]> git.sur5r.net Git - u-boot/blob - drivers/clk/clk-uclass.c
clk: refactor clk_get_by_index() into clk_get_by_indexed_prop()
[u-boot] / drivers / clk / clk-uclass.c
1 /*
2  * Copyright (C) 2015 Google, Inc
3  * Written by Simon Glass <sjg@chromium.org>
4  * Copyright (c) 2016, NVIDIA CORPORATION.
5  *
6  * SPDX-License-Identifier:     GPL-2.0+
7  */
8
9 #include <common.h>
10 #include <clk.h>
11 #include <clk-uclass.h>
12 #include <dm.h>
13 #include <dt-structs.h>
14 #include <errno.h>
15
16 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
17 {
18         return (const struct clk_ops *)dev->driver->ops;
19 }
20
21 #if CONFIG_IS_ENABLED(OF_CONTROL)
22 # if CONFIG_IS_ENABLED(OF_PLATDATA)
23 int clk_get_by_index_platdata(struct udevice *dev, int index,
24                               struct phandle_1_arg *cells, struct clk *clk)
25 {
26         int ret;
27
28         if (index != 0)
29                 return -ENOSYS;
30         ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
31         if (ret)
32                 return ret;
33         clk->id = cells[0].arg[0];
34
35         return 0;
36 }
37 # else
38 static int clk_of_xlate_default(struct clk *clk,
39                                 struct ofnode_phandle_args *args)
40 {
41         debug("%s(clk=%p)\n", __func__, clk);
42
43         if (args->args_count > 1) {
44                 debug("Invaild args_count: %d\n", args->args_count);
45                 return -EINVAL;
46         }
47
48         if (args->args_count)
49                 clk->id = args->args[0];
50         else
51                 clk->id = 0;
52
53         return 0;
54 }
55
56 static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
57                                    int index, struct clk *clk)
58 {
59         int ret;
60         struct ofnode_phandle_args args;
61         struct udevice *dev_clk;
62         const struct clk_ops *ops;
63
64         debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
65
66         assert(clk);
67         clk->dev = NULL;
68
69         ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
70                                          index, &args);
71         if (ret) {
72                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
73                       __func__, ret);
74                 return ret;
75         }
76
77         ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
78         if (ret) {
79                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
80                       __func__, ret);
81                 return ret;
82         }
83
84         clk->dev = dev_clk;
85
86         ops = clk_dev_ops(dev_clk);
87
88         if (ops->of_xlate)
89                 ret = ops->of_xlate(clk, &args);
90         else
91                 ret = clk_of_xlate_default(clk, &args);
92         if (ret) {
93                 debug("of_xlate() failed: %d\n", ret);
94                 return ret;
95         }
96
97         return clk_request(dev_clk, clk);
98 }
99
100 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
101 {
102         return clk_get_by_indexed_prop(dev, "clocks", index, clk);
103 }
104 # endif /* OF_PLATDATA */
105
106 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
107 {
108         int index;
109
110         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
111         clk->dev = NULL;
112
113         index = dev_read_stringlist_search(dev, "clock-names", name);
114         if (index < 0) {
115                 debug("fdt_stringlist_search() failed: %d\n", index);
116                 return index;
117         }
118
119         return clk_get_by_index(dev, index, clk);
120 }
121
122 int clk_release_all(struct clk *clk, int count)
123 {
124         int i, ret;
125
126         for (i = 0; i < count; i++) {
127                 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
128
129                 /* check if clock has been previously requested */
130                 if (!clk[i].dev)
131                         continue;
132
133                 ret = clk_disable(&clk[i]);
134                 if (ret && ret != -ENOSYS)
135                         return ret;
136
137                 ret = clk_free(&clk[i]);
138                 if (ret && ret != -ENOSYS)
139                         return ret;
140         }
141
142         return 0;
143 }
144
145 #endif /* OF_CONTROL */
146
147 int clk_request(struct udevice *dev, struct clk *clk)
148 {
149         const struct clk_ops *ops = clk_dev_ops(dev);
150
151         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
152
153         clk->dev = dev;
154
155         if (!ops->request)
156                 return 0;
157
158         return ops->request(clk);
159 }
160
161 int clk_free(struct clk *clk)
162 {
163         const struct clk_ops *ops = clk_dev_ops(clk->dev);
164
165         debug("%s(clk=%p)\n", __func__, clk);
166
167         if (!ops->free)
168                 return 0;
169
170         return ops->free(clk);
171 }
172
173 ulong clk_get_rate(struct clk *clk)
174 {
175         const struct clk_ops *ops = clk_dev_ops(clk->dev);
176
177         debug("%s(clk=%p)\n", __func__, clk);
178
179         if (!ops->get_rate)
180                 return -ENOSYS;
181
182         return ops->get_rate(clk);
183 }
184
185 ulong clk_set_rate(struct clk *clk, ulong rate)
186 {
187         const struct clk_ops *ops = clk_dev_ops(clk->dev);
188
189         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
190
191         if (!ops->set_rate)
192                 return -ENOSYS;
193
194         return ops->set_rate(clk, rate);
195 }
196
197 int clk_set_parent(struct clk *clk, struct clk *parent)
198 {
199         const struct clk_ops *ops = clk_dev_ops(clk->dev);
200
201         debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
202
203         if (!ops->set_parent)
204                 return -ENOSYS;
205
206         return ops->set_parent(clk, parent);
207 }
208
209 int clk_enable(struct clk *clk)
210 {
211         const struct clk_ops *ops = clk_dev_ops(clk->dev);
212
213         debug("%s(clk=%p)\n", __func__, clk);
214
215         if (!ops->enable)
216                 return -ENOSYS;
217
218         return ops->enable(clk);
219 }
220
221 int clk_disable(struct clk *clk)
222 {
223         const struct clk_ops *ops = clk_dev_ops(clk->dev);
224
225         debug("%s(clk=%p)\n", __func__, clk);
226
227         if (!ops->disable)
228                 return -ENOSYS;
229
230         return ops->disable(clk);
231 }
232
233 UCLASS_DRIVER(clk) = {
234         .id             = UCLASS_CLK,
235         .name           = "clk",
236 };