dm: usb: Add a generic descriptor struct

This is useful for creating lists of descriptors, and is better than using
void * for this purpose.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 10675b4d8ab575545c08dfab1c2394f4a27905ca..822fca0357b551021c7039f7014089c606c06e1a 100644 (file)
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -379,6 +379,11 @@ struct usb_endpoint_descriptor {
 #define USB_DT_ENDPOINT_SIZE           7
 #define USB_DT_ENDPOINT_AUDIO_SIZE     9       /* Audio extension */
 
+/* Used to access common fields */
+struct usb_generic_descriptor {
+       __u8  bLength;
+       __u8  bDescriptorType;
+};
 
 /*
  * Endpoints