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Commit 22552b28 authored by Robin Getz's avatar Robin Getz Committed by Greg Kroah-Hartman
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USB: partial USB embedded host support 



This provides better support for USB "Embedded Host" functionality, which
is a subset of the USB OTG options:

 * External hub support can be disabled;

 * USB peripherals not whitelisted in "otg_whitelist.h" will be rejected
   during enumeration.

These options can allow some savings in software and support.

Signed-off-by: default avatarRobin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent b56394bf

drivers/usb/core/Kconfig

+8 −5
Original line number Diff line number Diff line
@@ -111,14 +111,16 @@ config USB_OTG 


config USB_OTG_WHITELIST

	bool "Rely on OTG Targeted Peripherals List"

	depends on USB_OTG

	default y

	depends on USB_OTG || EMBEDDED

	default y if USB_OTG

	default n if EMBEDDED

	help

	  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".

	  "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
@@ -127,9 +129,10 @@ config USB_OTG_WHITELIST 


config USB_OTG_BLACKLIST_HUB

	bool "Disable external hubs"

	depends on USB_OTG

	depends on USB_OTG || EMBEDDED

	help

	  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.

	  and software costs by not supporting external hubs.  So

	  are "Emedded Hosts" that don't offer OTG support.