dm: usb: Add support for USB ethernet devices with driver model

Add support for scanning USB etghernet devices with driver model. This mostly
involves scanning all buses since device numbering is not unique across
buses.

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

drivers/usb/eth/usb_ether.c

@@ -5,7 +5,9 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <usb.h>
+#include <dm/device-internal.h>
 
 #include "usb_ether.h"
 
@@ -118,8 +120,6 @@ static void probe_valid_drivers(struct usb_device *dev)
 int usb_host_eth_scan(int mode)
 {
 	int i, old_async;
-	struct usb_device *dev;
-
 
 	if (mode == 1)
 		printf("       scanning usb for ethernet devices... ");
@@ -138,23 +138,59 @@ int usb_host_eth_scan(int mode)
 	}
 
 	usb_max_eth_dev = 0;
+#ifdef CONFIG_DM_USB
+	/*
+	 * TODO: We should add USB_DEVICE() declarations to each USB ethernet
+	 * driver and then most of this file can be removed.
+	 */
+	struct udevice *bus;
+	struct uclass *uc;
+	int ret;
+
+	ret = uclass_get(UCLASS_USB, &uc);
+	if (ret)
+		return ret;
+	uclass_foreach_dev(bus, uc) {
+		for (i = 0; i < USB_MAX_DEVICE; i++) {
+			struct usb_device *dev;
+
+			dev = usb_get_dev_index(bus, i); /* get device */
+			debug("i=%d, %s\n", i, dev ? dev->dev->name : "(done)");
+			if (!dev)
+				break; /* no more devices available */
+
+			/*
+			 * find valid usb_ether driver for this device,
+			 * if any
+			 */
+			probe_valid_drivers(dev);
+
+			/* check limit */
+			if (usb_max_eth_dev == USB_MAX_ETH_DEV)
+				break;
+		} /* for */
+	}
+#else
 	for (i = 0; i < USB_MAX_DEVICE; i++) {
+		struct usb_device *dev;
+
 		dev = usb_get_dev_index(i); /* get device */
 		debug("i=%d\n", i);
-		if (dev == NULL)
+		if (!dev)
 			break; /* no more devices available */
 
 		/* find valid usb_ether driver for this device, if any */
 		probe_valid_drivers(dev);
 
 		/* check limit */
-		if (usb_max_eth_dev == USB_MAX_ETH_DEV) {
-			printf("max USB Ethernet Device reached: %d stopping\n",
-				usb_max_eth_dev);
+		if (usb_max_eth_dev == USB_MAX_ETH_DEV)
 			break;
-		}
 	} /* for */
-
+#endif
+	if (usb_max_eth_dev == USB_MAX_ETH_DEV) {
+		printf("max USB Ethernet Device reached: %d stopping\n",
+		       usb_max_eth_dev);
+	}
 	usb_disable_asynch(old_async); /* restore asynch value */
 	printf("%d Ethernet Device(s) found\n", usb_max_eth_dev);
 	if (usb_max_eth_dev > 0)