1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2017 NXP
4 *
5 * Dong Aisheng <aisheng.dong@nxp.com>
6 */
7
8 #include <linux/clk.h>
9 #include <linux/clk-provider.h>
10 #include <linux/device.h>
11 #include <linux/export.h>
12 #include <linux/of.h>
13 #include <linux/slab.h>
14
of_clk_bulk_get(struct device_node * np,int num_clks,struct clk_bulk_data * clks)15 static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
16 struct clk_bulk_data *clks)
17 {
18 int ret;
19 int i;
20
21 for (i = 0; i < num_clks; i++) {
22 clks[i].id = NULL;
23 clks[i].clk = NULL;
24 }
25
26 for (i = 0; i < num_clks; i++) {
27 of_property_read_string_index(np, "clock-names", i, &clks[i].id);
28 clks[i].clk = of_clk_get(np, i);
29 if (IS_ERR(clks[i].clk)) {
30 ret = PTR_ERR(clks[i].clk);
31 pr_err("%pOF: Failed to get clk index: %d ret: %d\n",
32 np, i, ret);
33 clks[i].clk = NULL;
34 goto err;
35 }
36 }
37
38 return 0;
39
40 err:
41 clk_bulk_put(i, clks);
42
43 return ret;
44 }
45
of_clk_bulk_get_all(struct device_node * np,struct clk_bulk_data ** clks)46 static int __must_check of_clk_bulk_get_all(struct device_node *np,
47 struct clk_bulk_data **clks)
48 {
49 struct clk_bulk_data *clk_bulk;
50 int num_clks;
51 int ret;
52
53 num_clks = of_clk_get_parent_count(np);
54 if (!num_clks)
55 return 0;
56
57 clk_bulk = kmalloc_array(num_clks, sizeof(*clk_bulk), GFP_KERNEL);
58 if (!clk_bulk)
59 return -ENOMEM;
60
61 ret = of_clk_bulk_get(np, num_clks, clk_bulk);
62 if (ret) {
63 kfree(clk_bulk);
64 return ret;
65 }
66
67 *clks = clk_bulk;
68
69 return num_clks;
70 }
71
clk_bulk_put(int num_clks,struct clk_bulk_data * clks)72 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
73 {
74 while (--num_clks >= 0) {
75 clk_put(clks[num_clks].clk);
76 clks[num_clks].clk = NULL;
77 }
78 }
79 EXPORT_SYMBOL_GPL(clk_bulk_put);
80
__clk_bulk_get(struct device * dev,int num_clks,struct clk_bulk_data * clks,bool optional)81 static int __clk_bulk_get(struct device *dev, int num_clks,
82 struct clk_bulk_data *clks, bool optional)
83 {
84 int ret;
85 int i;
86
87 for (i = 0; i < num_clks; i++)
88 clks[i].clk = NULL;
89
90 for (i = 0; i < num_clks; i++) {
91 clks[i].clk = clk_get(dev, clks[i].id);
92 if (IS_ERR(clks[i].clk)) {
93 ret = PTR_ERR(clks[i].clk);
94 clks[i].clk = NULL;
95
96 if (ret == -ENOENT && optional)
97 continue;
98
99 dev_err_probe(dev, ret,
100 "Failed to get clk '%s'\n",
101 clks[i].id);
102 goto err;
103 }
104 }
105
106 return 0;
107
108 err:
109 clk_bulk_put(i, clks);
110
111 return ret;
112 }
113
clk_bulk_get(struct device * dev,int num_clks,struct clk_bulk_data * clks)114 int __must_check clk_bulk_get(struct device *dev, int num_clks,
115 struct clk_bulk_data *clks)
116 {
117 return __clk_bulk_get(dev, num_clks, clks, false);
118 }
119 EXPORT_SYMBOL(clk_bulk_get);
120
clk_bulk_get_optional(struct device * dev,int num_clks,struct clk_bulk_data * clks)121 int __must_check clk_bulk_get_optional(struct device *dev, int num_clks,
122 struct clk_bulk_data *clks)
123 {
124 return __clk_bulk_get(dev, num_clks, clks, true);
125 }
126 EXPORT_SYMBOL_GPL(clk_bulk_get_optional);
127
clk_bulk_put_all(int num_clks,struct clk_bulk_data * clks)128 void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks)
129 {
130 if (IS_ERR_OR_NULL(clks))
131 return;
132
133 clk_bulk_put(num_clks, clks);
134
135 kfree(clks);
136 }
137 EXPORT_SYMBOL(clk_bulk_put_all);
138
clk_bulk_get_all(struct device * dev,struct clk_bulk_data ** clks)139 int __must_check clk_bulk_get_all(struct device *dev,
140 struct clk_bulk_data **clks)
141 {
142 struct device_node *np = dev_of_node(dev);
143
144 if (!np)
145 return 0;
146
147 return of_clk_bulk_get_all(np, clks);
148 }
149 EXPORT_SYMBOL(clk_bulk_get_all);
150
151 #ifdef CONFIG_HAVE_CLK_PREPARE
152
153 /**
154 * clk_bulk_unprepare - undo preparation of a set of clock sources
155 * @num_clks: the number of clk_bulk_data
156 * @clks: the clk_bulk_data table being unprepared
157 *
158 * clk_bulk_unprepare may sleep, which differentiates it from clk_bulk_disable.
159 * Returns 0 on success, -EERROR otherwise.
160 */
clk_bulk_unprepare(int num_clks,const struct clk_bulk_data * clks)161 void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks)
162 {
163 while (--num_clks >= 0)
164 clk_unprepare(clks[num_clks].clk);
165 }
166 EXPORT_SYMBOL_GPL(clk_bulk_unprepare);
167
168 /**
169 * clk_bulk_prepare - prepare a set of clocks
170 * @num_clks: the number of clk_bulk_data
171 * @clks: the clk_bulk_data table being prepared
172 *
173 * clk_bulk_prepare may sleep, which differentiates it from clk_bulk_enable.
174 * Returns 0 on success, -EERROR otherwise.
175 */
clk_bulk_prepare(int num_clks,const struct clk_bulk_data * clks)176 int __must_check clk_bulk_prepare(int num_clks,
177 const struct clk_bulk_data *clks)
178 {
179 int ret;
180 int i;
181
182 for (i = 0; i < num_clks; i++) {
183 ret = clk_prepare(clks[i].clk);
184 if (ret) {
185 pr_err("Failed to prepare clk '%s': %d\n",
186 clks[i].id, ret);
187 goto err;
188 }
189 }
190
191 return 0;
192
193 err:
194 clk_bulk_unprepare(i, clks);
195
196 return ret;
197 }
198 EXPORT_SYMBOL_GPL(clk_bulk_prepare);
199
200 #endif /* CONFIG_HAVE_CLK_PREPARE */
201
202 /**
203 * clk_bulk_disable - gate a set of clocks
204 * @num_clks: the number of clk_bulk_data
205 * @clks: the clk_bulk_data table being gated
206 *
207 * clk_bulk_disable must not sleep, which differentiates it from
208 * clk_bulk_unprepare. clk_bulk_disable must be called before
209 * clk_bulk_unprepare.
210 */
clk_bulk_disable(int num_clks,const struct clk_bulk_data * clks)211 void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks)
212 {
213
214 while (--num_clks >= 0)
215 clk_disable(clks[num_clks].clk);
216 }
217 EXPORT_SYMBOL_GPL(clk_bulk_disable);
218
219 /**
220 * clk_bulk_enable - ungate a set of clocks
221 * @num_clks: the number of clk_bulk_data
222 * @clks: the clk_bulk_data table being ungated
223 *
224 * clk_bulk_enable must not sleep
225 * Returns 0 on success, -EERROR otherwise.
226 */
clk_bulk_enable(int num_clks,const struct clk_bulk_data * clks)227 int __must_check clk_bulk_enable(int num_clks, const struct clk_bulk_data *clks)
228 {
229 int ret;
230 int i;
231
232 for (i = 0; i < num_clks; i++) {
233 ret = clk_enable(clks[i].clk);
234 if (ret) {
235 pr_err("Failed to enable clk '%s': %d\n",
236 clks[i].id, ret);
237 goto err;
238 }
239 }
240
241 return 0;
242
243 err:
244 clk_bulk_disable(i, clks);
245
246 return ret;
247 }
248 EXPORT_SYMBOL_GPL(clk_bulk_enable);
249