Merge tag 'perf-core-for-mingo-4.17-20180413' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-microblaze.git] / drivers / clk / clk-devres.c
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License version 2 as
4  * published by the Free Software Foundation.
5  */
6
7 #include <linux/clk.h>
8 #include <linux/device.h>
9 #include <linux/export.h>
10 #include <linux/gfp.h>
11
12 static void devm_clk_release(struct device *dev, void *res)
13 {
14         clk_put(*(struct clk **)res);
15 }
16
17 struct clk *devm_clk_get(struct device *dev, const char *id)
18 {
19         struct clk **ptr, *clk;
20
21         ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
22         if (!ptr)
23                 return ERR_PTR(-ENOMEM);
24
25         clk = clk_get(dev, id);
26         if (!IS_ERR(clk)) {
27                 *ptr = clk;
28                 devres_add(dev, ptr);
29         } else {
30                 devres_free(ptr);
31         }
32
33         return clk;
34 }
35 EXPORT_SYMBOL(devm_clk_get);
36
37 struct clk_bulk_devres {
38         struct clk_bulk_data *clks;
39         int num_clks;
40 };
41
42 static void devm_clk_bulk_release(struct device *dev, void *res)
43 {
44         struct clk_bulk_devres *devres = res;
45
46         clk_bulk_put(devres->num_clks, devres->clks);
47 }
48
49 int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
50                       struct clk_bulk_data *clks)
51 {
52         struct clk_bulk_devres *devres;
53         int ret;
54
55         devres = devres_alloc(devm_clk_bulk_release,
56                               sizeof(*devres), GFP_KERNEL);
57         if (!devres)
58                 return -ENOMEM;
59
60         ret = clk_bulk_get(dev, num_clks, clks);
61         if (!ret) {
62                 devres->clks = clks;
63                 devres->num_clks = num_clks;
64                 devres_add(dev, devres);
65         } else {
66                 devres_free(devres);
67         }
68
69         return ret;
70 }
71 EXPORT_SYMBOL_GPL(devm_clk_bulk_get);
72
73 static int devm_clk_match(struct device *dev, void *res, void *data)
74 {
75         struct clk **c = res;
76         if (!c || !*c) {
77                 WARN_ON(!c || !*c);
78                 return 0;
79         }
80         return *c == data;
81 }
82
83 void devm_clk_put(struct device *dev, struct clk *clk)
84 {
85         int ret;
86
87         ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
88
89         WARN_ON(ret);
90 }
91 EXPORT_SYMBOL(devm_clk_put);
92
93 struct clk *devm_get_clk_from_child(struct device *dev,
94                                     struct device_node *np, const char *con_id)
95 {
96         struct clk **ptr, *clk;
97
98         ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
99         if (!ptr)
100                 return ERR_PTR(-ENOMEM);
101
102         clk = of_clk_get_by_name(np, con_id);
103         if (!IS_ERR(clk)) {
104                 *ptr = clk;
105                 devres_add(dev, ptr);
106         } else {
107                 devres_free(ptr);
108         }
109
110         return clk;
111 }
112 EXPORT_SYMBOL(devm_get_clk_from_child);