[RFC/PATCH v2 1/3] usb: gadget: add quirks field to struct usb_gadget

[David Cohen <david.a.cohen@linux.intel.com>]

Due to USB controllers may have different restrictions, usb gadget layer
needs to provide a generic way to inform gadget functions to complain
with non-standard requirements.

This patch adds 'quirks' field to struct usb_gadget and the first quirk
called USB_GADGET_QUIRK_EP_OUT_ALIGNED_SIZE necessary to inform when
controller's epout requires buffer size to be aligned to MaxPacketSize.

Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
---
 include/linux/usb/gadget.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 942ef5e..7014ad9 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -540,6 +540,11 @@ struct usb_gadget {
 	struct device			dev;
 	unsigned			out_epnum;
 	unsigned			in_epnum;
+
+	u32				quirks;
+/* epout requires buffer size to be aligned to MaxPacketSize */
+#define USB_GADGET_QUIRK_EP_OUT_ALIGNED_SIZE		(1 << 0)
+
 };
 #define work_to_gadget(w)	(container_of((w), struct usb_gadget, work))
 
-- 
1.8.4.rc3