[PATCH v2] iio: adc: bcm_iproc_adc: Convert probe() to use dev_err_probe()

[mdshahid03@gmail.com]

From: Mohammad Shahid <mdshahid03@gmail.com>

Replace open-coded probe error handling with dev_err_probe() for
resource acquisition and initialization failures.

This simplifies the error paths, avoids repetitive error handling,
and automatically suppresses duplicate messages when -EPROBE_DEFER is
returned while preserving the existing error messages.

Also remove the redundant error message after iproc_adc_enable(),
allowing the error to be propagated without additional logging.

Signed-off-by: Mohammad Shahid <mdshahid03@gmail.com>
---
v2:
- Convert remaining probe error paths to use dev_err_probe().
- Remove redundant error message after iproc_adc_enable()
 drivers/iio/adc/bcm_iproc_adc.c | 52 +++++++++++++++------------------
 1 file changed, 24 insertions(+), 28 deletions(-)

diff --git a/drivers/iio/adc/bcm_iproc_adc.c b/drivers/iio/adc/bcm_iproc_adc.c
index cf4738b16e62..08e056468d8e 100644
--- a/drivers/iio/adc/bcm_iproc_adc.c
+++ b/drivers/iio/adc/bcm_iproc_adc.c
@@ -522,52 +522,48 @@ static int iproc_adc_probe(struct platform_device *pdev)
 
 	adc_priv->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 			   "adc-syscon");
-	if (IS_ERR(adc_priv->regmap)) {
-		dev_err(&pdev->dev, "failed to get handle for tsc syscon\n");
-		ret = PTR_ERR(adc_priv->regmap);
-		return ret;
-	}
+	if (IS_ERR(adc_priv->regmap))
+		return dev_err_probe(&pdev->dev,
+				     PTR_ERR(adc_priv->regmap),
+				     "failed to get handle for tsc syscon\n");
 
 	adc_priv->adc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
-	if (IS_ERR(adc_priv->adc_clk)) {
-		dev_err(&pdev->dev,
-			"failed getting clock tsc_clk\n");
-		ret = PTR_ERR(adc_priv->adc_clk);
-		return ret;
-	}
+	if (IS_ERR(adc_priv->adc_clk))
+		return dev_err_probe(&pdev->dev,
+				     PTR_ERR(adc_priv->adc_clk),
+				     "failed getting clock tsc_clk\n");
 
 	adc_priv->irqno = platform_get_irq(pdev, 0);
 	if (adc_priv->irqno < 0)
-		return adc_priv->irqno;
+		return dev_err_probe(&pdev->dev,
+				     adc_priv->irqno,
+				     "failed to get IRQ\n");
 
 	ret = regmap_clear_bits(adc_priv->regmap, IPROC_REGCTL2,
 				IPROC_ADC_AUXIN_SCAN_ENA);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to write IPROC_REGCTL2 %d\n", ret);
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(&pdev->dev,
+				     ret,
+				     "failed to write IPROC_REGCTL2\n");
 
 	ret = devm_request_threaded_irq(&pdev->dev, adc_priv->irqno,
 				iproc_adc_interrupt_handler,
 				iproc_adc_interrupt_thread,
 				IRQF_SHARED, "iproc-adc", indio_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "request_irq error %d\n", ret);
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(&pdev->dev,
+				     ret,
+				     "failed to request IRQ\n");
 
 	ret = clk_prepare_enable(adc_priv->adc_clk);
-	if (ret) {
-		dev_err(&pdev->dev,
-			"clk_prepare_enable failed %d\n", ret);
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(&pdev->dev,
+				     ret,
+				     "failed to enable clock\n");
 
 	ret = iproc_adc_enable(indio_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to enable adc %d\n", ret);
+	if (ret)
 		goto err_adc_enable;
-	}
 
 	indio_dev->name = "iproc-static-adc";
 	indio_dev->info = &iproc_adc_iio_info;
-- 
2.43.0