[U-Boot-Users] LIBFDT: first version of fdt_find_compatible_node

[Wolfgang Grandegger <wg@grandegger.com>]

Hello,

attached you can find a patch implementing fdt_find_compatible_node():

/*
  * Find a node based on its device type and one of the tokens in
  * its its "compatible" property. On success, the offset of that
  * node is returned or an error code:
  *
  *   startoffset  - the node to start searching from or 0, the node
  *                  you pass will not be searched, only the next one
  *                  will; typically, you pass 0 to start the search
  *                  and then what the previous call returned.
  *   type         - the device type string to match against
  *   compat       - the string to match to one of the tokens
  *                  in the "compatible" list.
  */

It should be used as shown below:

     offset = 0;
     do {
         offset = fdt_find_compatible_node(fdt, offset, "type", "comp");
     } while (offset >= 0);

This first hack also implements a cached version as alternative, because 
tag re-scanning might take quite long. In principle, the cache could 
also be used for other functions, like fdt_path_offset(), and could be 
invalidated in case the FDT gets updated.

What do you think?

Thanks.

Wolfgang.
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