LXR linux/drivers/clocksource/clksrc-probe.c

   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}
  56