linux-kernel - [PATCH 08/11] phy: ti: am654-serdes: Use scoped device node handling to simplify error paths

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Message-Id: <20240826-phy-of-node-scope-v1-8-5b4d82582644@linaro.org>
Date: Mon, 26 Aug 2024 12:07:24 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Ray Jui <rjui@...adcom.com>, 
 Scott Branden <sbranden@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Chunfeng Yun <chunfeng.yun@...iatek.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-phy@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org, 
 linux-arm-msm@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 08/11] 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@...aro.org>
---
 drivers/phy/ti/phy-am654-serdes.c | 50 +++++++++++++--------------------------
 1 file changed, 17 insertions(+), 33 deletions(-)

diff --git a/drivers/phy/ti/phy-am654-serdes.c b/drivers/phy/ti/phy-am654-serdes.c
index 673449607c02..3bf3aff4b1c7 100644
--- a/drivers/phy/ti/phy-am654-serdes.c
+++ b/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>
@@ -644,7 +645,6 @@ 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;
@@ -652,7 +652,6 @@ static int serdes_am654_clk_register(struct serdes_am654 *am654_phy,
 	const __be32 *addr;
 	unsigned int reg;
 	struct clk *clk;
-	int ret = 0;
 
 	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
 	if (!mux)
@@ -660,41 +659,30 @@ static int serdes_am654_clk_register(struct serdes_am654 *am654_phy,
 
 	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[] = {

-- 
2.43.0