LXR linux/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
  11extern struct of_device_id __timer_of_table[];
  12
  13static const struct of_device_id __timer_of_table_sentinel
  14        __used __section("__timer_of_table_end");
  15
  16void __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