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 */ 39