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 #include "clock.h"
26
27 #undef pr_fmt
28 #define pr_fmt(fmt) "%s: " fmt, __func__
29
30 /**
31 * of_ti_fixed_factor_clk_setup - Setup function for TI fixed factor clock
32 * @node: device node for this clock
33 *
34 * Sets up a simple fixed factor clock based on device tree info.
35 */
of_ti_fixed_factor_clk_setup(struct device_node * node)36 static void __init of_ti_fixed_factor_clk_setup(struct device_node *node)
37 {
38 struct clk *clk;
39 const char *clk_name = node->name;
40 const char *parent_name;
41 u32 div, mult;
42 u32 flags = 0;
43
44 if (of_property_read_u32(node, "ti,clock-div", &div)) {
45 pr_err("%pOFn must have a clock-div property\n", node);
46 return;
47 }
48
49 if (of_property_read_u32(node, "ti,clock-mult", &mult)) {
50 pr_err("%pOFn must have a clock-mult property\n", node);
51 return;
52 }
53
54 if (of_property_read_bool(node, "ti,set-rate-parent"))
55 flags |= CLK_SET_RATE_PARENT;
56
57 parent_name = of_clk_get_parent_name(node, 0);
58
59 clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags,
60 mult, div);
61
62 if (!IS_ERR(clk)) {
63 of_clk_add_provider(node, of_clk_src_simple_get, clk);
64 of_ti_clk_autoidle_setup(node);
65 ti_clk_add_alias(NULL, clk, clk_name);
66 }
67 }
68 CLK_OF_DECLARE(ti_fixed_factor_clk, "ti,fixed-factor-clock",
69 of_ti_fixed_factor_clk_setup);
70