netdev - [PATCH v1] net: bcmgenet: Use devm_clk_get

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Date:   Mon, 20 Apr 2020 21:30:58 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1] net: bcmgenet: Use devm_clk_get_optional() to get the clocks

Conversion to devm_clk_get_optional() makes it explicit that clocks are
optional. This change allows to handle deferred probe in case clocks are
defined, but not yet probed. Due to above changes replace dev_dbg() by
dev_err() and bail out in error case.

While here, check potential error when enable main clock.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 .../net/ethernet/broadcom/genet/bcmgenet.c    | 25 +++++++++++--------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index ef275db018f73..045f7b7f0b5d3 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -3487,13 +3487,16 @@ static int bcmgenet_probe(struct platform_device *pdev)
 		priv->dma_max_burst_length = DMA_MAX_BURST_LENGTH;
 	}
 
-	priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
+	priv->clk = devm_clk_get_optional(&priv->pdev->dev, "enet");
 	if (IS_ERR(priv->clk)) {
-		dev_dbg(&priv->pdev->dev, "failed to get enet clock\n");
-		priv->clk = NULL;
+		dev_err(&priv->pdev->dev, "failed to get enet clock\n");
+		err = PTR_ERR(priv->clk);
+		goto err;
 	}
 
-	clk_prepare_enable(priv->clk);
+	err = clk_prepare_enable(priv->clk);
+	if (err)
+		goto err;
 
 	bcmgenet_set_hw_params(priv);
 
@@ -3511,16 +3514,18 @@ static int bcmgenet_probe(struct platform_device *pdev)
 	priv->rx_buf_len = RX_BUF_LENGTH;
 	INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
 
-	priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
+	priv->clk_wol = devm_clk_get_optional(&priv->pdev->dev, "enet-wol");
 	if (IS_ERR(priv->clk_wol)) {
-		dev_dbg(&priv->pdev->dev, "failed to get enet-wol clock\n");
-		priv->clk_wol = NULL;
+		dev_err(&priv->pdev->dev, "failed to get enet-wol clock\n");
+		err = PTR_ERR(priv->clk_wol);
+		goto err;
 	}
 
-	priv->clk_eee = devm_clk_get(&priv->pdev->dev, "enet-eee");
+	priv->clk_eee = devm_clk_get_optional(&priv->pdev->dev, "enet-eee");
 	if (IS_ERR(priv->clk_eee)) {
-		dev_dbg(&priv->pdev->dev, "failed to get enet-eee clock\n");
-		priv->clk_eee = NULL;
+		dev_err(&priv->pdev->dev, "failed to get enet-eee clock\n");
+		err = PTR_ERR(priv->clk_eee);
+		goto err;
 	}
 
 	/* If this is an internal GPHY, power it on now, before UniMAC is
-- 
2.26.1