i2c: emev2: Use devm_clk_get_enabled() helpers

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@vivo.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: qianfengrong

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;
@@ -397,34 +393,29 @@ 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)
 {
 	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[] = {