netdev - [PATCH net-next 2/2] net/davinci_emac: use clk

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Date:	Mon, 25 Mar 2013 14:55:47 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	"David S. Miller" <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Sekhar Nori <nsekhar@...com>,
	Mike Turquette <mturquette@...aro.org>
Subject: [PATCH net-next 2/2] net/davinci_emac: use clk_{prepare|unprepare}

Use clk_prepare()/clk_unprepare() in the driver since common
clock framework needs these to be called before clock is enabled.

This is in preparation of common clock framework migration
for DaVinci.

Cc: Mike Turquette <mturquette@...aro.org>
Signed-off-by: Sekhar Nori <nsekhar@...com>
---
 drivers/net/ethernet/ti/davinci_emac.c |   19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index b1349b5..436296c 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -350,6 +350,7 @@ struct emac_priv {
 	/*platform specific members*/
 	void (*int_enable) (void);
 	void (*int_disable) (void);
+	struct clk *clk;
 };
 
 /* EMAC TX Host Error description strings */
@@ -1870,19 +1871,29 @@ static int davinci_emac_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "failed to get EMAC clock\n");
 		return -EBUSY;
 	}
+
+	rc = clk_prepare(emac_clk);
+	if (rc) {
+		dev_err(&pdev->dev, "emac clock prepare failed.\n");
+		return rc;
+	}
+
 	emac_bus_frequency = clk_get_rate(emac_clk);
 
 	/* TODO: Probe PHY here if possible */
 
 	ndev = alloc_etherdev(sizeof(struct emac_priv));
-	if (!ndev)
-		return -ENOMEM;
+	if (!ndev) {
+		rc = -ENOMEM;
+		goto no_etherdev;
+	}
 
 	platform_set_drvdata(pdev, ndev);
 	priv = netdev_priv(ndev);
 	priv->pdev = pdev;
 	priv->ndev = ndev;
 	priv->msg_enable = netif_msg_init(debug_level, DAVINCI_EMAC_DEBUG);
+	priv->clk = emac_clk;
 
 	spin_lock_init(&priv->lock);
 
@@ -2020,6 +2031,8 @@ no_cpdma_chan:
 	cpdma_ctlr_destroy(priv->dma);
 no_pdata:
 	free_netdev(ndev);
+no_etherdev:
+	clk_unprepare(emac_clk);
 	return rc;
 }
 
@@ -2048,6 +2061,8 @@ static int davinci_emac_remove(struct platform_device *pdev)
 	unregister_netdev(ndev);
 	free_netdev(ndev);
 
+	clk_unprepare(priv->clk);
+
 	return 0;
 }
 
-- 
1.7.10.1

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