1# SPDX-License-Identifier: GPL-2.0
  2#
  3# USB Core configuration
  4#
  5config USB_ANNOUNCE_NEW_DEVICES
  6	bool "USB announce new devices"
  7	help
  8	  Say Y here if you want the USB core to always announce the
  9	  idVendor, idProduct, Manufacturer, Product, and SerialNumber
 10	  strings for every new USB device to the syslog.  This option is
 11	  usually used by distro vendors to help with debugging and to
 12	  let users know what specific device was added to the machine
 13	  in what location.
 14
 15	  If you do not want this kind of information sent to the system
 16	  log, or have any doubts about this, say N here.
 17
 18comment "Miscellaneous USB options"
 19
 20config USB_DEFAULT_PERSIST
 21	bool "Enable USB persist by default"
 22	default y
 23	help
 24	  Say N here if you don't want USB power session persistence
 25	  enabled by default.  If you say N it will make suspended USB
 26	  devices that lose power get reenumerated as if they had been
 27	  unplugged, causing any mounted filesystems to be lost.  The
 28	  persist feature can still be enabled for individual devices
 29	  through the power/persist sysfs node. See
 30	  Documentation/driver-api/usb/persist.rst for more info.
 31
 32	  If you have any questions about this, say Y here, only say N
 33	  if you know exactly what you are doing.
 34
 35config USB_DYNAMIC_MINORS
 36	bool "Dynamic USB minor allocation"
 37	help
 38	  If you say Y here, the USB subsystem will use dynamic minor
 39	  allocation for any device that uses the USB major number.
 40	  This means that you can have more than 16 of a single type
 41	  of device (like USB printers).
 42
 43	  If you are unsure about this, say N here.
 44
 45config USB_OTG
 46	bool "OTG support"
 47	depends on PM
 48	help
 49	  The most notable feature of USB OTG is support for a
 50	  "Dual-Role" device, which can act as either a device
 51	  or a host. The initial role is decided by the type of
 52	  plug inserted and can be changed later when two dual
 53	  role devices talk to each other.
 54
 55	  Select this only if your board has Mini-AB/Micro-AB
 56	  connector.
 57
 58config USB_OTG_PRODUCTLIST
 59	bool "Rely on OTG and EH Targeted Peripherals List"
 60	depends on USB
 61	help
 62	  If you say Y here, the "otg_productlist.h" file will be used as a
 63	  product list, so USB peripherals not listed there will be
 64	  rejected during enumeration.  This behavior is required by the
 65	  USB OTG and EH specification for all devices not on your product's
 66	  "Targeted Peripherals List".  "Embedded Hosts" are likewise
 67	  allowed to support only a limited number of peripherals.
 68
 69config USB_OTG_DISABLE_EXTERNAL_HUB
 70	bool "Disable external hubs"
 71	depends on USB_OTG || EXPERT
 72	help
 73	  If you say Y here, then Linux will refuse to enumerate
 74	  external hubs.  OTG hosts are allowed to reduce hardware
 75	  and software costs by not supporting external hubs.  So
 76	  are "Embedded Hosts" that don't offer OTG support.
 77
 78config USB_OTG_FSM
 79	tristate "USB 2.0 OTG FSM implementation"
 80	depends on USB && USB_OTG
 81	select USB_PHY
 82	help
 83	  Implements OTG Finite State Machine as specified in On-The-Go
 84	  and Embedded Host Supplement to the USB Revision 2.0 Specification.
 85
 86config USB_LEDS_TRIGGER_USBPORT
 87	tristate "USB port LED trigger"
 88	depends on USB && LEDS_TRIGGERS
 89	help
 90	  This driver allows LEDs to be controlled by USB events. Enabling this
 91	  trigger allows specifying list of USB ports that should turn on LED
 92	  when some USB device gets connected.
 93
 94config USB_AUTOSUSPEND_DELAY
 95	int "Default autosuspend delay"
 96	depends on USB
 97	default 2
 98	help
 99	  The default autosuspend delay in seconds.  Can be overridden
100	  with the usbcore.autosuspend command line or module parameter.
101
102	  The default value Linux has always had is 2 seconds.  Change
103	  this value if you want a different delay and cannot modify
104	  the command line or module parameter.