dmaengine: mv_xor_v2: Use some clk_ helper functions to simplify code

Use devm_clk_get_[optional_]enabled() instead of hand writing it.
It saves some LoC.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/cc14e490f4e6002a17c9c7d283fe6a93179766c2.1679814350.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/mv_xor_v2.c

@@ -739,32 +739,18 @@ static int mv_xor_v2_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	xor_dev->reg_clk = devm_clk_get(&pdev->dev, "reg");
-	if (PTR_ERR(xor_dev->reg_clk) != -ENOENT) {
-		if (!IS_ERR(xor_dev->reg_clk)) {
-			ret = clk_prepare_enable(xor_dev->reg_clk);
-			if (ret)
-				return ret;
-		} else {
-			return PTR_ERR(xor_dev->reg_clk);
-		}
-	}
+	xor_dev->reg_clk = devm_clk_get_optional_enabled(&pdev->dev, "reg");
+	if (IS_ERR(xor_dev->reg_clk))
+		return PTR_ERR(xor_dev->reg_clk);
 
-	xor_dev->clk = devm_clk_get(&pdev->dev, NULL);
-	if (PTR_ERR(xor_dev->clk) == -EPROBE_DEFER) {
-		ret = -EPROBE_DEFER;
-		goto disable_reg_clk;
-	}
-	if (!IS_ERR(xor_dev->clk)) {
-		ret = clk_prepare_enable(xor_dev->clk);
-		if (ret)
-			goto disable_reg_clk;
-	}
+	xor_dev->clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(xor_dev->clk))
+		return PTR_ERR(xor_dev->clk);
 
 	ret = platform_msi_domain_alloc_irqs(&pdev->dev, 1,
 					     mv_xor_v2_set_msi_msg);
 	if (ret)
-		goto disable_clk;
+		return ret;
 
 	xor_dev->irq = msi_get_virq(&pdev->dev, 0);
 
@@ -866,10 +852,6 @@ free_hw_desq:
 			  xor_dev->hw_desq_virt, xor_dev->hw_desq);
 free_msi_irqs:
 	platform_msi_domain_free_irqs(&pdev->dev);
-disable_clk:
-	clk_disable_unprepare(xor_dev->clk);
-disable_reg_clk:
-	clk_disable_unprepare(xor_dev->reg_clk);
 	return ret;
 }
 
@@ -889,9 +871,6 @@ static int mv_xor_v2_remove(struct platform_device *pdev)
 
 	tasklet_kill(&xor_dev->irq_tasklet);
 
-	clk_disable_unprepare(xor_dev->clk);
-	clk_disable_unprepare(xor_dev->reg_clk);
-
 	return 0;
 }