From 3e59f59015e39ceb870fa8a7a12e0464e775512b Mon Sep 17 00:00:00 2001
From: Bin Meng
Date: Thu, 7 Sep 2017 06:13:17 -0700
Subject: dm: usb: Add a new USB controller operation 'get_max_xfer_size'

The HCD may have limitation on the maximum bytes to be transferred
in a USB transfer. USB class driver needs to be aware of this.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
---
 include/usb.h | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'include/usb.h')

diff --git a/include/usb.h b/include/usb.h
index fad04016a34..0ddc0822b41 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -766,6 +766,14 @@ struct dm_usb_ops {
 	 * representation of this hub can be updated (xHCI)
 	 */
 	int (*update_hub_device)(struct udevice *bus, struct usb_device *udev);
+
+	/**
+	 * get_max_xfer_size() - Get HCD's maximum transfer bytes
+	 *
+	 * The HCD may have limitation on the maximum bytes to be transferred
+	 * in a USB transfer. USB class driver needs to be aware of this.
+	 */
+	int (*get_max_xfer_size)(struct udevice *bus, size_t *size);
 };
 
 #define usb_get_ops(dev)	((struct dm_usb_ops *)(dev)->driver->ops)
@@ -939,7 +947,7 @@ int usb_new_device(struct usb_device *dev);
 int usb_alloc_device(struct usb_device *dev);
 
 /**
- * update_hub_device() - Update HCD's internal representation of hub
+ * usb_update_hub_device() - Update HCD's internal representation of hub
  *
  * After a hub descriptor is fetched, notify HCD so that its internal
  * representation of this hub can be updated.
@@ -949,6 +957,18 @@ int usb_alloc_device(struct usb_device *dev);
  */
 int usb_update_hub_device(struct usb_device *dev);
 
+/**
+ * usb_get_max_xfer_size() - Get HCD's maximum transfer bytes
+ *
+ * The HCD may have limitation on the maximum bytes to be transferred
+ * in a USB transfer. USB class driver needs to be aware of this.
+ *
+ * @dev:		USB device
+ * @size:		maximum transfer bytes
+ * @return 0 if OK, -ve on error
+ */
+int usb_get_max_xfer_size(struct usb_device *dev, size_t *size);
+
 /**
  * usb_emul_setup_device() - Set up a new USB device emulation
  *
-- 
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