From: Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>
Date: Fri, 2 Aug 2019 08:32:40 +0000 (+0200)
Subject: drivers/net/ethernet/marvell/mvmdio.c: Fix non OF case
X-Git-Tag: v5.2.8~47
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dd7a9d8d0aa1a5225ef1edad143e52ce7919a47c;p=users%2Fdwmw2%2Flinux.git

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

[ Upstream commit d934423ac26ed373dfe089734d505dca5ff679b6 ]

Orion5.x systems are still using machine files and not device-tree.
Commit 96cb4342382290c9 ("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: 96cb4342382290c9 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
index ee7857298361d..aca878a3f81ff 100644
--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -319,15 +319,31 @@ static int orion_mdio_probe(struct platform_device *pdev)
 
 	init_waitqueue_head(&dev->smi_busy_wait);
 
-	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) {
+	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) {
+				ret = -EPROBE_DEFER;
+				goto out_clk;
+			}
+			if (IS_ERR(dev->clk[i]))
+				break;
+			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 "
+				 __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[i]))
-			break;
-		clk_prepare_enable(dev->clk[i]);
+		if (!IS_ERR(dev->clk[0]))
+			clk_prepare_enable(dev->clk[0]);
 	}
 
 	dev->err_interrupt = platform_get_irq(pdev, 0);