| Wade Farnsworth | 93ab471 | 2007-07-11 02:55:46 +1000 | [diff] [blame^] | 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); |