Commit | Line | Data |
---|---|---|
93ab4718 WF |
1 | /* |
2 | * Setup code for PC-style Real-Time Clock. | |
3 | * | |
4 | * Author: Wade Farnsworth <wfarnsworth@mvista.com> | |
5 | * | |
6 | * 2007 (c) MontaVista Software, Inc. This file is licensed under | |
7 | * the terms of the GNU General Public License version 2. This program | |
8 | * is licensed "as is" without any warranty of any kind, whether express | |
9 | * or implied. | |
10 | */ | |
11 | ||
12 | #include <linux/platform_device.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/mc146818rtc.h> | |
16 | ||
17 | #include <asm/prom.h> | |
18 | ||
19 | static int __init add_rtc(void) | |
20 | { | |
21 | struct device_node *np; | |
22 | struct platform_device *pd; | |
23 | struct resource res; | |
24 | int ret; | |
25 | ||
26 | np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00"); | |
27 | if (!np) | |
28 | return -ENODEV; | |
29 | ||
30 | ret = of_address_to_resource(np, 0, &res); | |
31 | of_node_put(np); | |
32 | if (ret) | |
33 | return ret; | |
34 | ||
35 | /* | |
36 | * RTC_PORT(x) is hardcoded in asm/mc146818rtc.h. Verify that the | |
37 | * address provided by the device node matches. | |
38 | */ | |
39 | if (res.start != RTC_PORT(0)) | |
40 | return -EINVAL; | |
41 | ||
42 | pd = platform_device_register_simple("rtc_cmos", -1, | |
43 | &res, 1); | |
44 | if (IS_ERR(pd)) | |
45 | return PTR_ERR(pd); | |
46 | ||
47 | return 0; | |
48 | } | |
49 | fs_initcall(add_rtc); |