linux/arch/powerpc/sysdev/of_rtc.c
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   1/*
   2 * Instantiate mmio-mapped RTC chips based on device tree information
   3 *
   4 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
   5 *
   6 * This program is free software; you can redistribute  it and/or modify it
   7 * under  the terms of  the GNU General  Public License as published by the
   8 * Free Software Foundation;  either version 2 of the  License, or (at your
   9 * option) any later version.
  10 */
  11#include <linux/kernel.h>
  12#include <linux/of.h>
  13#include <linux/init.h>
  14#include <linux/of_platform.h>
  15#include <linux/slab.h>
  16
  17static __initdata struct {
  18        const char *compatible;
  19        char *plat_name;
  20} of_rtc_table[] = {
  21        { "ds1743-nvram", "rtc-ds1742" },
  22};
  23
  24void __init of_instantiate_rtc(void)
  25{
  26        struct device_node *node;
  27        int err;
  28        int i;
  29
  30        for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
  31                char *plat_name = of_rtc_table[i].plat_name;
  32
  33                for_each_compatible_node(node, NULL,
  34                                         of_rtc_table[i].compatible) {
  35                        struct resource *res;
  36
  37                        res = kmalloc(sizeof(*res), GFP_KERNEL);
  38                        if (!res) {
  39                                printk(KERN_ERR "OF RTC: Out of memory "
  40                                       "allocating resource structure for %s\n",
  41                                       node->full_name);
  42                                continue;
  43                        }
  44
  45                        err = of_address_to_resource(node, 0, res);
  46                        if (err) {
  47                                printk(KERN_ERR "OF RTC: Error "
  48                                       "translating resources for %s\n",
  49                                       node->full_name);
  50                                continue;
  51                        }
  52
  53                        printk(KERN_INFO "OF_RTC: %s is a %s @ 0x%llx-0x%llx\n",
  54                               node->full_name, plat_name,
  55                               (unsigned long long)res->start,
  56                               (unsigned long long)res->end);
  57                        platform_device_register_simple(plat_name, -1, res, 1);
  58                }
  59        }
  60}
  61