phy: ti: am654-serdes: Use scoped device node handling to simplify error paths

Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler.

Unlike in other typical of_node_get+syscon_node_to_regmap cases, the
reference cannot be dropped immediately after syscon_node_to_regmap(),
because further part of probe() uses it.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240826-phy-of-node-scope-v1-8-5b4d82582644@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: krzk

drivers/phy/ti/phy-am654-serdes.c

@@ -7,6 +7,7 @@
  */
 
 #include <dt-bindings/phy/phy.h>
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
@@ -644,57 +645,44 @@ static int serdes_am654_clk_register(struct serdes_am654 *am654_phy,
 	struct device_node *node = am654_phy->of_node;
 	struct device *dev = am654_phy->dev;
 	struct serdes_am654_clk_mux *mux;
-	struct device_node *regmap_node;
 	const char **parent_names;
 	struct clk_init_data *init;
 	unsigned int num_parents;
 	struct regmap *regmap;
 	const __be32 *addr;
 	unsigned int reg;
 	struct clk *clk;
-	int ret = 0;
 
 	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
 	if (!mux)
 		return -ENOMEM;
 
 	init = &mux->clk_data;
 
-	regmap_node = of_parse_phandle(node, "ti,serdes-clk", 0);
-	if (!regmap_node) {
-		dev_err(dev, "Fail to get serdes-clk node\n");
-		ret = -ENODEV;
-		goto out_put_node;
-	}
+	struct device_node *regmap_node __free(device_node) =
+		of_parse_phandle(node, "ti,serdes-clk", 0);
+	if (!regmap_node)
+		return dev_err_probe(dev, -ENODEV, "Fail to get serdes-clk node\n");
 
 	regmap = syscon_node_to_regmap(regmap_node->parent);
-	if (IS_ERR(regmap)) {
-		dev_err(dev, "Fail to get Syscon regmap\n");
-		ret = PTR_ERR(regmap);
-		goto out_put_node;
-	}
+	if (IS_ERR(regmap))
+		return dev_err_probe(dev, PTR_ERR(regmap),
+				     "Fail to get Syscon regmap\n");
 
 	num_parents = of_clk_get_parent_count(node);
-	if (num_parents < 2) {
-		dev_err(dev, "SERDES clock must have parents\n");
-		ret = -EINVAL;
-		goto out_put_node;
-	}
+	if (num_parents < 2)
+		return dev_err_probe(dev, -EINVAL, "SERDES clock must have parents\n");
 
 	parent_names = devm_kzalloc(dev, (sizeof(char *) * num_parents),
 				    GFP_KERNEL);
-	if (!parent_names) {
-		ret = -ENOMEM;
-		goto out_put_node;
-	}
+	if (!parent_names)
+		return -ENOMEM;
 
 	of_clk_parent_fill(node, parent_names, num_parents);
 
 	addr = of_get_address(regmap_node, 0, NULL, NULL);
-	if (!addr) {
-		ret = -EINVAL;
-		goto out_put_node;
-	}
+	if (!addr)
+		return -EINVAL;
 
 	reg = be32_to_cpu(*addr);
 
@@ -710,16 +698,12 @@ static int serdes_am654_clk_register(struct serdes_am654 *am654_phy,
 	mux->hw.init = init;
 
 	clk = devm_clk_register(dev, &mux->hw);
-	if (IS_ERR(clk)) {
-		ret = PTR_ERR(clk);
-		goto out_put_node;
-	}
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
 
 	am654_phy->clks[clock_num] = clk;
 
-out_put_node:
-	of_node_put(regmap_node);
-	return ret;
+	return 0;
 }
 
 static const struct of_device_id serdes_am654_id_table[] = {