1/*
 2 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 3 *
 4 * This program is free software; you can redistribute it and/or modify it
 5 * under the terms and conditions of the GNU General Public License,
 6 * version 2, as published by the Free Software Foundation.
 7 *
 8 * This program is distributed in the hope it will be useful, but WITHOUT
 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <linux/acpi.h>
18#include <linux/init.h>
19#include <linux/of.h>
20#include <linux/clocksource.h>
21
22extern struct of_device_id __clksrc_of_table[];
23
24static const struct of_device_id __clksrc_of_table_sentinel
25	__used __section(__clksrc_of_table_end);
26
27void __init clocksource_probe(void)
28{
29	struct device_node *np;
30	const struct of_device_id *match;
31	of_init_fn_1_ret init_func_ret;
32	unsigned clocksources = 0;
33	int ret;
34
35	for_each_matching_node_and_match(np, __clksrc_of_table, &match) {
36		if (!of_device_is_available(np))
37			continue;
38
39		init_func_ret = match->data;
40
41		ret = init_func_ret(np);
42		if (ret) {
43			pr_err("Failed to initialize '%s': %d",
44			       of_node_full_name(np), ret);
45			continue;
46		}
47
48		clocksources++;
49	}
50
51	clocksources += acpi_probe_device_table(clksrc);
52
53	if (!clocksources)
54		pr_crit("%s: no matching clocksources found\n", __func__);
55}