linux-kernel - [PATCH V3 3/4] i2c: s3c2410: Move location of clk_prepare

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Date:	Thu, 24 Jan 2013 15:41:08 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org
Cc:	w.sang@...gutronix.de, kgene.kim@...sung.com, patches@...aro.org
Subject: [PATCH V3 3/4] i2c: s3c2410: Move location of clk_prepare_enable() call in probe function

In i2c-s3c2410 driver probe, only s3c24xx_i2c_init() needs the I2C clock
to be enabled. Moving clk_prepare_enable() and clk_disable_unprepare()
calls to around this function simplifies the return path of probe call.

Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
---
Changes since V2:
  * Rebased to v3.8-rc4.

Changes since V1:
  * Rebased as per the V2 patch series.

 drivers/i2c/busses/i2c-s3c2410.c |   29 ++++++++++++-----------------
 1 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 4b6cc13..4d1ba8d 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -1030,23 +1030,20 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 
 	dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk);
 
-	clk_prepare_enable(i2c->clk);
 
 	/* map the registers */
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "cannot find IO resource\n");
-		ret = -ENOENT;
-		goto err_clk;
+		return -ENOENT;
 	}
 
 	i2c->regs = devm_request_and_ioremap(&pdev->dev, res);
 
 	if (i2c->regs == NULL) {
 		dev_err(&pdev->dev, "cannot request and map IO\n");
-		ret = -ENXIO;
-		goto err_clk;
+		return -ENXIO;
 	}
 
 	dev_dbg(&pdev->dev, "registers %p (%p)\n",
@@ -1064,16 +1061,18 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	if (i2c->pdata->cfg_gpio) {
 		i2c->pdata->cfg_gpio(to_platform_device(i2c->dev));
 	} else if (IS_ERR(i2c->pctrl) && s3c24xx_i2c_parse_dt_gpio(i2c)) {
-		ret = -EINVAL;
-		goto err_clk;
+		return -EINVAL;
 	}
 
 	/* initialise the i2c controller */
 
+	clk_prepare_enable(i2c->clk);
 	ret = s3c24xx_i2c_init(i2c);
-	if (ret != 0)
-		goto err_clk;
-
+	clk_disable_unprepare(i2c->clk);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "I2C controller init failed\n");
+		return ret;
+	}
 	/* find the IRQ for this unit (note, this relies on the init call to
 	 * ensure no current IRQs pending
 	 */
@@ -1081,7 +1080,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	i2c->irq = ret = platform_get_irq(pdev, 0);
 	if (ret <= 0) {
 		dev_err(&pdev->dev, "cannot find IRQ\n");
-		goto err_clk;
+		return ret;
 	}
 
 	ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq, 0,
@@ -1089,13 +1088,13 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 
 	if (ret != 0) {
 		dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
-		goto err_clk;
+		return ret;
 	}
 
 	ret = s3c24xx_i2c_register_cpufreq(i2c);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
-		goto err_clk;
+		return ret;
 	}
 
 	/* Note, previous versions of the driver used i2c_add_adapter()
@@ -1120,14 +1119,10 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	pm_runtime_enable(&i2c->adap.dev);
 
 	dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
-	clk_disable_unprepare(i2c->clk);
 	return 0;
 
  err_cpufreq:
 	s3c24xx_i2c_deregister_cpufreq(i2c);
-
- err_clk:
-	clk_disable_unprepare(i2c->clk);
 	return ret;
 }
 
-- 
1.7.4.1

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