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# USB Core configuration
config USB_DEBUG
bool "USB verbose debug messages"
Say Y here if you want the USB core & hub drivers to produce a bunch
of debug messages to the system log. Select this if you are having a
problem with USB support and want to see more of what is going on.
bool "USB announce new devices"
default N
Say Y here if you want the USB core to always announce the
idVendor, idProduct, Manufacturer, Product, and SerialNumber
strings for every new USB device to the syslog. This option is
usually used by distro vendors to help with debugging and to
let users know what specific device was added to the machine
in what location.
If you do not want this kind of information sent to the system
log, or have any doubts about this, say N here.
comment "Miscellaneous USB options"
bool "Enable USB persist by default"
default y
Say N here if you don't want USB power session persistence
enabled by default. If you say N it will make suspended USB
devices that lose power get reenumerated as if they had been
unplugged, causing any mounted filesystems to be lost. The
persist feature can still be enabled for individual devices
through the power/persist sysfs node. See
Documentation/usb/persist.txt for more info.
If you have any questions about this, say Y here, only say N
if you know exactly what you are doing.
bool "Dynamic USB minor allocation"
If you say Y here, the USB subsystem will use dynamic minor
allocation for any device that uses the USB major number.
This means that you can have more than 16 of a single type
of device (like USB printers).
If you are unsure about this, say N here.
config USB_OTG
bool "OTG support"
depends on PM_RUNTIME
default n
The most notable feature of USB OTG is support for a
"Dual-Role" device, which can act as either a device
or a host. The initial role is decided by the type of
plug inserted and can be changed later when two dual
role devices talk to each other.
Select this only if your board has Mini-AB/Micro-AB
bool "Rely on OTG Targeted Peripherals List"
depends on USB_OTG || EXPERT
default y if USB_OTG
If you say Y here, the "otg_whitelist.h" file will be used as a
product whitelist, so USB peripherals not listed there will be
rejected during enumeration. This behavior is required by the
USB OTG specification for all devices not on your product's
"Targeted Peripherals List". "Embedded Hosts" are likewise
allowed to support only a limited number of peripherals.
Otherwise, peripherals not listed there will only generate a
warning and enumeration will continue. That's more like what
normal Linux-USB hosts do (other than the warning), and is
convenient for many stages of product development.
bool "Disable external hubs"
depends on USB_OTG || EXPERT
If you say Y here, then Linux will refuse to enumerate
external hubs. OTG hosts are allowed to reduce hardware
and software costs by not supporting external hubs. So
are "Embedded Hosts" that don't offer OTG support.