2 * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com>
3 * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
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.
9 * Fixed rate clock implementation
12 #include <linux/clk-provider.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
16 #include <linux/err.h>
19 * DOC: basic fixed-rate clock that cannot gate
21 * Traits of this clock:
22 * prepare - clk_(un)prepare only ensures parents are prepared
23 * enable - clk_enable only ensures parents are enabled
24 * rate - rate is always a fixed value. No clk_set_rate support
25 * parent - fixed parent. No clk_set_parent support
28 #define to_clk_fixed_rate(_hw) container_of(_hw, struct clk_fixed_rate, hw)
30 static unsigned long clk_fixed_rate_recalc_rate(struct clk_hw
*hw
,
31 unsigned long parent_rate
)
33 return to_clk_fixed_rate(hw
)->fixed_rate
;
35 EXPORT_SYMBOL_GPL(clk_fixed_rate_recalc_rate
);
37 struct clk_ops clk_fixed_rate_ops
= {
38 .recalc_rate
= clk_fixed_rate_recalc_rate
,
40 EXPORT_SYMBOL_GPL(clk_fixed_rate_ops
);
42 struct clk
*clk_register_fixed_rate(struct device
*dev
, const char *name
,
43 const char *parent_name
, unsigned long flags
,
44 unsigned long fixed_rate
)
46 struct clk_fixed_rate
*fixed
;
47 char **parent_names
= NULL
;
50 fixed
= kzalloc(sizeof(struct clk_fixed_rate
), GFP_KERNEL
);
53 pr_err("%s: could not allocate fixed clk\n", __func__
);
54 return ERR_PTR(-ENOMEM
);
57 /* struct clk_fixed_rate assignments */
58 fixed
->fixed_rate
= fixed_rate
;
61 parent_names
= kmalloc(sizeof(char *), GFP_KERNEL
);
66 len
= sizeof(char) * strlen(parent_name
);
68 parent_names
[0] = kmalloc(len
, GFP_KERNEL
);
73 strncpy(parent_names
[0], parent_name
, len
);
77 return clk_register(dev
, name
,
78 &clk_fixed_rate_ops
, &fixed
->hw
,
80 (parent_name
? 1 : 0),