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_WHITELIST 59 bool "Rely on OTG and EH Targeted Peripherals List" 60 depends on USB 61 help 62 If you say Y here, the "otg_whitelist.h" file will be used as a 63 product whitelist, 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_BLACKLIST_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. 105