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1/*
2 * drivers/clk/at91/clk-slow.c
3 *
4 * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 */
12
13#include <linux/clk-provider.h>
14#include <linux/clkdev.h>
15#include <linux/clk/at91_pmc.h>
16#include <linux/of.h>
17#include <linux/mfd/syscon.h>
18#include <linux/regmap.h>
19
20#include "pmc.h"
21
22struct clk_sam9260_slow {
23 struct clk_hw hw;
24 struct regmap *regmap;
25};
26
27#define to_clk_sam9260_slow(hw) container_of(hw, struct clk_sam9260_slow, hw)
28
29static u8 clk_sam9260_slow_get_parent(struct clk_hw *hw)
30{
31 struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(hw);
32 unsigned int status;
33
34 regmap_read(slowck->regmap, AT91_PMC_SR, &status);
35
36 return status & AT91_PMC_OSCSEL ? 1 : 0;
37}
38
39static const struct clk_ops sam9260_slow_ops = {
40 .get_parent = clk_sam9260_slow_get_parent,
41};
42
43struct clk_hw * __init
44at91_clk_register_sam9260_slow(struct regmap *regmap,
45 const char *name,
46 const char **parent_names,
47 int num_parents)
48{
49 struct clk_sam9260_slow *slowck;
50 struct clk_hw *hw;
51 struct clk_init_data init;
52 int ret;
53
54 if (!name)
55 return ERR_PTR(-EINVAL);
56
57 if (!parent_names || !num_parents)
58 return ERR_PTR(-EINVAL);
59
60 slowck = kzalloc(sizeof(*slowck), GFP_KERNEL);
61 if (!slowck)
62 return ERR_PTR(-ENOMEM);
63
64 init.name = name;
65 init.ops = &sam9260_slow_ops;
66 init.parent_names = parent_names;
67 init.num_parents = num_parents;
68 init.flags = 0;
69
70 slowck->hw.init = &init;
71 slowck->regmap = regmap;
72
73 hw = &slowck->hw;
74 ret = clk_hw_register(NULL, &slowck->hw);
75 if (ret) {
76 kfree(slowck);
77 hw = ERR_PTR(ret);
78 }
79
80 return hw;
81}
82

Warning: That file was not part of the compilation database. It may have many parsing errors.