+
+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",
+};
+
+enum usb_device_speed usb_get_maximum_speed(int node)
+{
+ const void *fdt = gd->fdt_blob;
+ const char *max_speed;
+ int i;
+
+ max_speed = fdt_getprop(fdt, node, "maximum-speed", NULL);
+ if (!max_speed) {
+ pr_err("usb maximum-speed not found\n");
+ return USB_SPEED_UNKNOWN;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(speed_names); i++)
+ if (!strcmp(max_speed, speed_names[i]))
+ return i;
+
+ return USB_SPEED_UNKNOWN;
+}