usb: core: phy: add missing forward declaration for "struct device"

Currently hcd.c is the only consumer of the usb_phy_roothub logic. This
already includes the required header files so struct device is known.
However, future consumers might not know about struct device.
Add a forward declaration for struct device to fix potential future
consumers which don't include any of the struct device API headers.

Fixes: 07dbff0ddbd86c ("usb: core: add a wrapper for the USB PHYs on the HCD")
Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/phy.h b/drivers/usb/core/phy.h
index 605555901d443457b4414359716d3584f1a91f68..bbc96938307498cead99de42f03f619a7bbe5e2a 100644 (file)
--- a/drivers/usb/core/phy.h
+++ b/drivers/usb/core/phy.h
@@ -1,3 +1,4 @@
+struct device;
 struct usb_phy_roothub;
 
 struct usb_phy_roothub *usb_phy_roothub_alloc(struct device *dev);