The helper usb_of_get_child_node is defined at of.c, but missing its
declare as a global function. Fix it by adding related header file
as well as compile it on conditional of CONFIG_OF.

Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: Alan Stern <st...@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org
Cc: linux-ker...@vger.kernel.org
Cc: Ben Dooks <ben.do...@codethink.co.uk>
Cc: linux-ker...@lists.codethink.co.uk

Signed-off-by: Peter Chen <peter.c...@nxp.com>
Reported-by: Ben Dooks <ben.do...@codethink.co.uk>
---
 drivers/usb/core/Makefile | 3 ++-
 drivers/usb/core/of.c     | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile
index 9780877..da36b78 100644
--- a/drivers/usb/core/Makefile
+++ b/drivers/usb/core/Makefile
@@ -5,8 +5,9 @@
 usbcore-y := usb.o hub.o hcd.o urb.o message.o driver.o
 usbcore-y += config.o file.o buffer.o sysfs.o endpoint.o
 usbcore-y += devio.o notify.o generic.o quirks.o devices.o
-usbcore-y += port.o of.o
+usbcore-y += port.o
 
+usbcore-$(CONFIG_OF)           += of.o
 usbcore-$(CONFIG_PCI)          += hcd-pci.o
 usbcore-$(CONFIG_ACPI)         += usb-acpi.o
 
diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c
index 2289700..3de4f88 100644
--- a/drivers/usb/core/of.c
+++ b/drivers/usb/core/of.c
@@ -18,6 +18,7 @@
  */
 
 #include <linux/of.h>
+#include <linux/usb/of.h>
 
 /**
  * usb_of_get_child_node - Find the device node match port number
-- 
1.9.1

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