diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 06bb9d4..d500996 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -546,6 +546,8 @@
 	  ci13xxx_udc core.
 	  This driver depends on OTG driver for PHY initialization,
 	  clock management, powering up VBUS, and power management.
+	  This driver is not supported on boards like trout which
+	  has an external PHY.
 
 	  Say "y" to link the driver statically, or "m" to build a
 	  dynamically linked module called "ci13xxx_msm" and force all
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 24046c0..0e6afa2 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -151,6 +151,8 @@
 	  Qualcomm chipsets. Root Hub has inbuilt TT.
 	  This driver depends on OTG driver for PHY initialization,
 	  clock management, powering up VBUS, and power management.
+	  This driver is not supported on boards like trout which
+	  has an external PHY.
 
 config USB_EHCI_HCD_PPC_OF
 	bool "EHCI support for PPC USB controller on OF platform bus"
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index 9fb875d..9ffc823 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -103,6 +103,8 @@
 	  required after resetting the hardware and power management.
 	  This driver is required even for peripheral only or host only
 	  mode configurations.
+	  This driver is not supported on boards like trout which
+	  has an external PHY.
 
 config AB8500_USB
         tristate "AB8500 USB Transceiver Driver"