xref: /openbmc/linux/drivers/usb/core/Kconfig (revision b34e08d5)
1#
2# USB Core configuration
3#
4config 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.
10
11config USB_ANNOUNCE_NEW_DEVICES
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.
20
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.
23
24comment "Miscellaneous USB options"
25
26config USB_DEFAULT_PERSIST
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.
37
38	  If you have any questions about this, say Y here, only say N
39	  if you know exactly what you are doing.
40
41config USB_DYNAMIC_MINORS
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).
48
49	  If you are unsure about this, say N here.
50
51config 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.
61
62	  Select this only if your board has Mini-AB/Micro-AB
63	  connector.
64
65config USB_OTG_WHITELIST
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.
76
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.
81
82config USB_OTG_BLACKLIST_HUB
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.
90
91