1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
4  */
5 
6 #include <linux/acpi.h>
7 #include <linux/init.h>
8 #include <linux/of.h>
9 #include <linux/clocksource.h>
10 
11 extern struct of_device_id __timer_of_table[];
12 
13 static const struct of_device_id __timer_of_table_sentinel
14 	__used __section(__timer_of_table_end);
15 
16 void __init timer_probe(void)
17 {
18 	struct device_node *np;
19 	const struct of_device_id *match;
20 	of_init_fn_1_ret init_func_ret;
21 	unsigned timers = 0;
22 	int ret;
23 
24 	for_each_matching_node_and_match(np, __timer_of_table, &match) {
25 		if (!of_device_is_available(np))
26 			continue;
27 
28 		init_func_ret = match->data;
29 
30 		ret = init_func_ret(np);
31 		if (ret) {
32 			if (ret != -EPROBE_DEFER)
33 				pr_err("Failed to initialize '%pOF': %d\n", np,
34 				       ret);
35 			continue;
36 		}
37 
38 		timers++;
39 	}
40 
41 	timers += acpi_probe_device_table(timer);
42 
43 	if (!timers)
44 		pr_crit("%s: no matching timers found\n", __func__);
45 }
46