blob: 153fdac4720f05e29893d2eb4f7f5229539b3a19 [file] [log] [blame]
David Gibson22258fa2008-01-11 14:25:34 +11001/*
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>
Rob Herring26a20562013-09-26 07:40:04 -050014#include <linux/of_address.h>
David Gibson22258fa2008-01-11 14:25:34 +110015#include <linux/of_platform.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
David Gibson22258fa2008-01-11 14:25:34 +110017
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 "
Rob Herringb7c670d2017-08-21 10:16:47 -050041 "allocating resource structure for %pOF\n",
42 node);
David Gibson22258fa2008-01-11 14:25:34 +110043 continue;
44 }
45
46 err = of_address_to_resource(node, 0, res);
47 if (err) {
48 printk(KERN_ERR "OF RTC: Error "
Rob Herringb7c670d2017-08-21 10:16:47 -050049 "translating resources for %pOF\n",
50 node);
David Gibson22258fa2008-01-11 14:25:34 +110051 continue;
52 }
53
Rob Herringb7c670d2017-08-21 10:16:47 -050054 printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n",
55 node, plat_name,
David Gibson22258fa2008-01-11 14:25:34 +110056 (unsigned long long)res->start,
57 (unsigned long long)res->end);
58 platform_device_register_simple(plat_name, -1, res, 1);
59 }
60 }
61}