clk,
242 s2mps11_name(s2mps11_clk), NULL);
243 if (!s2mps11_clk->lookup) {
249 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
250 /* Skip clocks not present on S2MPS14 */
251 if (!clks_init[i].name)
253 clk_table[i] = s2mps11_clks[i].clk;
256 clk_data.clks = clk_table;
257 clk_data.clk_num = S2MPS11_CLKS_NUM;
258 of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get,
261 platform_set_drvdata(pdev, s2mps11_clks);
267 clkdev_drop(s2mps11_clks[i].lookup);
272 static int s2mps11_clk_remove(struct platform_device *pdev)
274 struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
277 of_clk_del_provider(s2mps11_clks[0].clk_np);
278 /* Drop the reference obtained in s2mps11_clk_parse_dt */
279 of_node_put(s2mps11_clks[0].clk_np);
281 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
282 /* Skip clocks not present on S2MPS14 */
283 if (!s2mps11_clks[i].lookup)
285 clkdev_drop(s2mps11_clks[i].lookup);
291 static const struct platform_device_id s2mps11_clk_id[] = {
292 { "s2mps11-clk", S2MPS11X},
293 { "s2mps13-clk", S2MPS13X},
294 { "s2mps14-clk", S2MPS14X},
295 { "s5m8767-clk", S5M8767X},
298 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
300 static struct platform_driver s2mps11_clk_driver = {
302 .name = "s2mps11-clk",
304 .probe = s2mps11_clk_probe,
305 .remove = s2mps11_clk_remove,
306 .id_table = s2mps11_clk_id,
309 static int __init s2mps11_clk_init(void)
311 return platform_driver_register(&s2mps11_clk_driver);
313 subsys_initcall(s2mps11_clk_init);
315 static void __exit s2mps11_clk_cleanup(void)
317 platform_driver_unregister(&s2mps11_clk_driver);
319 module_exit(s2mps11_clk_cleanup);
321 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
322 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
323 MODULE_LICENSE("GPL");