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Subject[PATCH 5.2 10/56] drivers/net/ethernet/marvell/mvmdio.c: Fix non OF case
Date
From: "Arnaud Patard (Rtp)" <arnaud.patard@rtp-net.org>

[ 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>
---
drivers/net/ethernet/marvell/mvmdio.c | 28 ++++++++++++++++++++++------
1 file changed, 22 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -319,15 +319,31 @@ static int orion_mdio_probe(struct platf

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);

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