Merge branch 'next/drivers' into next/late
[linux-2.6-microblaze.git] / drivers / clk / clk-bulk.c
1 /*
2  * Copyright 2017 NXP
3  *
4  * Dong Aisheng <aisheng.dong@nxp.com>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18
19 #include <linux/clk.h>
20 #include <linux/clk-provider.h>
21 #include <linux/device.h>
22 #include <linux/export.h>
23 #include <linux/of.h>
24 #include <linux/slab.h>
25
26 static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
27                                         struct clk_bulk_data *clks)
28 {
29         int ret;
30         int i;
31
32         for (i = 0; i < num_clks; i++)
33                 clks[i].clk = NULL;
34
35         for (i = 0; i < num_clks; i++) {
36                 clks[i].clk = of_clk_get(np, i);
37                 if (IS_ERR(clks[i].clk)) {
38                         ret = PTR_ERR(clks[i].clk);
39                         pr_err("%pOF: Failed to get clk index: %d ret: %d\n",
40                                np, i, ret);
41                         clks[i].clk = NULL;
42                         goto err;
43                 }
44         }
45
46         return 0;
47
48 err:
49         clk_bulk_put(i, clks);
50
51         return ret;
52 }
53
54 static int __must_check of_clk_bulk_get_all(struct device_node *np,
55                                             struct clk_bulk_data **clks)
56 {
57         struct clk_bulk_data *clk_bulk;
58         int num_clks;
59         int ret;
60
61         num_clks = of_clk_get_parent_count(np);
62         if (!num_clks)
63                 return 0;
64
65         clk_bulk = kmalloc_array(num_clks, sizeof(*clk_bulk), GFP_KERNEL);
66         if (!clk_bulk)
67                 return -ENOMEM;
68
69         ret = of_clk_bulk_get(np, num_clks, clk_bulk);
70         if (ret) {
71                 kfree(clk_bulk);
72                 return ret;
73         }
74
75         *clks = clk_bulk;
76
77         return num_clks;
78 }
79
80 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
81 {
82         while (--num_clks >= 0) {
83                 clk_put(clks[num_clks].clk);
84                 clks[num_clks].clk = NULL;
85         }
86 }
87 EXPORT_SYMBOL_GPL(clk_bulk_put);
88
89 int __must_check clk_bulk_get(struct device *dev, int num_clks,
90                               struct clk_bulk_data *clks)
91 {
92         int ret;
93         int i;
94
95         for (i = 0; i < num_clks; i++)
96                 clks[i].clk = NULL;
97
98         for (i = 0; i < num_clks; i++) {
99                 clks[i].clk = clk_get(dev, clks[i].id);
100                 if (IS_ERR(clks[i].clk)) {
101                         ret = PTR_ERR(clks[i].clk);
102                         if (ret != -EPROBE_DEFER)
103                                 dev_err(dev, "Failed to get clk '%s': %d\n",
104                                         clks[i].id, ret);
105                         clks[i].clk = NULL;
106                         goto err;
107                 }
108         }
109
110         return 0;
111
112 err:
113         clk_bulk_put(i, clks);
114
115         return ret;
116 }
117 EXPORT_SYMBOL(clk_bulk_get);
118
119 void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks)
120 {
121         if (IS_ERR_OR_NULL(clks))
122                 return;
123
124         clk_bulk_put(num_clks, clks);
125
126         kfree(clks);
127 }
128 EXPORT_SYMBOL(clk_bulk_put_all);
129
130 int __must_check clk_bulk_get_all(struct device *dev,
131                                   struct clk_bulk_data **clks)
132 {
133         struct device_node *np = dev_of_node(dev);
134
135         if (!np)
136                 return 0;
137
138         return of_clk_bulk_get_all(np, clks);
139 }
140 EXPORT_SYMBOL(clk_bulk_get_all);
141
142 #ifdef CONFIG_HAVE_CLK_PREPARE
143
144 /**
145  * clk_bulk_unprepare - undo preparation of a set of clock sources
146  * @num_clks: the number of clk_bulk_data
147  * @clks: the clk_bulk_data table being unprepared
148  *
149  * clk_bulk_unprepare may sleep, which differentiates it from clk_bulk_disable.
150  * Returns 0 on success, -EERROR otherwise.
151  */
152 void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks)
153 {
154         while (--num_clks >= 0)
155                 clk_unprepare(clks[num_clks].clk);
156 }
157 EXPORT_SYMBOL_GPL(clk_bulk_unprepare);
158
159 /**
160  * clk_bulk_prepare - prepare a set of clocks
161  * @num_clks: the number of clk_bulk_data
162  * @clks: the clk_bulk_data table being prepared
163  *
164  * clk_bulk_prepare may sleep, which differentiates it from clk_bulk_enable.
165  * Returns 0 on success, -EERROR otherwise.
166  */
167 int __must_check clk_bulk_prepare(int num_clks,
168                                   const struct clk_bulk_data *clks)
169 {
170         int ret;
171         int i;
172
173         for (i = 0; i < num_clks; i++) {
174                 ret = clk_prepare(clks[i].clk);
175                 if (ret) {
176                         pr_err("Failed to prepare clk '%s': %d\n",
177                                 clks[i].id, ret);
178                         goto err;
179                 }
180         }
181
182         return 0;
183
184 err:
185         clk_bulk_unprepare(i, clks);
186
187         return  ret;
188 }
189 EXPORT_SYMBOL_GPL(clk_bulk_prepare);
190
191 #endif /* CONFIG_HAVE_CLK_PREPARE */
192
193 /**
194  * clk_bulk_disable - gate a set of clocks
195  * @num_clks: the number of clk_bulk_data
196  * @clks: the clk_bulk_data table being gated
197  *
198  * clk_bulk_disable must not sleep, which differentiates it from
199  * clk_bulk_unprepare. clk_bulk_disable must be called before
200  * clk_bulk_unprepare.
201  */
202 void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks)
203 {
204
205         while (--num_clks >= 0)
206                 clk_disable(clks[num_clks].clk);
207 }
208 EXPORT_SYMBOL_GPL(clk_bulk_disable);
209
210 /**
211  * clk_bulk_enable - ungate a set of clocks
212  * @num_clks: the number of clk_bulk_data
213  * @clks: the clk_bulk_data table being ungated
214  *
215  * clk_bulk_enable must not sleep
216  * Returns 0 on success, -EERROR otherwise.
217  */
218 int __must_check clk_bulk_enable(int num_clks, const struct clk_bulk_data *clks)
219 {
220         int ret;
221         int i;
222
223         for (i = 0; i < num_clks; i++) {
224                 ret = clk_enable(clks[i].clk);
225                 if (ret) {
226                         pr_err("Failed to enable clk '%s': %d\n",
227                                 clks[i].id, ret);
228                         goto err;
229                 }
230         }
231
232         return 0;
233
234 err:
235         clk_bulk_disable(i, clks);
236
237         return  ret;
238 }
239 EXPORT_SYMBOL_GPL(clk_bulk_enable);