phy: socionext: get optional clock by devm_clk_get_optional()

Use devm_clk_get_optional() to get optional clock

Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/socionext/phy-uniphier-usb3hs.c

@@ -335,13 +335,9 @@ static int uniphier_u3hsphy_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->clk_parent))
 		return PTR_ERR(priv->clk_parent);
 
-	priv->clk_ext = devm_clk_get(dev, "phy-ext");
-	if (IS_ERR(priv->clk_ext)) {
-		if (PTR_ERR(priv->clk_ext) == -ENOENT)
-			priv->clk_ext = NULL;
-		else
+	priv->clk_ext = devm_clk_get_optional(dev, "phy-ext");
+	if (IS_ERR(priv->clk_ext))
 		return PTR_ERR(priv->clk_ext);
-	}
 
 	priv->rst = devm_reset_control_get_shared(dev, "phy");
 	if (IS_ERR(priv->rst))

drivers/phy/socionext/phy-uniphier-usb3ss.c

@@ -238,13 +238,9 @@ static int uniphier_u3ssphy_probe(struct platform_device *pdev)
 		if (IS_ERR(priv->clk))
 			return PTR_ERR(priv->clk);
 
-		priv->clk_ext = devm_clk_get(dev, "phy-ext");
-		if (IS_ERR(priv->clk_ext)) {
-			if (PTR_ERR(priv->clk_ext) == -ENOENT)
-				priv->clk_ext = NULL;
-			else
+		priv->clk_ext = devm_clk_get_optional(dev, "phy-ext");
+		if (IS_ERR(priv->clk_ext))
 			return PTR_ERR(priv->clk_ext);
-		}
 
 		priv->rst = devm_reset_control_get_shared(dev, "phy");
 		if (IS_ERR(priv->rst))