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: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -111,14 +111,16 @@ config USB_OTG
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config USB_OTG_WHITELIST
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config USB_OTG_WHITELIST
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bool "Rely on OTG Targeted Peripherals List"
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bool "Rely on OTG Targeted Peripherals List"
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depends on USB_OTG
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depends on USB_OTG || EMBEDDED
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default y
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default y if USB_OTG
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default n if EMBEDDED
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help
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help
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If you say Y here, the "otg_whitelist.h" file will be used as a
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If you say Y here, the "otg_whitelist.h" file will be used as a
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product whitelist, so USB peripherals not listed there will be
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product whitelist, 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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rejected during enumeration. This behavior is required by the
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USB OTG specification for all devices not on your product's
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USB OTG specification for all devices not on your product's
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"Targeted Peripherals List".
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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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Otherwise, peripherals not listed there will only generate a
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Otherwise, peripherals not listed there will only generate a
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warning and enumeration will continue. That's more like what
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warning and enumeration will continue. That's more like what
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@ -127,9 +129,10 @@ config USB_OTG_WHITELIST
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config USB_OTG_BLACKLIST_HUB
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config USB_OTG_BLACKLIST_HUB
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bool "Disable external hubs"
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bool "Disable external hubs"
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depends on USB_OTG
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depends on USB_OTG || EMBEDDED
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help
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help
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If you say Y here, then Linux will refuse to enumerate
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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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external hubs. OTG hosts are allowed to reduce hardware
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and software costs by not supporting external hubs.
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and software costs by not supporting external hubs. So
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are "Emedded Hosts" that don't offer OTG support.
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