i2c: mpc: Use devm_clk_get_optional_enabled() to simplify code

devm_clk_get_optional() and clk_prepare_enable() can be replaced by the
helper function devm_clk_get_optional_enabled(). Let's simplify the code by
using devm_clk_get_optional_enabled() and avoid calling
clk_disable_unprepare().

Signed-off-by: Zhang Zekun <zhangzekun11@huawei.com>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: Zhang Zekun

drivers/i2c/busses/i2c-mpc.c

@@ -88,7 +88,6 @@ struct mpc_i2c {
 	int irq;
 	u32 real_clk;
 	u8 fdr, dfsrr;
-	struct clk *clk_per;
 	u32 cntl_bits;
 	enum mpc_i2c_action action;
 	struct i2c_msg *msgs;
@@ -779,7 +778,6 @@ static int fsl_i2c_probe(struct platform_device *op)
 	struct clk *clk;
 	int result;
 	u32 clock;
-	int err;
 
 	i2c = devm_kzalloc(&op->dev, sizeof(*i2c), GFP_KERNEL);
 	if (!i2c)
@@ -809,18 +807,12 @@ static int fsl_i2c_probe(struct platform_device *op)
 	 * enable clock for the I2C peripheral (non fatal),
 	 * keep a reference upon successful allocation
 	 */
-	clk = devm_clk_get_optional(&op->dev, NULL);
-	if (IS_ERR(clk))
-		return PTR_ERR(clk);
-
-	err = clk_prepare_enable(clk);
-	if (err) {
+	clk = devm_clk_get_optional_enabled(&op->dev, NULL);
+	if (IS_ERR(clk)) {
 		dev_err(&op->dev, "failed to enable clock\n");
-		return err;
+		return PTR_ERR(clk);
 	}
 
-	i2c->clk_per = clk;
-
 	if (of_property_read_bool(op->dev.of_node, "fsl,preserve-clocking")) {
 		clock = MPC_I2C_CLOCK_PRESERVE;
 	} else {
@@ -876,23 +868,16 @@ static int fsl_i2c_probe(struct platform_device *op)
 
 	result = i2c_add_numbered_adapter(&i2c->adap);
 	if (result)
-		goto fail_add;
+		return result;
 
 	return 0;
-
- fail_add:
-	clk_disable_unprepare(i2c->clk_per);
-
-	return result;
 };
 
 static void fsl_i2c_remove(struct platform_device *op)
 {
 	struct mpc_i2c *i2c = platform_get_drvdata(op);
 
 	i2c_del_adapter(&i2c->adap);
-
-	clk_disable_unprepare(i2c->clk_per);
 };
 
 static int __maybe_unused mpc_i2c_suspend(struct device *dev)