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1f847c65 TK |
1 | /* |
2 | * TI Fixed Factor Clock | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments, Inc. | |
5 | * | |
6 | * Tero Kristo <t-kristo@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
13 | * kind, whether express or implied; without even the implied warranty | |
14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/clk-provider.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/of.h> | |
22 | #include <linux/of_address.h> | |
23 | #include <linux/clk/ti.h> | |
24 | ||
25 | #undef pr_fmt | |
26 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
27 | ||
28 | /** | |
29 | * of_ti_fixed_factor_clk_setup - Setup function for TI fixed factor clock | |
30 | * @node: device node for this clock | |
31 | * | |
32 | * Sets up a simple fixed factor clock based on device tree info. | |
33 | */ | |
34 | static void __init of_ti_fixed_factor_clk_setup(struct device_node *node) | |
35 | { | |
36 | struct clk *clk; | |
37 | const char *clk_name = node->name; | |
38 | const char *parent_name; | |
39 | u32 div, mult; | |
40 | u32 flags = 0; | |
41 | ||
42 | if (of_property_read_u32(node, "ti,clock-div", &div)) { | |
43 | pr_err("%s must have a clock-div property\n", node->name); | |
44 | return; | |
45 | } | |
46 | ||
47 | if (of_property_read_u32(node, "ti,clock-mult", &mult)) { | |
48 | pr_err("%s must have a clock-mult property\n", node->name); | |
49 | return; | |
50 | } | |
51 | ||
52 | if (of_property_read_bool(node, "ti,set-rate-parent")) | |
53 | flags |= CLK_SET_RATE_PARENT; | |
54 | ||
55 | parent_name = of_clk_get_parent_name(node, 0); | |
56 | ||
57 | clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags, | |
58 | mult, div); | |
59 | ||
60 | if (!IS_ERR(clk)) { | |
61 | of_clk_add_provider(node, of_clk_src_simple_get, clk); | |
62 | of_ti_clk_autoidle_setup(node); | |
63 | } | |
64 | } | |
65 | CLK_OF_DECLARE(ti_fixed_factor_clk, "ti,fixed-factor-clock", | |
66 | of_ti_fixed_factor_clk_setup); |