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
16static __initdata struct {
17 const char *compatible;
18 char *plat_name;
19} of_rtc_table[] = {
20 { "ds1743-nvram", "rtc-ds1742" },
21};
22
23void __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 %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

source code of linux/arch/powerpc/sysdev/of_rtc.c