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/init.h> |
9 | #include <linux/of.h> |
10 | #include <linux/of_address.h> |
11 | #include <linux/platform_device.h> |
12 | #include <linux/slab.h> |
13 | |
14 | #include <asm/prom.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(size: sizeof(*res), GFP_KERNEL); |
37 | if (!res) { |
38 | printk(KERN_ERR "OF RTC: Out of memory " |
39 | "allocating resource structure for %pOF\n" , |
40 | node); |
41 | continue; |
42 | } |
43 | |
44 | err = of_address_to_resource(dev: node, index: 0, r: res); |
45 | if (err) { |
46 | printk(KERN_ERR "OF RTC: Error " |
47 | "translating resources for %pOF\n" , |
48 | node); |
49 | continue; |
50 | } |
51 | |
52 | printk(KERN_INFO "OF_RTC: %pOF is a %s @ 0x%llx-0x%llx\n" , |
53 | node, plat_name, |
54 | (unsigned long long)res->start, |
55 | (unsigned long long)res->end); |
56 | platform_device_register_simple(name: plat_name, id: -1, res, num: 1); |
57 | } |
58 | } |
59 | } |
60 | |