linux-kernel - [PATCH] net: PHY: bcm-unimac: Fix clock handling

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Date:   Tue, 24 Mar 2020 16:10:10 +0000
From:   Andre Przywara <andre.przywara@....com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Doug Berger <opendmb@...il.com>
Subject: [PATCH] net: PHY: bcm-unimac: Fix clock handling

The DT binding for this PHY describes an *optional* clock property.
Due to a bug in the error handling logic, we are actually ignoring this
clock *all* of the time so far.

Fix this by using devm_clk_get_optional() to handle this clock properly.

Signed-off-by: Andre Przywara <andre.przywara@....com>
---
 drivers/net/phy/mdio-bcm-unimac.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/mdio-bcm-unimac.c b/drivers/net/phy/mdio-bcm-unimac.c
index 4a28fb29adaa..fbd36891ee64 100644
--- a/drivers/net/phy/mdio-bcm-unimac.c
+++ b/drivers/net/phy/mdio-bcm-unimac.c
@@ -242,11 +242,9 @@ static int unimac_mdio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	priv->clk = devm_clk_get(&pdev->dev, NULL);
-	if (PTR_ERR(priv->clk) == -EPROBE_DEFER)
+	priv->clk = devm_clk_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(priv->clk))
 		return PTR_ERR(priv->clk);
-	else
-		priv->clk = NULL;
 
 	ret = clk_prepare_enable(priv->clk);
 	if (ret)
-- 
2.17.1