2 * Copyright (C) 2014 Samsung Electronics Co., Ltd.
3 * Sylwester Nawrocki <s.nawrocki@samsung.com>
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.
10 #include <linux/clk.h>
11 #include <linux/clk-provider.h>
12 #include <linux/clk/clk-conf.h>
13 #include <linux/device.h>
15 #include <linux/printk.h>
18 static int __set_clk_parents(struct device_node *node, bool clk_supplier)
20 struct of_phandle_args clkspec;
21 int index, rc, num_parents;
22 struct clk *clk, *pclk;
24 num_parents = of_count_phandle_with_args(node, "assigned-clock-parents",
26 if (num_parents == -EINVAL)
27 pr_err("clk: invalid value of clock-parents property at %s\n",
30 for (index = 0; index < num_parents; index++) {
31 rc = of_parse_phandle_with_args(node, "assigned-clock-parents",
32 "#clock-cells", index, &clkspec);
34 /* skip empty (null) phandles */
40 if (clkspec.np == node && !clk_supplier)
42 pclk = of_clk_get_by_clkspec(&clkspec);
44 pr_warn("clk: couldn't get parent clock %d for %s\n",
45 index, node->full_name);
49 rc = of_parse_phandle_with_args(node, "assigned-clocks",
50 "#clock-cells", index, &clkspec);
53 if (clkspec.np == node && !clk_supplier) {
57 clk = of_clk_get_by_clkspec(&clkspec);
59 pr_warn("clk: couldn't get parent clock %d for %s\n",
60 index, node->full_name);
65 rc = clk_set_parent(clk, pclk);
67 pr_err("clk: failed to reparent %s to %s: %d\n",
68 __clk_get_name(clk), __clk_get_name(pclk), rc);
78 static int __set_clk_rates(struct device_node *node, bool clk_supplier)
80 struct of_phandle_args clkspec;
81 struct property *prop;
87 of_property_for_each_u32(node, "assigned-clock-rates", prop, cur, rate) {
89 rc = of_parse_phandle_with_args(node, "assigned-clocks",
90 "#clock-cells", index, &clkspec);
92 /* skip empty (null) phandles */
98 if (clkspec.np == node && !clk_supplier)
101 clk = of_clk_get_by_clkspec(&clkspec);
103 pr_warn("clk: couldn't get clock %d for %s\n",
104 index, node->full_name);
108 rc = clk_set_rate(clk, rate);
110 pr_err("clk: couldn't set %s clock rate: %d\n",
111 __clk_get_name(clk), rc);
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
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 returnning 0 as soon as it
129 * determines the @node is also a supplier of any of the clocks.
131 int of_clk_set_defaults(struct device_node *node, bool clk_supplier)
138 rc = __set_clk_parents(node, clk_supplier);
142 return __set_clk_rates(node, clk_supplier);
144 EXPORT_SYMBOL_GPL(of_clk_set_defaults);