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      1 /*	$NetBSD: fdt_stub.c,v 1.1 2025/09/06 15:44:04 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2025 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  * Stub routines for modular FDT binding functionality referenced from
     34  * common code.  If the real routines are present, these weak aliases are
     35  * overridden by the linker.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: fdt_stub.c,v 1.1 2025/09/06 15:44:04 thorpej Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/bus.h>
     43 
     44 #include <libfdt.h>
     45 #include <dev/fdt/fdtvar.h>
     46 
     47 bus_dma_tag_t	fdtbus_iommu_map_nullop(int, u_int, bus_dma_tag_t);
     48 
     49 bus_dma_tag_t
     50 fdtbus_iommu_map_nullop(int phandle __unused, u_int index __unused,
     51     bus_dma_tag_t dmat)
     52 {
     53 	return dmat;
     54 }
     55 __weak_alias(fdtbus_iommu_map, fdtbus_iommu_map_nullop);
     56 
     57 /* Must be in the same compilation unit, sigh. */
     58 int	fdtbus_nullop(void);
     59 
     60 int
     61 fdtbus_nullop(void)
     62 {
     63 	return 0;
     64 }
     65 
     66 __weak_alias(fdtbus_pinctrl_set_config, fdtbus_nullop);
     67 __weak_alias(fdtbus_pinctrl_has_config, fdtbus_nullop);
     68 
     69 __weak_alias(fdtbus_power_reset, fdtbus_nullop);
     70 __weak_alias(fdtbus_power_poweroff, fdtbus_nullop);
     71 
     72 __weak_alias(fdtbus_powerdomain_enable_index, fdtbus_nullop);
     73 __weak_alias(fdtbus_powerdomain_disable_index, fdtbus_nullop);
     74 __weak_alias(fdtbus_powerdomain_enable, fdtbus_nullop);
     75 __weak_alias(fdtbus_powerdomain_disable, fdtbus_nullop);
     76