of_rtc.c

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/*
 * Instantiate mmio-mapped RTC chips based on device tree information
 *
 * Copyright 2007 David Gibson <[email protected]>, 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>
#include <linux/slab.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);
        }
    }
}