1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TI Fixed Factor Clock
4 *
5 * Copyright (C) 2013 Texas Instruments, Inc.
6 *
7 * Tero Kristo <t-kristo@ti.com>
8 */
9
10 #include <linux/clk-provider.h>
11 #include <linux/slab.h>
12 #include <linux/err.h>
13 #include <linux/of.h>
14 #include <linux/of_address.h>
15 #include <linux/clk/ti.h>
16
17 #include "clock.h"
18
19 #undef pr_fmt
20 #define pr_fmt(fmt) "%s: " fmt, __func__
21
22 /**
23 * of_ti_fixed_factor_clk_setup - Setup function for TI fixed factor clock
24 * @node: device node for this clock
25 *
26 * Sets up a simple fixed factor clock based on device tree info.
27 */
of_ti_fixed_factor_clk_setup(struct device_node * node)28 static void __init of_ti_fixed_factor_clk_setup(struct device_node *node)
29 {
30 struct clk *clk;
31 const char *clk_name = ti_dt_clk_name(node);
32 const char *parent_name;
33 u32 div, mult;
34 u32 flags = 0;
35
36 if (of_property_read_u32(node, "ti,clock-div", &div)) {
37 pr_err("%pOFn must have a clock-div property\n", node);
38 return;
39 }
40
41 if (of_property_read_u32(node, "ti,clock-mult", &mult)) {
42 pr_err("%pOFn must have a clock-mult property\n", node);
43 return;
44 }
45
46 if (of_property_read_bool(node, "ti,set-rate-parent"))
47 flags |= CLK_SET_RATE_PARENT;
48
49 parent_name = of_clk_get_parent_name(node, 0);
50
51 clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags,
52 mult, div);
53
54 if (!IS_ERR(clk)) {
55 of_clk_add_provider(node, of_clk_src_simple_get, clk);
56 of_ti_clk_autoidle_setup(node);
57 ti_clk_add_alias(clk, clk_name);
58 }
59 }
60 CLK_OF_DECLARE(ti_fixed_factor_clk, "ti,fixed-factor-clock",
61 of_ti_fixed_factor_clk_setup);
62