LXR linux/include/linux/of

   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 */
  13struct 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
  33extern void *prom_early_alloc(unsigned long size);
  34
  35/* for building the device tree */
  36extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);
  37
  38#endif /* _LINUX_OF_PDT_H */
  39