xref: /openbmc/linux/drivers/clk/ti/clockdomain.c (revision d7a3d85e)
1 /*
2  * OMAP clockdomain support
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/of.h>
21 #include <linux/of_address.h>
22 #include <linux/clk/ti.h>
23 
24 #undef pr_fmt
25 #define pr_fmt(fmt) "%s: " fmt, __func__
26 
27 static void __init of_ti_clockdomain_setup(struct device_node *node)
28 {
29 	struct clk *clk;
30 	struct clk_hw *clk_hw;
31 	const char *clkdm_name = node->name;
32 	int i;
33 	int num_clks;
34 
35 	num_clks = of_count_phandle_with_args(node, "clocks", "#clock-cells");
36 
37 	for (i = 0; i < num_clks; i++) {
38 		clk = of_clk_get(node, i);
39 		if (IS_ERR(clk)) {
40 			pr_err("%s: Failed get %s' clock nr %d (%ld)\n",
41 			       __func__, node->full_name, i, PTR_ERR(clk));
42 			continue;
43 		}
44 		if (__clk_get_flags(clk) & CLK_IS_BASIC) {
45 			pr_warn("can't setup clkdm for basic clk %s\n",
46 				__clk_get_name(clk));
47 			continue;
48 		}
49 		clk_hw = __clk_get_hw(clk);
50 		to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name;
51 		omap2_init_clk_clkdm(clk_hw);
52 	}
53 }
54 
55 static const struct of_device_id ti_clkdm_match_table[] __initconst = {
56 	{ .compatible = "ti,clockdomain" },
57 	{ }
58 };
59 
60 /**
61  * ti_dt_clockdomains_setup - setup device tree clockdomains
62  *
63  * Initializes clockdomain nodes for a SoC. This parses through all the
64  * nodes with compatible = "ti,clockdomain", and add the clockdomain
65  * info for all the clocks listed under these. This function shall be
66  * called after rest of the DT clock init has completed and all
67  * clock nodes have been registered.
68  */
69 void __init ti_dt_clockdomains_setup(void)
70 {
71 	struct device_node *np;
72 	for_each_matching_node(np, ti_clkdm_match_table) {
73 		of_ti_clockdomain_setup(np);
74 	}
75 }
76