# SPDX-License-Identifier: GPL-2.0
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#
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# USB Core configuration
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#
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config USB_ANNOUNCE_NEW_DEVICES
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bool "USB announce new devices"
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help
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Say Y here if you want the USB core to always announce the
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idVendor, idProduct, Manufacturer, Product, and SerialNumber
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strings for every new USB device to the syslog. This option is
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usually used by distro vendors to help with debugging and to
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let users know what specific device was added to the machine
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in what location.
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If you do not want this kind of information sent to the system
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log, or have any doubts about this, say N here.
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comment "Miscellaneous USB options"
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config USB_DEFAULT_PERSIST
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bool "Enable USB persist by default"
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default y
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help
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Say N here if you don't want USB power session persistence
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enabled by default. If you say N it will make suspended USB
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devices that lose power get reenumerated as if they had been
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unplugged, causing any mounted filesystems to be lost. The
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persist feature can still be enabled for individual devices
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through the power/persist sysfs node. See
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Documentation/driver-api/usb/persist.rst for more info.
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If you have any questions about this, say Y here, only say N
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if you know exactly what you are doing.
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config USB_FEW_INIT_RETRIES
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bool "Limit USB device initialization to only a few retries"
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help
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When a new USB device is detected, the kernel tries very hard
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to initialize and enumerate it, with lots of nested retry loops.
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This almost always works, but when it fails it can take a long time.
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This option tells the kernel to make only a few retry attempts,
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so that the total time required for a failed initialization is
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no more than 30 seconds (as required by the USB OTG spec).
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Say N here unless you require new-device enumeration failure to
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occur within 30 seconds (as might be needed in an embedded
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application).
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config USB_DYNAMIC_MINORS
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bool "Dynamic USB minor allocation"
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help
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If you say Y here, the USB subsystem will use dynamic minor
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allocation for any device that uses the USB major number.
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This means that you can have more than 16 of a single type
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of device (like USB printers).
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If you are unsure about this, say N here.
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config USB_OTG
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bool "OTG support"
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depends on PM
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help
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The most notable feature of USB OTG is support for a
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"Dual-Role" device, which can act as either a device
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or a host. The initial role is decided by the type of
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plug inserted and can be changed later when two dual
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role devices talk to each other.
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Select this only if your board has Mini-AB/Micro-AB
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connector.
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config USB_OTG_PRODUCTLIST
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bool "Rely on OTG and EH Targeted Peripherals List"
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depends on USB
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help
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If you say Y here, the "otg_productlist.h" file will be used as a
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product list, so USB peripherals not listed there will be
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rejected during enumeration. This behavior is required by the
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USB OTG and EH specification for all devices not on your product's
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"Targeted Peripherals List". "Embedded Hosts" are likewise
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allowed to support only a limited number of peripherals.
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config USB_OTG_DISABLE_EXTERNAL_HUB
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bool "Disable external hubs"
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depends on USB_OTG || EXPERT
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help
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If you say Y here, then Linux will refuse to enumerate
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external hubs. OTG hosts are allowed to reduce hardware
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and software costs by not supporting external hubs. So
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are "Embedded Hosts" that don't offer OTG support.
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config USB_OTG_FSM
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tristate "USB 2.0 OTG FSM implementation"
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depends on USB && USB_OTG
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select USB_PHY
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help
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Implements OTG Finite State Machine as specified in On-The-Go
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and Embedded Host Supplement to the USB Revision 2.0 Specification.
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config USB_LEDS_TRIGGER_USBPORT
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tristate "USB port LED trigger"
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depends on USB && LEDS_TRIGGERS
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help
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This driver allows LEDs to be controlled by USB events. Enabling this
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trigger allows specifying list of USB ports that should turn on LED
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when some USB device gets connected.
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config USB_AUTOSUSPEND_DELAY
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int "Default autosuspend delay"
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depends on USB
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default 2
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help
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The default autosuspend delay in seconds. Can be overridden
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with the usbcore.autosuspend command line or module parameter.
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The default value Linux has always had is 2 seconds. Change
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this value if you want a different delay and cannot modify
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the command line or module parameter.
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