1 1.3 thorpej /* $NetBSD: fdt_rtc.c,v 1.3 2025/09/08 13:06:16 thorpej Exp $ */ 2 1.1 jmcneill 3 1.1 jmcneill /*- 4 1.1 jmcneill * Copyright (c) 2017 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.1 jmcneill * All rights reserved. 6 1.1 jmcneill * 7 1.1 jmcneill * Redistribution and use in source and binary forms, with or without 8 1.1 jmcneill * modification, are permitted provided that the following conditions 9 1.1 jmcneill * are met: 10 1.1 jmcneill * 1. Redistributions of source code must retain the above copyright 11 1.1 jmcneill * notice, this list of conditions and the following disclaimer. 12 1.1 jmcneill * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 jmcneill * notice, this list of conditions and the following disclaimer in the 14 1.1 jmcneill * documentation and/or other materials provided with the distribution. 15 1.1 jmcneill * 16 1.1 jmcneill * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1 jmcneill * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1 jmcneill * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1 jmcneill * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1 jmcneill * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.1 jmcneill * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.1 jmcneill * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.1 jmcneill * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.1 jmcneill * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1 jmcneill * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1 jmcneill * SUCH DAMAGE. 27 1.1 jmcneill */ 28 1.1 jmcneill 29 1.1 jmcneill #include <sys/cdefs.h> 30 1.3 thorpej __KERNEL_RCSID(0, "$NetBSD: fdt_rtc.c,v 1.3 2025/09/08 13:06:16 thorpej Exp $"); 31 1.1 jmcneill 32 1.1 jmcneill #include <sys/param.h> 33 1.1 jmcneill #include <sys/bus.h> 34 1.2 thorpej #include <sys/device_calls.h> 35 1.1 jmcneill 36 1.1 jmcneill #include <libfdt.h> 37 1.1 jmcneill #include <dev/fdt/fdtvar.h> 38 1.2 thorpej #include <dev/ofw/openfirm.h> 39 1.1 jmcneill 40 1.2 thorpej static int 41 1.2 thorpej fdtbus_device_is_system_todr(device_t dev, devhandle_t call_handle, void *v) 42 1.2 thorpej { 43 1.2 thorpej struct device_is_system_todr_args *args = v; 44 1.2 thorpej int phandle = devhandle_to_of(call_handle); 45 1.2 thorpej const char *prop; 46 1.2 thorpej 47 1.2 thorpej /* 48 1.2 thorpej * The kernel will only use the first device to register with 49 1.2 thorpej * todr_attach. If we have an "rtc0" alias, ensure that it matches 50 1.2 thorpej * this phandle and ignore all other RTC devices. 51 1.2 thorpej */ 52 1.2 thorpej prop = fdt_get_alias(fdtbus_get_data(), "rtc0"); 53 1.2 thorpej if (prop == NULL) { 54 1.2 thorpej /* No "rtc0" alias. System gets default policy. */ 55 1.2 thorpej return ESRCH; 56 1.2 thorpej } 57 1.2 thorpej args->result = OF_finddevice(prop) == phandle; 58 1.2 thorpej return 0; 59 1.2 thorpej } 60 1.2 thorpej 61 1.2 thorpej OF_DEVICE_CALL_REGISTER(DEVICE_IS_SYSTEM_TODR_STR, 62 1.2 thorpej fdtbus_device_is_system_todr) 63
Indexes created Sun Sep 21 15:09:59 GMT 2025