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@linaro.org>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 4b6cc13..4d1ba8d 100644 (file)
--- 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;
 }