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
  22 extern struct of_device_id __clksrc_of_table[];
  23 extern struct of_device_id __clksrc_ret_of_table[];
  24
  25 static const struct of_device_id __clksrc_of_table_sentinel
  26         __used __section(__clksrc_of_table_end);
  27
  28 static const struct of_device_id __clksrc_ret_of_table_sentinel
  29         __used __section(__clksrc_ret_of_table_end);
  30
  31 void __init clocksource_probe(void)
  32 {
  33         struct device_node *np;
  34         const struct of_device_id *match;
  35         of_init_fn_1 init_func;
  36         of_init_fn_1_ret init_func_ret;
  37         unsigned clocksources = 0;
  38         int ret;
  39
  40         for_each_matching_node_and_match(np, __clksrc_of_table, &match) {
  41                 if (!of_device_is_available(np))
  42                         continue;
  43
  44                 init_func = match->data;
  45                 init_func(np);
  46                 clocksources++;
  47         }
  48
  49         for_each_matching_node_and_match(np, __clksrc_ret_of_table, &match) {
  50                 if (!of_device_is_available(np))
  51                         continue;
  52
  53                 init_func_ret = match->data;
  54
  55                 ret = init_func_ret(np);
  56                 if (ret) {
  57                         pr_err("Failed to initialize '%s': %d",
  58                                of_node_full_name(np), ret);
  59                         continue;
  60                 }
  61
  62                 clocksources++;
  63         }
  64
  65         clocksources += acpi_probe_device_table(clksrc);
  66
  67         if (!clocksources)
  68                 pr_crit("%s: no matching clocksources found\n", __func__);
  69 }