drivers/net/ethernet/marvell/mvmdio.c: Fix non OF case

Orion5.x systems are still using machine files and not device-tree.
Commit 96cb4342 ("net: mvmdio: allow up to three clocks to be
specified for orion-mdio") has replaced devm_clk_get() with of_clk_get(),
leading to a oops at boot and not working network, as reported in
https://lists.debian.org/debian-arm/2019/07/msg00088.html and possibly in
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=908712.

Link: https://lists.debian.org/debian-arm/2019/07/msg00088.html
Fixes: 96cb4342 ("net: mvmdio: allow up to three clocks to be specified for orion-mdio")
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvmdio.c

@@ -319,6 +319,7 @@ static int orion_mdio_probe(struct platform_device *pdev)
 
 	init_waitqueue_head(&dev->smi_busy_wait);
 
+	if (pdev->dev.of_node) {
 		for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
 			dev->clk[i] = of_clk_get(pdev->dev.of_node, i);
 			if (PTR_ERR(dev->clk[i]) == -EPROBE_DEFER) {
@@ -330,9 +331,21 @@ static int orion_mdio_probe(struct platform_device *pdev)
 			clk_prepare_enable(dev->clk[i]);
 		}
 
-	if (!IS_ERR(of_clk_get(pdev->dev.of_node, ARRAY_SIZE(dev->clk))))
-		dev_warn(&pdev->dev, "unsupported number of clocks, limiting to the first "
+		if (!IS_ERR(of_clk_get(pdev->dev.of_node,
+				       ARRAY_SIZE(dev->clk))))
+			dev_warn(&pdev->dev,
+				 "unsupported number of clocks, limiting to the first "
 				 __stringify(ARRAY_SIZE(dev->clk)) "\n");
+	} else {
+		dev->clk[0] = clk_get(&pdev->dev, NULL);
+		if (PTR_ERR(dev->clk[0]) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto out_clk;
+		}
+		if (!IS_ERR(dev->clk[0]))
+			clk_prepare_enable(dev->clk[0]);
+	}
+
 
 	dev->err_interrupt = platform_get_irq(pdev, 0);
 	if (dev->err_interrupt > 0 &&