1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/clk/at91/clk-slow.c
4 *
5 * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
6 */
7
8#include <linux/clk-provider.h>
9#include <linux/clkdev.h>
10#include <linux/clk/at91_pmc.h>
11#include <linux/of.h>
12#include <linux/mfd/syscon.h>
13#include <linux/regmap.h>
14
15#include "pmc.h"
16
17struct clk_sam9260_slow {
18 struct clk_hw hw;
19 struct regmap *regmap;
20};
21
22#define to_clk_sam9260_slow(hw) container_of(hw, struct clk_sam9260_slow, hw)
23
24static u8 clk_sam9260_slow_get_parent(struct clk_hw *hw)
25{
26 struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(hw);
27 unsigned int status;
28
29 regmap_read(map: slowck->regmap, AT91_PMC_SR, val: &status);
30
31 return status & AT91_PMC_OSCSEL ? 1 : 0;
32}
33
34static const struct clk_ops sam9260_slow_ops = {
35 .get_parent = clk_sam9260_slow_get_parent,
36};
37
38struct clk_hw * __init
39at91_clk_register_sam9260_slow(struct regmap *regmap,
40 const char *name,
41 const char **parent_names,
42 int num_parents)
43{
44 struct clk_sam9260_slow *slowck;
45 struct clk_hw *hw;
46 struct clk_init_data init;
47 int ret;
48
49 if (!name)
50 return ERR_PTR(error: -EINVAL);
51
52 if (!parent_names || !num_parents)
53 return ERR_PTR(error: -EINVAL);
54
55 slowck = kzalloc(size: sizeof(*slowck), GFP_KERNEL);
56 if (!slowck)
57 return ERR_PTR(error: -ENOMEM);
58
59 init.name = name;
60 init.ops = &sam9260_slow_ops;
61 init.parent_names = parent_names;
62 init.num_parents = num_parents;
63 init.flags = 0;
64
65 slowck->hw.init = &init;
66 slowck->regmap = regmap;
67
68 hw = &slowck->hw;
69 ret = clk_hw_register(NULL, hw: &slowck->hw);
70 if (ret) {
71 kfree(objp: slowck);
72 hw = ERR_PTR(error: ret);
73 }
74
75 return hw;
76}
77

source code of linux/drivers/clk/at91/clk-slow.c