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of_rtc.c

/*
 * Instantiate mmio-mapped RTC chips based on device tree information
 *
 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/of_platform.h>

static __initdata struct {
      const char *compatible;
      char *plat_name;
} of_rtc_table[] = {
      { "ds1743-nvram", "rtc-ds1742" },
};

void __init of_instantiate_rtc(void)
{
      struct device_node *node;
      int err;
      int i;

      for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
            char *plat_name = of_rtc_table[i].plat_name;

            for_each_compatible_node(node, NULL,
                               of_rtc_table[i].compatible) {
                  struct resource *res;

                  res = kmalloc(sizeof(*res), GFP_KERNEL);
                  if (!res) {
                        printk(KERN_ERR "OF RTC: Out of memory "
                               "allocating resource structure for %s\n",
                               node->full_name);
                        continue;
                  }

                  err = of_address_to_resource(node, 0, res);
                  if (err) {
                        printk(KERN_ERR "OF RTC: Error "
                               "translating resources for %s\n",
                               node->full_name);
                        continue;
                  }

                  printk(KERN_INFO "OF_RTC: %s is a %s @ 0x%llx-0x%llx\n",
                         node->full_name, plat_name,
                         (unsigned long long)res->start,
                         (unsigned long long)res->end);
                  platform_device_register_simple(plat_name, -1, res, 1);
            }
      }
}

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