In IEEE 1394 bus, one node can include multiple units, which represent certain functions such as video and audio. Although it's possible to distinguish each unit, Linux FireWire character device corresponding to the node can not have multiple group owners, therefore it's forced to select one of the units as representative for function. This commit adds database entries for units belongs to the same node. The entries are aligned to inverse order of corresponding unit order in configuration ROM to select the first unit as the representative. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
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