device_tree.h

   1 /*
   2  * Header with function prototypes to help device tree manipulation using
   3  * libfdt. It also provides functions to read entries from device tree proc
   4  * interface.
   5  *
   6  * Copyright 2008 IBM Corporation.
   7  * Authors: Jerone Young <jyoung5@us.ibm.com>
   8  *          Hollis Blanchard <hollisb@us.ibm.com>
   9  *
  10  * This work is licensed under the GNU GPL license version 2 or later.
  11  *
  12  */
  13
  14 #ifndef __DEVICE_TREE_H__
  15 #define __DEVICE_TREE_H__
  16
  17 void *load_device_tree(const char *filename_path, int *sizep);
  18
  19 int qemu_devtree_setprop(void *fdt, const char *node_path,
  20                          const char *property, void *val_array, int size);
  21 int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
  22                               const char *property, uint32_t val);
  23 int qemu_devtree_setprop_string(void *fdt, const char *node_path,
  24                                 const char *property, const char *string);
  25 int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
  26                                  const char *property,
  27                                  const char *target_node_path);
  28 int qemu_devtree_nop_node(void *fdt, const char *node_path);
  29 int qemu_devtree_add_subnode(void *fdt, const char *name);
  30
  31 #define qemu_devtree_setprop_cells(fdt, node_path, property, ...)             \
  32     do {                                                                      \
  33         uint32_t qdt_tmp[] = { __VA_ARGS__ };                                 \
  34         int i;                                                                \
  35                                                                               \
  36         for (i = 0; i < ARRAY_SIZE(qdt_tmp); i++) {                           \
  37             qdt_tmp[i] = cpu_to_be32(qdt_tmp[i]);                             \
  38         }                                                                     \
  39         qemu_devtree_setprop(fdt, node_path, property, qdt_tmp,               \
  40                              sizeof(qdt_tmp));                                \
  41     } while (0)
  42
  43 #endif /* __DEVICE_TREE_H__ */