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      1 $NetBSD: device_calls,v 1.2 2025/09/08 00:12:21 thorpej Exp $
      2 
      3 /*-
      4  * Copyright (c) 2021 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Device calls used by the device autoconfiguration subsystem
     34  */
     35 
     36 subsystem device;
     37 
     38 /*
     39  * device-enumerate-children
     40  *
     41  * Enumerates the direct children of a device, invoking the callback for
     42  * each one.  The callback is passed the devhandle_t corresponding to the
     43  * child device, as well as a user-supplied argument.  If the callback
     44  * returns true, then enumeration continues.  If the callback returns false,
     45  * enumeration is stopped.
     46  */
     47 device-enumerate-children {
     48 	bool	(*callback)(device_t, devhandle_t, void *);
     49 	void *	callback_arg;
     50 };
     51 
     52 /*
     53  * device-is-system-todr
     54  *
     55  * This is a filter that is considered when attaching the system TODR / RTC.
     56  * For systems which may have multiple TODR / RTC devices, the platform
     57  * device tree may have information about which is authoritative.  This is
     58  * an optional method, and in its absence, the system will proceed as if
     59  * the answer was "yes".
     60  */
     61 device-is-system-todr {
     62 	bool	result;		/* OUT */
     63 };
     64