linux-kernel - [PATCH v3 2/6] soc: samsung: exynos-chipid: use dev_err

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Message-Id: <20251120-gs101-chipid-v3-2-1aeaa8b7fe35@linaro.org>
Date: Thu, 20 Nov 2025 11:29:36 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Peter Griffin <peter.griffin@...aro.org>, 
 André Draszik <andre.draszik@...aro.org>, 
 Srinivas Kandagatla <srini@...nel.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, semen.protsenko@...aro.org, 
 willmcvicker@...gle.com, kernel-team@...roid.com, 
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v3 2/6] soc: samsung: exynos-chipid: use dev_err_probe
 where appropiate

Use dev_err_probe() to benefit of the standardized format of the error
code (e.g. "ENODEV" instead of -19), to get meanigful error messages, and
for more compact error paths.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/soc/samsung/exynos-chipid.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
index 49cb113d99f314ed94730cec2b98f48a1a7b87f2..b9a30452ad21c326af35c06a341b28491cee6979 100644
--- a/drivers/soc/samsung/exynos-chipid.c
+++ b/drivers/soc/samsung/exynos-chipid.c
@@ -81,8 +81,8 @@ static const char *product_id_to_soc_id(unsigned int product_id)
 	return NULL;
 }
 
-static int exynos_chipid_get_chipid_info(struct regmap *regmap,
-		const struct exynos_chipid_variant *data,
+static int exynos_chipid_get_chipid_info(struct device *dev,
+		struct regmap *regmap, const struct exynos_chipid_variant *data,
 		struct exynos_chipid_info *soc_info)
 {
 	int ret;
@@ -90,13 +90,14 @@ static int exynos_chipid_get_chipid_info(struct regmap *regmap,
 
 	ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
 	if (ret < 0)
-		return ret;
+		return dev_err_probe(dev, ret, "failed to read Product ID\n");
 	soc_info->product_id = val & EXYNOS_MASK;
 
 	if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
 		ret = regmap_read(regmap, data->rev_reg, &val);
 		if (ret < 0)
-			return ret;
+			return dev_err_probe(dev, ret,
+					     "failed to read revision\n");
 	}
 	main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
 	sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
@@ -123,13 +124,15 @@ static int exynos_chipid_probe(struct platform_device *pdev)
 
 	drv_data = of_device_get_match_data(dev);
 	if (!drv_data)
-		return -EINVAL;
+		return dev_err_probe(dev, -EINVAL,
+				     "failed to get match data\n");
 
 	regmap = device_node_to_regmap(dev->of_node);
 	if (IS_ERR(regmap))
-		return PTR_ERR(regmap);
+		return dev_err_probe(dev, PTR_ERR(regmap),
+				     "failed to get regmap\n");
 
-	ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
+	ret = exynos_chipid_get_chipid_info(dev, regmap, drv_data, &soc_info);
 	if (ret < 0)
 		return ret;
 
@@ -148,15 +151,14 @@ static int exynos_chipid_probe(struct platform_device *pdev)
 	if (!soc_dev_attr->revision)
 		return -ENOMEM;
 	soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
-	if (!soc_dev_attr->soc_id) {
-		pr_err("Unknown SoC\n");
-		return -ENODEV;
-	}
+	if (!soc_dev_attr->soc_id)
+		return dev_err_probe(dev, -ENODEV, "Unknown SoC\n");
 
 	/* please note that the actual registration will be deferred */
 	soc_dev = soc_device_register(soc_dev_attr);
 	if (IS_ERR(soc_dev))
-		return PTR_ERR(soc_dev);
+		return dev_err_probe(dev, PTR_ERR(soc_dev),
+				     "failed to register to the soc interface\n");
 
 	ret = devm_add_action_or_reset(dev, exynos_chipid_unregister_soc,
 				       soc_dev);

-- 
2.52.0.rc1.455.g30608eb744-goog