Merge tag 'hwmon-for-v5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / clk / clk-conf.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2014 Samsung Electronics Co., Ltd.
4  * Sylwester Nawrocki <s.nawrocki@samsung.com>
5  */
6
7 #include <linux/clk.h>
8 #include <linux/clk-provider.h>
9 #include <linux/clk/clk-conf.h>
10 #include <linux/device.h>
11 #include <linux/of.h>
12 #include <linux/printk.h>
13
14 static int __set_clk_parents(struct device_node *node, bool clk_supplier)
15 {
16         struct of_phandle_args clkspec;
17         int index, rc, num_parents;
18         struct clk *clk, *pclk;
19
20         num_parents = of_count_phandle_with_args(node, "assigned-clock-parents",
21                                                  "#clock-cells");
22         if (num_parents == -EINVAL)
23                 pr_err("clk: invalid value of clock-parents property at %pOF\n",
24                        node);
25
26         for (index = 0; index < num_parents; index++) {
27                 rc = of_parse_phandle_with_args(node, "assigned-clock-parents",
28                                         "#clock-cells", index, &clkspec);
29                 if (rc < 0) {
30                         /* skip empty (null) phandles */
31                         if (rc == -ENOENT)
32                                 continue;
33                         else
34                                 return rc;
35                 }
36                 if (clkspec.np == node && !clk_supplier)
37                         return 0;
38                 pclk = of_clk_get_from_provider(&clkspec);
39                 if (IS_ERR(pclk)) {
40                         if (PTR_ERR(pclk) != -EPROBE_DEFER)
41                                 pr_warn("clk: couldn't get parent clock %d for %pOF\n",
42                                         index, node);
43                         return PTR_ERR(pclk);
44                 }
45
46                 rc = of_parse_phandle_with_args(node, "assigned-clocks",
47                                         "#clock-cells", index, &clkspec);
48                 if (rc < 0)
49                         goto err;
50                 if (clkspec.np == node && !clk_supplier) {
51                         rc = 0;
52                         goto err;
53                 }
54                 clk = of_clk_get_from_provider(&clkspec);
55                 if (IS_ERR(clk)) {
56                         if (PTR_ERR(clk) != -EPROBE_DEFER)
57                                 pr_warn("clk: couldn't get assigned clock %d for %pOF\n",
58                                         index, node);
59                         rc = PTR_ERR(clk);
60                         goto err;
61                 }
62
63                 rc = clk_set_parent(clk, pclk);
64                 if (rc < 0)
65                         pr_err("clk: failed to reparent %s to %s: %d\n",
66                                __clk_get_name(clk), __clk_get_name(pclk), rc);
67                 clk_put(clk);
68                 clk_put(pclk);
69         }
70         return 0;
71 err:
72         clk_put(pclk);
73         return rc;
74 }
75
76 static int __set_clk_rates(struct device_node *node, bool clk_supplier)
77 {
78         struct of_phandle_args clkspec;
79         struct property *prop;
80         const __be32 *cur;
81         int rc, index = 0;
82         struct clk *clk;
83         u32 rate;
84
85         of_property_for_each_u32(node, "assigned-clock-rates", prop, cur, rate) {
86                 if (rate) {
87                         rc = of_parse_phandle_with_args(node, "assigned-clocks",
88                                         "#clock-cells", index, &clkspec);
89                         if (rc < 0) {
90                                 /* skip empty (null) phandles */
91                                 if (rc == -ENOENT)
92                                         continue;
93                                 else
94                                         return rc;
95                         }
96                         if (clkspec.np == node && !clk_supplier)
97                                 return 0;
98
99                         clk = of_clk_get_from_provider(&clkspec);
100                         if (IS_ERR(clk)) {
101                                 if (PTR_ERR(clk) != -EPROBE_DEFER)
102                                         pr_warn("clk: couldn't get clock %d for %pOF\n",
103                                                 index, node);
104                                 return PTR_ERR(clk);
105                         }
106
107                         rc = clk_set_rate(clk, rate);
108                         if (rc < 0)
109                                 pr_err("clk: couldn't set %s clk rate to %u (%d), current rate: %lu\n",
110                                        __clk_get_name(clk), rate, rc,
111                                        clk_get_rate(clk));
112                         clk_put(clk);
113                 }
114                 index++;
115         }
116         return 0;
117 }
118
119 /**
120  * of_clk_set_defaults() - parse and set assigned clocks configuration
121  * @node: device node to apply clock settings for
122  * @clk_supplier: true if clocks supplied by @node should also be considered
123  *
124  * This function parses 'assigned-{clocks/clock-parents/clock-rates}' properties
125  * and sets any specified clock parents and rates. The @clk_supplier argument
126  * should be set to true if @node may be also a clock supplier of any clock
127  * listed in its 'assigned-clocks' or 'assigned-clock-parents' properties.
128  * If @clk_supplier is false the function exits returning 0 as soon as it
129  * determines the @node is also a supplier of any of the clocks.
130  */
131 int of_clk_set_defaults(struct device_node *node, bool clk_supplier)
132 {
133         int rc;
134
135         if (!node)
136                 return 0;
137
138         rc = __set_clk_parents(node, clk_supplier);
139         if (rc < 0)
140                 return rc;
141
142         return __set_clk_rates(node, clk_supplier);
143 }
144 EXPORT_SYMBOL_GPL(of_clk_set_defaults);