1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Definitions for building a device tree by calling into the
4 * Open Firmware PROM.
5 *
6 * Copyright (C) 2010 Andres Salomon <dilinger@queued.net>
7 */
8
9 #ifndef _LINUX_OF_PDT_H
10 #define _LINUX_OF_PDT_H
11
12 /* overridable operations for calling into the PROM */
13 struct of_pdt_ops {
14 /*
15 * buf should be 32 bytes; return 0 on success.
16 * If prev is NULL, the first property will be returned.
17 */
18 int (*nextprop)(phandle node, char *prev, char *buf);
19
20 /* for both functions, return proplen on success; -1 on error */
21 int (*getproplen)(phandle node, const char *prop);
22 int (*getproperty)(phandle node, const char *prop, char *buf,
23 int bufsize);
24
25 /* phandles are 0 if no child or sibling exists */
26 phandle (*getchild)(phandle parent);
27 phandle (*getsibling)(phandle node);
28
29 /* return 0 on success; fill in 'len' with number of bytes in path */
30 int (*pkg2path)(phandle node, char *buf, const int buflen, int *len);
31 };
32
33 extern void *prom_early_alloc(unsigned long size);
34
35 /* for building the device tree */
36 extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);
37
38 #endif /* _LINUX_OF_PDT_H */