What:		/config/pcie-gadget
Date:		Feb 2011
KernelVersion:	2.6.37
Contact:	Pratyush Anand <pratyush.anand@st.com>
Description:

	Interface is used to configure selected dual mode PCIe controller
	as device and then program its various registers to configure it
	as a particular device type.
	This interfaces can be used to show spear's PCIe device capability.

	Nodes are only visible when configfs is mounted. To mount configfs
	in /config directory use:
	# mount -t configfs none /config/

	For nth PCIe Device Controller
	/config/pcie-gadget.n/
		link ... used to enable ltssm and read its status.
		int_type ...used to configure and read type of supported
			interrupt
		no_of_msi ... used to configure number of MSI vector needed and
			to read no of MSI granted.
		inta ... write 1 to assert INTA and 0 to de-assert.
		send_msi ... write MSI vector to be sent.
		vendor_id ... used to write and read vendor id (hex)
		device_id ... used to write and read device id (hex)
		bar0_size ... used to write and read bar0_size
		bar0_address ... used to write and read bar0 mapped area in hex.
		bar0_rw_offset ... used to write and read offset of bar0 where
			bar0_data will be written or read.
		bar0_data ... used to write and read data at bar0_rw_offset.