drivers/clocksource/clkevt-probe.c

   1 /*
   2  * Copyright (c) 2016, Linaro Ltd.  All rights reserved.
   3  * Daniel Lezcano <daniel.lezcano@linaro.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/of.h>
  20 #include <linux/clockchips.h>
  21
  22 extern struct of_device_id __clkevt_of_table[];
  23
  24 static const struct of_device_id __clkevt_of_table_sentinel
  25         __used __section(__clkevt_of_table_end);
  26
  27 int __init clockevent_probe(void)
  28 {
  29         struct device_node *np;
  30         const struct of_device_id *match;
  31         of_init_fn_1_ret init_func;
  32         int ret, clockevents = 0;
  33
  34         for_each_matching_node_and_match(np, __clkevt_of_table, &match) {
  35                 if (!of_device_is_available(np))
  36                         continue;
  37
  38                 init_func = match->data;
  39
  40                 ret = init_func(np);
  41                 if (ret) {
  42                         pr_warn("Failed to initialize '%s' (%d)\n",
  43                                 np->name, ret);
  44                         continue;
  45                 }
  46
  47                 clockevents++;
  48         }
  49
  50         if (!clockevents) {
  51                 pr_crit("%s: no matching clockevent found\n", __func__);
  52                 return -ENODEV;
  53         }
  54
  55         return 0;
  56 }