1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/core/common.c b/drivers/usb/core/common.c
new file mode 100644
index 0000000000..690d5a39ea
--- /dev/null
+++ b/drivers/usb/core/common.c
@@ -0,0 +1,19 @@
+#include <common.h>
+#include <usb/ch9.h>
+
+static const char *const speed_names[] = {
+	[USB_SPEED_UNKNOWN] = "UNKNOWN",
+	[USB_SPEED_LOW] = "low-speed",
+	[USB_SPEED_FULL] = "full-speed",
+	[USB_SPEED_HIGH] = "high-speed",
+	[USB_SPEED_WIRELESS] = "wireless",
+	[USB_SPEED_SUPER] = "super-speed",
+};
+
+const char *usb_speed_string(enum usb_device_speed speed)
+{
+	if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
+		speed = USB_SPEED_UNKNOWN;
+	return speed_names[speed];
+}
+EXPORT_SYMBOL_GPL(usb_speed_string);