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(slowck->regmap, AT91_PMC_SR, &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(-EINVAL);
51
52	if (!parent_names || !num_parents)
53		return ERR_PTR(-EINVAL);
54
55	slowck = kzalloc(sizeof(*slowck), GFP_KERNEL);
56	if (!slowck)
57		return ERR_PTR(-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, &slowck->hw);
70	if (ret) {
71		kfree(slowck);
72		hw = ERR_PTR(ret);
73	}
74
75	return hw;
76}
77