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  1 #
  2 # USB Core configuration
  3 #
  4 config USB_DEBUG
  5         bool "USB verbose debug messages"
  6         help
  7           Say Y here if you want the USB core & hub drivers to produce a bunch
  8           of debug messages to the system log. Select this if you are having a
  9           problem with USB support and want to see more of what is going on.
 12         bool "USB announce new devices"
 13         help
 14           Say Y here if you want the USB core to always announce the
 15           idVendor, idProduct, Manufacturer, Product, and SerialNumber
 16           strings for every new USB device to the syslog.  This option is
 17           usually used by distro vendors to help with debugging and to
 18           let users know what specific device was added to the machine
 19           in what location.
 21           If you do not want this kind of information sent to the system
 22           log, or have any doubts about this, say N here.
 24 comment "Miscellaneous USB options"
 27         bool "Enable USB persist by default"
 28         default y
 29         help
 30           Say N here if you don't want USB power session persistence
 31           enabled by default.  If you say N it will make suspended USB
 32           devices that lose power get reenumerated as if they had been
 33           unplugged, causing any mounted filesystems to be lost.  The
 34           persist feature can still be enabled for individual devices
 35           through the power/persist sysfs node. See
 36           Documentation/usb/persist.txt for more info.
 38           If you have any questions about this, say Y here, only say N
 39           if you know exactly what you are doing.
 42         bool "Dynamic USB minor allocation"
 43         help
 44           If you say Y here, the USB subsystem will use dynamic minor
 45           allocation for any device that uses the USB major number.
 46           This means that you can have more than 16 of a single type
 47           of device (like USB printers).
 49           If you are unsure about this, say N here.
 51 config USB_OTG
 52         bool "OTG support"
 53         depends on PM_RUNTIME
 54         default n
 55         help
 56           The most notable feature of USB OTG is support for a
 57           "Dual-Role" device, which can act as either a device
 58           or a host. The initial role is decided by the type of
 59           plug inserted and can be changed later when two dual
 60           role devices talk to each other.
 62           Select this only if your board has Mini-AB/Micro-AB
 63           connector.
 66         bool "Rely on OTG Targeted Peripherals List"
 67         depends on USB_OTG || EXPERT
 68         default y if USB_OTG
 69         help
 70           If you say Y here, the "otg_whitelist.h" file will be used as a
 71           product whitelist, so USB peripherals not listed there will be
 72           rejected during enumeration.  This behavior is required by the
 73           USB OTG specification for all devices not on your product's
 74           "Targeted Peripherals List".  "Embedded Hosts" are likewise
 75           allowed to support only a limited number of peripherals.
 77           Otherwise, peripherals not listed there will only generate a
 78           warning and enumeration will continue.  That's more like what
 79           normal Linux-USB hosts do (other than the warning), and is
 80           convenient for many stages of product development.
 83         bool "Disable external hubs"
 84         depends on USB_OTG || EXPERT
 85         help
 86           If you say Y here, then Linux will refuse to enumerate
 87           external hubs.  OTG hosts are allowed to reduce hardware
 88           and software costs by not supporting external hubs.  So
 89           are "Embedded Hosts" that don't offer OTG support.

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