drivers/clocksource/timer-probe.c

   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 }