From: Robin Getz Date: Thu, 6 Mar 2008 07:17:38 +0000 (-0800) Subject: USB: partial USB embedded host support X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=22552b286b44b8988e08fb74379507a9b32521b0;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig index c15621d64579..fee864c9e62d 100644 --- a/drivers/usb/core/Kconfig +++ b/drivers/usb/core/Kconfig @@ -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.