enable_otg_host 1725 drivers/usb/host/imx21-hcd.c if (imx21->pdata->enable_otg_host) enable_otg_host 1800 drivers/usb/host/imx21-hcd.c .enable_otg_host = 1, enable_otg_host 22 include/linux/platform_data/usb-mx2.h enable_otg_host:1, /* enable "OTG" port (as host) */