arch/powerpc/sysdev/of_rtc.c

   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
  18 static __initdata struct {
  19         const char *compatible;
  20         char *plat_name;
  21 } of_rtc_table[] = {
  22         { "ds1743-nvram", "rtc-ds1742" },
  23 };
  24
  25 void __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 %pOF\n",
  42                                        node);
  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 %pOF\n",
  50                                        node);
  51                                 continue;
  52                         }
  53
  54                         printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n",
  55                                node, 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 }