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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/clk/clk-conf.c
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>
17 static int __set_clk_parents(struct device_node
*node
, bool clk_supplier
)
19 struct of_phandle_args clkspec
;
20 int index
, rc
, num_parents
;
21 struct clk
*clk
, *pclk
;
23 num_parents
= of_count_phandle_with_args(node
, "assigned-clock-parents",
25 if (num_parents
== -EINVAL
)
26 pr_err("clk: invalid value of clock-parents property at %s\n",
29 for (index
= 0; index
< num_parents
; index
++) {
30 rc
= of_parse_phandle_with_args(node
, "assigned-clock-parents",
31 "#clock-cells", index
, &clkspec
);
33 /* skip empty (null) phandles */
39 if (clkspec
.np
== node
&& !clk_supplier
)
41 pclk
= of_clk_get_from_provider(&clkspec
);
43 pr_warn("clk: couldn't get parent clock %d for %s\n",
44 index
, node
->full_name
);
48 rc
= of_parse_phandle_with_args(node
, "assigned-clocks",
49 "#clock-cells", index
, &clkspec
);
52 if (clkspec
.np
== node
&& !clk_supplier
) {
56 clk
= of_clk_get_from_provider(&clkspec
);
58 pr_warn("clk: couldn't get parent clock %d for %s\n",
59 index
, node
->full_name
);
64 rc
= clk_set_parent(clk
, pclk
);
66 pr_err("clk: failed to reparent %s to %s: %d\n",
67 __clk_get_name(clk
), __clk_get_name(pclk
), rc
);
77 static int __set_clk_rates(struct device_node
*node
, bool clk_supplier
)
79 struct of_phandle_args clkspec
;
80 struct property
*prop
;
86 of_property_for_each_u32(node
, "assigned-clock-rates", prop
, cur
, rate
) {
88 rc
= of_parse_phandle_with_args(node
, "assigned-clocks",
89 "#clock-cells", index
, &clkspec
);
91 /* skip empty (null) phandles */
97 if (clkspec
.np
== node
&& !clk_supplier
)
100 clk
= of_clk_get_from_provider(&clkspec
);
102 pr_warn("clk: couldn't get clock %d for %s\n",
103 index
, node
->full_name
);
107 rc
= clk_set_rate(clk
, rate
);
109 pr_err("clk: couldn't set %s clk rate to %d (%d), current rate: %ld\n",
110 __clk_get_name(clk
), rate
, 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 returning 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
);