include/linux/of_pdt.h

   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 extern void (*of_pdt_build_more)(struct device_node *dp);
  39
  40 #endif /* _LINUX_OF_PDT_H */