linux/include/linux/of_pdt.h
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   1/*
   2 * Definitions for building a device tree by calling into the
   3 * Open Firmware PROM.
   4 *
   5 * Copyright (C) 2010  Andres Salomon <dilinger@queued.net>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * as published by the Free Software Foundation; either version
  10 * 2 of the License, or (at your option) any later version.
  11 */
  12
  13#ifndef _LINUX_OF_PDT_H
  14#define _LINUX_OF_PDT_H
  15
  16/* overridable operations for calling into the PROM */
  17struct of_pdt_ops {
  18        /*
  19         * buf should be 32 bytes; return 0 on success.
  20         * If prev is NULL, the first property will be returned.
  21         */
  22        int (*nextprop)(phandle node, char *prev, char *buf);
  23
  24        /* for both functions, return proplen on success; -1 on error */
  25        int (*getproplen)(phandle node, const char *prop);
  26        int (*getproperty)(phandle node, const char *prop, char *buf,
  27                        int bufsize);
  28
  29        /* phandles are 0 if no child or sibling exists */
  30        phandle (*getchild)(phandle parent);
  31        phandle (*getsibling)(phandle node);
  32
  33        /* return 0 on success; fill in 'len' with number of bytes in path */
  34        int (*pkg2path)(phandle node, char *buf, const int buflen, int *len);
  35};
  36
  37extern void *prom_early_alloc(unsigned long size);
  38
  39/* for building the device tree */
  40extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);
  41
  42extern void (*of_pdt_build_more)(struct device_node *dp,
  43                struct device_node ***nextp);
  44
  45#endif /* _LINUX_OF_PDT_H */
  46
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