1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
4 */
5
6 #include <linux/clk-provider.h>
7 #include <linux/slab.h>
8 #include <linux/err.h>
9
10 #include "clk.h"
11
clk_sync_source_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)12 static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw,
13 unsigned long parent_rate)
14 {
15 struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
16
17 return sync->rate;
18 }
19
clk_sync_source_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * prate)20 static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate,
21 unsigned long *prate)
22 {
23 struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
24
25 if (rate > sync->max_rate)
26 return -EINVAL;
27 else
28 return rate;
29 }
30
clk_sync_source_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)31 static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate,
32 unsigned long parent_rate)
33 {
34 struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
35
36 sync->rate = rate;
37 return 0;
38 }
39
40 const struct clk_ops tegra_clk_sync_source_ops = {
41 .round_rate = clk_sync_source_round_rate,
42 .set_rate = clk_sync_source_set_rate,
43 .recalc_rate = clk_sync_source_recalc_rate,
44 };
45
tegra_clk_register_sync_source(const char * name,unsigned long max_rate)46 struct clk *tegra_clk_register_sync_source(const char *name,
47 unsigned long max_rate)
48 {
49 struct tegra_clk_sync_source *sync;
50 struct clk_init_data init;
51 struct clk *clk;
52
53 sync = kzalloc(sizeof(*sync), GFP_KERNEL);
54 if (!sync) {
55 pr_err("%s: could not allocate sync source clk\n", __func__);
56 return ERR_PTR(-ENOMEM);
57 }
58
59 sync->max_rate = max_rate;
60
61 init.ops = &tegra_clk_sync_source_ops;
62 init.name = name;
63 init.flags = 0;
64 init.parent_names = NULL;
65 init.num_parents = 0;
66
67 /* Data in .init is copied by clk_register(), so stack variable OK */
68 sync->hw.init = &init;
69
70 clk = clk_register(NULL, &sync->hw);
71 if (IS_ERR(clk))
72 kfree(sync);
73
74 return clk;
75 }
76