1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Instantiate mmio-mapped RTC chips based on device tree information
4 *
5 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
6 */
7 #include <linux/kernel.h>
8 #include <linux/of.h>
9 #include <linux/init.h>
10 #include <linux/of_address.h>
11 #include <linux/of_platform.h>
12 #include <linux/slab.h>
13
14 static __initdata struct {
15 const char *compatible;
16 char *plat_name;
17 } of_rtc_table[] = {
18 { "ds1743-nvram", "rtc-ds1742" },
19 };
20
of_instantiate_rtc(void)21 void __init of_instantiate_rtc(void)
22 {
23 struct device_node *node;
24 int err;
25 int i;
26
27 for (i = 0; i < ARRAY_SIZE(of_rtc_table); i++) {
28 char *plat_name = of_rtc_table[i].plat_name;
29
30 for_each_compatible_node(node, NULL,
31 of_rtc_table[i].compatible) {
32 struct resource *res;
33
34 res = kmalloc(sizeof(*res), GFP_KERNEL);
35 if (!res) {
36 printk(KERN_ERR "OF RTC: Out of memory "
37 "allocating resource structure for %pOF\n",
38 node);
39 continue;
40 }
41
42 err = of_address_to_resource(node, 0, res);
43 if (err) {
44 printk(KERN_ERR "OF RTC: Error "
45 "translating resources for %pOF\n",
46 node);
47 continue;
48 }
49
50 printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n",
51 node, plat_name,
52 (unsigned long long)res->start,
53 (unsigned long long)res->end);
54 platform_device_register_simple(plat_name, -1, res, 1);
55 }
56 }
57 }
58