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Add the documentation about HD-audio DP MST: 1. pin initialization 2. device entry connection list Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Libin Yang <libin.yang@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1484208294-8637-4-git-send-email-libin.yang@intel.com