<p><b>@bergzand</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10916#discussion_r270205720">sys/usb/usbus/usbus_control.c</a>:</p>
<pre style='color:#555'>> +{
+    usbus_fmt_hdr_conf(usbus);
+    return 1;
+}
+
+static int _req_dev_qualifier(usbus_t *usbus)
+{
+    usb_speed_t speed = USB_SPEED_LOW;
+
+    usbus->dev->driver->get(usbus->dev, USBOPT_MAX_SPEED, &speed,
+                            sizeof(usb_speed_t));
+    if (speed == USB_SPEED_HIGH) {
+        /* TODO: implement device qualifier support (only required
+         * for High speed) */
+    }
+    return -1;
</pre>
<p>Added a comment (negative signals a stall condition, <a href="https://github.com/RIOT-OS/RIOT/pull/10916/files#diff-38e020bc78b287d1782f6e35d81afcefR329">see also here</a>)</p>

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