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libfdt_internal.h

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    • David Gibson's avatar
      d1c63148
      libfdt: Implement property iteration functions · d1c63148
      David Gibson authored
      
      For ages, we've been talking about adding functions to libfdt to allow
      iteration through properties.  So, finally, here are some.
      
      I got bogged down on this for a long time because I didn't want to
      expose offsets directly to properties to the callers.  But without
      that, attempting to make reasonable iteration functions just became
      horrible.  So eventually, I settled on an interface which does now
      expose property offsets.  fdt_first_property_offset() and
      fdt_next_property_offset() are used to step through the offsets of the
      properties starting from a particularly node offset.  The details of
      the property at each offset can then be retrieved with either
      fdt_get_property_by_offset() or fdt_getprop_by_offset() which have
      interfaces similar to fdt_get_property() and fdt_getprop()
      respectively.
      
      No explicit testcases are included, but we do use the new functions to
      reimplement the existing fdt_get_property() function.
      
      Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
      
      This was extracted from the DTC commit:
      73dca9ae0b9abe6924ba640164ecce9f8df69c5a Mon Sep 17 00:00:00 2001
      
      Signed-off-by: default avatarGerald Van Baren <vanbaren@cideas.com>
      d1c63148
      History
      libfdt: Implement property iteration functions
      David Gibson authored
      
      For ages, we've been talking about adding functions to libfdt to allow
      iteration through properties.  So, finally, here are some.
      
      I got bogged down on this for a long time because I didn't want to
      expose offsets directly to properties to the callers.  But without
      that, attempting to make reasonable iteration functions just became
      horrible.  So eventually, I settled on an interface which does now
      expose property offsets.  fdt_first_property_offset() and
      fdt_next_property_offset() are used to step through the offsets of the
      properties starting from a particularly node offset.  The details of
      the property at each offset can then be retrieved with either
      fdt_get_property_by_offset() or fdt_getprop_by_offset() which have
      interfaces similar to fdt_get_property() and fdt_getprop()
      respectively.
      
      No explicit testcases are included, but we do use the new functions to
      reimplement the existing fdt_get_property() function.
      
      Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
      
      This was extracted from the DTC commit:
      73dca9ae0b9abe6924ba640164ecce9f8df69c5a Mon Sep 17 00:00:00 2001
      
      Signed-off-by: default avatarGerald Van Baren <vanbaren@cideas.com>