LXR linux/arch/powerpc/sysdev/of

   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_address.h>
  15#include <linux/of_platform.h>
  16#include <linux/slab.h>
  17
  18static __initdata struct {
  19        const char *compatible;
  20        char *plat_name;
  21} of_rtc_table[] = {
  22        { "ds1743-nvram", "rtc-ds1742" },
  23};
  24
  25void __init of_instantiate_rtc(void)
  26{
  27        struct device_node *node;
  28        int err;
  29        int i;
  30
  31        for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
  32                char *plat_name = of_rtc_table[i].plat_name;
  33
  34                for_each_compatible_node(node, NULL,
  35                                         of_rtc_table[i].compatible) {
  36                        struct resource *res;
  37
  38                        res = kmalloc(sizeof(*res), GFP_KERNEL);
  39                        if (!res) {
  40                                printk(KERN_ERR "OF RTC: Out of memory "
  41                                       "allocating resource structure for %s\n",
  42                                       node->full_name);
  43                                continue;
  44                        }
  45
  46                        err = of_address_to_resource(node, 0, res);
  47                        if (err) {
  48                                printk(KERN_ERR "OF RTC: Error "
  49                                       "translating resources for %s\n",
  50                                       node->full_name);
  51                                continue;
  52                        }
  53
  54                        printk(KERN_INFO "OF_RTC: %s is a %s @ 0x%llx-0x%llx\n",
  55                               node->full_name, plat_name,
  56                               (unsigned long long)res->start,
  57                               (unsigned long long)res->end);
  58                        platform_device_register_simple(plat_name, -1, res, 1);
  59                }
  60        }
  61}
  62