net: mvmdio: print warning when orion-mdio has too many clocks

Print a warning when device tree specifies more than the maximum of four
clocks supported by orion-mdio. Because reading from mdio can lock up
the Armada 8k when a required clock is not initialized, it is important
to notify the user when a specified clock is ignored.
Signed-off-by: Josua Mayer <josua@solid-run.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvmdio.c

@@ -326,6 +326,10 @@ 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 "
+			 __stringify(ARRAY_SIZE(dev->clk)) "\n");
+
 	dev->err_interrupt = platform_get_irq(pdev, 0);
 	if (dev->err_interrupt > 0 &&
 	    resource_size(r) < MVMDIO_ERR_INT_MASK + 4) {