[PATCH v4 8/9] iio: adc: rockchip_saradc: Make use of the helper function dev_err_probe()

[Cai Huoqing]

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
Using dev_err_probe() can reduce code size, and the error value
gets printed.

Signed-off-by: Cai Huoqing <caihuoqing at baidu.com>
---
v1->v2: Remove the separate line of PTR_ERR().
v3->v4:
	*Handle devm_reset_control_get_exclusive() by dev_err_probe().
	*Handle platform_get_irq() that returns -EPROBE_DEFER.

 drivers/iio/adc/rockchip_saradc.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index a56a0d7337ca..14b8df4ca9c8 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -360,7 +360,8 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
 	if (IS_ERR(info->reset)) {
 		ret = PTR_ERR(info->reset);
 		if (ret != -ENOENT)
-			return ret;
+			return dev_err_probe(&pdev->dev, ret,
+					     "failed to get saradc-apb\n");
 
 		dev_dbg(&pdev->dev, "no reset control found\n");
 		info->reset = NULL;
@@ -370,7 +371,7 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
-		return irq;
+		return dev_err_probe(&pdev->dev, irq, "failed to get irq\n");
 
 	ret = devm_request_irq(&pdev->dev, irq, rockchip_saradc_isr,
 			       0, dev_name(&pdev->dev), info);
@@ -380,23 +381,19 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
 	}
 
 	info->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
-	if (IS_ERR(info->pclk)) {
-		dev_err(&pdev->dev, "failed to get pclk\n");
-		return PTR_ERR(info->pclk);
-	}
+	if (IS_ERR(info->pclk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(info->pclk),
+				     "failed to get pclk\n");
 
 	info->clk = devm_clk_get(&pdev->dev, "saradc");
-	if (IS_ERR(info->clk)) {
-		dev_err(&pdev->dev, "failed to get adc clock\n");
-		return PTR_ERR(info->clk);
-	}
+	if (IS_ERR(info->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(info->clk),
+				     "failed to get adc clock\n");
 
 	info->vref = devm_regulator_get(&pdev->dev, "vref");
-	if (IS_ERR(info->vref)) {
-		dev_err(&pdev->dev, "failed to get regulator, %ld\n",
-			PTR_ERR(info->vref));
-		return PTR_ERR(info->vref);
-	}
+	if (IS_ERR(info->vref))
+		return dev_err_probe(&pdev->dev, PTR_ERR(info->vref),
+				     "failed to get regulator\n");
 
 	if (info->reset)
 		rockchip_saradc_reset_controller(info->reset);
-- 
2.25.1