[PATCH v4 1/3] i2c: emev2: Use devm_clk_get_enabled() helpers

[Rong Qianfeng <rongqianfeng@xxxxxxxx>]

The devm_clk_get_enabled() helpers:
    - call devm_clk_get()
    - call clk_prepare_enable() and register what is needed in order to
     call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code and avoids the calls to clk_disable_unprepare().

While at it, no need to save clk pointer, drop sclk from struct
em_i2c_device.

Signed-off-by: Rong Qianfeng <rongqianfeng@xxxxxxxx>
---
 drivers/i2c/busses/i2c-emev2.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/drivers/i2c/busses/i2c-emev2.c b/drivers/i2c/busses/i2c-emev2.c
index 557409410445..d08be3f3cede 100644
--- a/drivers/i2c/busses/i2c-emev2.c
+++ b/drivers/i2c/busses/i2c-emev2.c
@@ -67,7 +67,6 @@ struct em_i2c_device {
 	void __iomem *base;
 	struct i2c_adapter adap;
 	struct completion msg_done;
-	struct clk *sclk;
 	struct i2c_client *slave;
 	int irq;
 };
@@ -361,6 +360,7 @@ static const struct i2c_algorithm em_i2c_algo = {
 static int em_i2c_probe(struct platform_device *pdev)
 {
 	struct em_i2c_device *priv;
+	struct clk *sclk;
 	int ret;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -373,13 +373,9 @@ static int em_i2c_probe(struct platform_device *pdev)
 
 	strscpy(priv->adap.name, "EMEV2 I2C", sizeof(priv->adap.name));
 
-	priv->sclk = devm_clk_get(&pdev->dev, "sclk");
-	if (IS_ERR(priv->sclk))
-		return PTR_ERR(priv->sclk);
-
-	ret = clk_prepare_enable(priv->sclk);
-	if (ret)
-		return ret;
+	sclk = devm_clk_get_enabled(&pdev->dev, "sclk");
+	if (IS_ERR(sclk))
+		return PTR_ERR(sclk);
 
 	priv->adap.timeout = msecs_to_jiffies(100);
 	priv->adap.retries = 5;
@@ -397,26 +393,22 @@ static int em_i2c_probe(struct platform_device *pdev)
 
 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0)
-		goto err_clk;
+		return ret;
 	priv->irq = ret;
+
 	ret = devm_request_irq(&pdev->dev, priv->irq, em_i2c_irq_handler, 0,
 				"em_i2c", priv);
 	if (ret)
-		goto err_clk;
+		return ret;
 
 	ret = i2c_add_adapter(&priv->adap);
-
 	if (ret)
-		goto err_clk;
+		return ret;
 
 	dev_info(&pdev->dev, "Added i2c controller %d, irq %d\n", priv->adap.nr,
 		 priv->irq);
 
 	return 0;
-
-err_clk:
-	clk_disable_unprepare(priv->sclk);
-	return ret;
 }
 
 static void em_i2c_remove(struct platform_device *dev)
@@ -424,7 +416,6 @@ static void em_i2c_remove(struct platform_device *dev)
 	struct em_i2c_device *priv = platform_get_drvdata(dev);
 
 	i2c_del_adapter(&priv->adap);
-	clk_disable_unprepare(priv->sclk);
 }
 
 static const struct of_device_id em_i2c_ids[] = {
-- 
2.39.0