1 /* $NetBSD: fdt_rtc.c,v 1.1 2017/04/22 13:24:20 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared D. McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: fdt_rtc.c,v 1.1 2017/04/22 13:24:20 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/kmem.h>
35
36 #include <libfdt.h>
37 #include <dev/fdt/fdtvar.h>
38
39 int
fdtbus_todr_attach(device_t dev,int phandle,todr_chip_handle_t tch)40 fdtbus_todr_attach(device_t dev, int phandle, todr_chip_handle_t tch)
41 {
42 const char *prop;
43
44 /*
45 * The kernel will only use the first device to register with
46 * todr_attach. If we have an "rtc0" alias, ensure that it matches
47 * this phandle and ignore all other RTC devices.
48 */
49 prop = fdt_get_alias(fdtbus_get_data(), "rtc0");
50 if (prop != NULL && OF_finddevice(prop) != phandle) {
51 device_printf(dev, "disabled\n");
52 return EINVAL;
53 }
54
55 todr_attach(tch);
56
57 return 0;
58 }
59