[POWERPC] Enable RTC for Ebony and Walnut (v2)
[linux-3.10.git] / 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_platform.h>
15
16 static __initdata struct {
17         const char *compatible;
18         char *plat_name;
19 } of_rtc_table[] = {
20         { "ds1743-nvram", "rtc-ds1742" },
21 };
22
23 void __init of_instantiate_rtc(void)
24 {
25         struct device_node *node;
26         int err;
27         int i;
28
29         for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
30                 char *plat_name = of_rtc_table[i].plat_name;
31
32                 for_each_compatible_node(node, NULL,
33                                          of_rtc_table[i].compatible) {
34                         struct resource *res;
35
36                         res = kmalloc(sizeof(*res), GFP_KERNEL);
37                         if (!res) {
38                                 printk(KERN_ERR "OF RTC: Out of memory "
39                                        "allocating resource structure for %s\n",
40                                        node->full_name);
41                                 continue;
42                         }
43
44                         err = of_address_to_resource(node, 0, res);
45                         if (err) {
46                                 printk(KERN_ERR "OF RTC: Error "
47                                        "translating resources for %s\n",
48                                        node->full_name);
49                                 continue;
50                         }
51
52                         printk(KERN_INFO "OF_RTC: %s is a %s @ 0x%llx-0x%llx\n",
53                                node->full_name, plat_name,
54                                (unsigned long long)res->start,
55                                (unsigned long long)res->end);
56                         platform_device_register_simple(plat_name, -1, res, 1);
57                 }
58         }
59 }