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ADP (Attach Detection Protocol) is introduced to detect remote device presence with out applying power on VBUS. A-device performs ADP probing and applies power on VBUS when remote device is attached. B-device perform ADP sensing and request session via SRP when remote device is attached. B-device can claim their ADP capability in OTG descriptor. HNP polling is introduced for peripheral device to notify its wish to become host. Host device polls (i.e execute GetStatus()) peripheral and suspend the bus when peripheral returns host_request True. a_alt_hnp_support feature is obsoleted and a_hnp_support feature is limited to legacy B-devices i.e compliant to older than Rev 2.0 spec. Change-Id: I1a3c9d35b5e77282da8a47bafd8bc0cc4e5ae1fa Signed-off-by: Pavankumar Kondeti <pkondeti@qualcomm.com>