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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#include <linux/slab.h>
14
15static int __set_clk_parents(struct device_node *node, bool clk_supplier)
16{
17 struct of_phandle_args clkspec;
18 int index, rc, num_parents;
19 struct clk *clk, *pclk;
20
21 num_parents = of_count_phandle_with_args(node, "assigned-clock-parents",
22 "#clock-cells");
23 if (num_parents == -EINVAL)
24 pr_err("clk: invalid value of clock-parents property at %pOF\n",
25 node);
26
27 for (index = 0; index < num_parents; index++) {
28 rc = of_parse_phandle_with_args(node, "assigned-clock-parents",
29 "#clock-cells", index, &clkspec);
30 if (rc < 0) {
31 /* skip empty (null) phandles */
32 if (rc == -ENOENT)
33 continue;
34 else
35 return rc;
36 }
37 if (clkspec.np == node && !clk_supplier) {
38 of_node_put(clkspec.np);
39 return 0;
40 }
41 pclk = of_clk_get_from_provider(&clkspec);
42 of_node_put(clkspec.np);
43 if (IS_ERR(pclk)) {
44 if (PTR_ERR(pclk) != -EPROBE_DEFER)
45 pr_warn("clk: couldn't get parent clock %d for %pOF\n",
46 index, node);
47 return PTR_ERR(pclk);
48 }
49
50 rc = of_parse_phandle_with_args(node, "assigned-clocks",
51 "#clock-cells", index, &clkspec);
52 if (rc < 0)
53 goto err;
54 if (clkspec.np == node && !clk_supplier) {
55 of_node_put(clkspec.np);
56 rc = 0;
57 goto err;
58 }
59 clk = of_clk_get_from_provider(&clkspec);
60 of_node_put(clkspec.np);
61 if (IS_ERR(clk)) {
62 if (PTR_ERR(clk) != -EPROBE_DEFER)
63 pr_warn("clk: couldn't get assigned clock %d for %pOF\n",
64 index, node);
65 rc = PTR_ERR(clk);
66 goto err;
67 }
68
69 rc = clk_set_parent(clk, pclk);
70 if (rc < 0)
71 pr_err("clk: failed to reparent %s to %s: %d\n",
72 __clk_get_name(clk), __clk_get_name(pclk), rc);
73 clk_put(clk);
74 clk_put(pclk);
75 }
76 return 0;
77err:
78 clk_put(pclk);
79 return rc;
80}
81
82static int __set_clk_rates(struct device_node *node, bool clk_supplier)
83{
84 struct of_phandle_args clkspec;
85 int rc, count, count_64, index;
86 struct clk *clk;
87 u64 *rates_64 __free(kfree) = NULL;
88 u32 *rates __free(kfree) = NULL;
89
90 count = of_property_count_u32_elems(node, "assigned-clock-rates");
91 count_64 = of_property_count_u64_elems(node, "assigned-clock-rates-u64");
92 if (count_64 > 0) {
93 count = count_64;
94 rates_64 = kcalloc(count, sizeof(*rates_64), GFP_KERNEL);
95 if (!rates_64)
96 return -ENOMEM;
97
98 rc = of_property_read_u64_array(node,
99 "assigned-clock-rates-u64",
100 rates_64, count);
101 } else if (count > 0) {
102 rates = kcalloc(count, sizeof(*rates), GFP_KERNEL);
103 if (!rates)
104 return -ENOMEM;
105
106 rc = of_property_read_u32_array(node, "assigned-clock-rates",
107 rates, count);
108 } else {
109 return 0;
110 }
111
112 if (rc)
113 return rc;
114
115 for (index = 0; index < count; index++) {
116 unsigned long rate;
117
118 if (rates_64)
119 rate = rates_64[index];
120 else
121 rate = rates[index];
122
123 if (rate) {
124 rc = of_parse_phandle_with_args(node, "assigned-clocks",
125 "#clock-cells", index, &clkspec);
126 if (rc < 0) {
127 /* skip empty (null) phandles */
128 if (rc == -ENOENT)
129 continue;
130 else
131 return rc;
132 }
133 if (clkspec.np == node && !clk_supplier) {
134 of_node_put(clkspec.np);
135 return 0;
136 }
137
138 clk = of_clk_get_from_provider(&clkspec);
139 of_node_put(clkspec.np);
140 if (IS_ERR(clk)) {
141 if (PTR_ERR(clk) != -EPROBE_DEFER)
142 pr_warn("clk: couldn't get clock %d for %pOF\n",
143 index, node);
144 return PTR_ERR(clk);
145 }
146
147 rc = clk_set_rate(clk, rate);
148 if (rc < 0)
149 pr_err("clk: couldn't set %s clk rate to %lu (%d), current rate: %lu\n",
150 __clk_get_name(clk), rate, rc,
151 clk_get_rate(clk));
152 clk_put(clk);
153 }
154 }
155 return 0;
156}
157
158/**
159 * of_clk_set_defaults() - parse and set assigned clocks configuration
160 * @node: device node to apply clock settings for
161 * @clk_supplier: true if clocks supplied by @node should also be considered
162 *
163 * This function parses 'assigned-{clocks/clock-parents/clock-rates}' properties
164 * and sets any specified clock parents and rates. The @clk_supplier argument
165 * should be set to true if @node may be also a clock supplier of any clock
166 * listed in its 'assigned-clocks' or 'assigned-clock-parents' properties.
167 * If @clk_supplier is false the function exits returning 0 as soon as it
168 * determines the @node is also a supplier of any of the clocks.
169 */
170int of_clk_set_defaults(struct device_node *node, bool clk_supplier)
171{
172 int rc;
173
174 if (!node)
175 return 0;
176
177 rc = __set_clk_parents(node, clk_supplier);
178 if (rc < 0)
179 return rc;
180
181 return __set_clk_rates(node, clk_supplier);
182}
183EXPORT_SYMBOL_GPL(of_clk_set_defaults);
1/*
2 * Copyright (C) 2014 Samsung Electronics Co., Ltd.
3 * Sylwester Nawrocki <s.nawrocki@samsung.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/clk.h>
11#include <linux/clk-provider.h>
12#include <linux/clk/clk-conf.h>
13#include <linux/device.h>
14#include <linux/of.h>
15#include <linux/printk.h>
16
17static int __set_clk_parents(struct device_node *node, bool clk_supplier)
18{
19 struct of_phandle_args clkspec;
20 int index, rc, num_parents;
21 struct clk *clk, *pclk;
22
23 num_parents = of_count_phandle_with_args(node, "assigned-clock-parents",
24 "#clock-cells");
25 if (num_parents == -EINVAL)
26 pr_err("clk: invalid value of clock-parents property at %pOF\n",
27 node);
28
29 for (index = 0; index < num_parents; index++) {
30 rc = of_parse_phandle_with_args(node, "assigned-clock-parents",
31 "#clock-cells", index, &clkspec);
32 if (rc < 0) {
33 /* skip empty (null) phandles */
34 if (rc == -ENOENT)
35 continue;
36 else
37 return rc;
38 }
39 if (clkspec.np == node && !clk_supplier)
40 return 0;
41 pclk = of_clk_get_from_provider(&clkspec);
42 if (IS_ERR(pclk)) {
43 if (PTR_ERR(pclk) != -EPROBE_DEFER)
44 pr_warn("clk: couldn't get parent clock %d for %pOF\n",
45 index, node);
46 return PTR_ERR(pclk);
47 }
48
49 rc = of_parse_phandle_with_args(node, "assigned-clocks",
50 "#clock-cells", index, &clkspec);
51 if (rc < 0)
52 goto err;
53 if (clkspec.np == node && !clk_supplier) {
54 rc = 0;
55 goto err;
56 }
57 clk = of_clk_get_from_provider(&clkspec);
58 if (IS_ERR(clk)) {
59 if (PTR_ERR(clk) != -EPROBE_DEFER)
60 pr_warn("clk: couldn't get assigned clock %d for %pOF\n",
61 index, node);
62 rc = PTR_ERR(clk);
63 goto err;
64 }
65
66 rc = clk_set_parent(clk, pclk);
67 if (rc < 0)
68 pr_err("clk: failed to reparent %s to %s: %d\n",
69 __clk_get_name(clk), __clk_get_name(pclk), rc);
70 clk_put(clk);
71 clk_put(pclk);
72 }
73 return 0;
74err:
75 clk_put(pclk);
76 return rc;
77}
78
79static int __set_clk_rates(struct device_node *node, bool clk_supplier)
80{
81 struct of_phandle_args clkspec;
82 struct property *prop;
83 const __be32 *cur;
84 int rc, index = 0;
85 struct clk *clk;
86 u32 rate;
87
88 of_property_for_each_u32(node, "assigned-clock-rates", prop, cur, rate) {
89 if (rate) {
90 rc = of_parse_phandle_with_args(node, "assigned-clocks",
91 "#clock-cells", index, &clkspec);
92 if (rc < 0) {
93 /* skip empty (null) phandles */
94 if (rc == -ENOENT)
95 continue;
96 else
97 return rc;
98 }
99 if (clkspec.np == node && !clk_supplier)
100 return 0;
101
102 clk = of_clk_get_from_provider(&clkspec);
103 if (IS_ERR(clk)) {
104 if (PTR_ERR(clk) != -EPROBE_DEFER)
105 pr_warn("clk: couldn't get clock %d for %pOF\n",
106 index, node);
107 return PTR_ERR(clk);
108 }
109
110 rc = clk_set_rate(clk, rate);
111 if (rc < 0)
112 pr_err("clk: couldn't set %s clk rate to %u (%d), current rate: %lu\n",
113 __clk_get_name(clk), rate, rc,
114 clk_get_rate(clk));
115 clk_put(clk);
116 }
117 index++;
118 }
119 return 0;
120}
121
122/**
123 * of_clk_set_defaults() - parse and set assigned clocks configuration
124 * @node: device node to apply clock settings for
125 * @clk_supplier: true if clocks supplied by @node should also be considered
126 *
127 * This function parses 'assigned-{clocks/clock-parents/clock-rates}' properties
128 * and sets any specified clock parents and rates. The @clk_supplier argument
129 * should be set to true if @node may be also a clock supplier of any clock
130 * listed in its 'assigned-clocks' or 'assigned-clock-parents' properties.
131 * If @clk_supplier is false the function exits returning 0 as soon as it
132 * determines the @node is also a supplier of any of the clocks.
133 */
134int of_clk_set_defaults(struct device_node *node, bool clk_supplier)
135{
136 int rc;
137
138 if (!node)
139 return 0;
140
141 rc = __set_clk_parents(node, clk_supplier);
142 if (rc < 0)
143 return rc;
144
145 return __set_clk_rates(node, clk_supplier);
146}
147EXPORT_SYMBOL_GPL(of_clk_set_defaults);