[PATCH 1/2] i2c: s3c2410: Print errno code in error logs

[Javier Martinez Canillas]

The driver not always prints the error code in case of a failure but this
information can be very useful for debugging. So let's print if available.

Signed-off-by: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>

---

Hello,

This patch and 2/2 were only build tested because I don't have access to
a board using this IP block. I just noticed these issues when comparing
the i2c-s3c2410 driver with i2c-exynos5 where I did some fixes recently.

I think the patches are simple enough that is safe to pick them but of
course testing will be highly appreciated.

Best regards,
Javier

 drivers/i2c/busses/i2c-s3c2410.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 362a6de54833..4b873fe9a75b 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -944,7 +944,7 @@ static int s3c24xx_i2c_cpufreq_transition(struct notifier_block *nb,
 		i2c_unlock_adapter(&i2c->adap);
 
 		if (ret < 0)
-			dev_err(i2c->dev, "cannot find frequency\n");
+			dev_err(i2c->dev, "cannot find frequency (%d)\n", ret);
 		else
 			dev_info(i2c->dev, "setting freq %d\n", got);
 	}
@@ -995,7 +995,8 @@ static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
 
 		ret = gpio_request(gpio, "i2c-bus");
 		if (ret) {
-			dev_err(i2c->dev, "gpio [%d] request failed\n", gpio);
+			dev_err(i2c->dev, "gpio [%d] request failed (%d)\n",
+				gpio, ret);
 			goto free_gpio;
 		}
 	}
@@ -1199,7 +1200,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	ret = s3c24xx_i2c_init(i2c);
 	clk_disable(i2c->clk);
 	if (ret != 0) {
-		dev_err(&pdev->dev, "I2C controller init failed\n");
+		dev_err(&pdev->dev, "I2C controller init failed (%d)\n", ret);
 		return ret;
 	}
 	/* find the IRQ for this unit (note, this relies on the init call to
@@ -1209,7 +1210,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	if (!(i2c->quirks & QUIRK_POLL)) {
 		i2c->irq = ret = platform_get_irq(pdev, 0);
 		if (ret <= 0) {
-			dev_err(&pdev->dev, "cannot find IRQ\n");
+			dev_err(&pdev->dev, "cannot find IRQ (%d)\n", ret);
 			clk_unprepare(i2c->clk);
 			return ret;
 		}
@@ -1218,7 +1219,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 				dev_name(&pdev->dev), i2c);
 
 		if (ret != 0) {
-			dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
+			dev_err(&pdev->dev, "cannot claim IRQ %d (%d)\n",
+				i2c->irq, ret);
 			clk_unprepare(i2c->clk);
 			return ret;
 		}
@@ -1226,7 +1228,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 
 	ret = s3c24xx_i2c_register_cpufreq(i2c);
 	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
+		dev_err(&pdev->dev, "failed to register cpufreq notifier (%d)\n",
+			ret);
 		clk_unprepare(i2c->clk);
 		return ret;
 	}
@@ -1246,7 +1249,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 
 	ret = i2c_add_numbered_adapter(&i2c->adap);
 	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to add bus to i2c core\n");
+		dev_err(&pdev->dev, "failed to add bus to i2c core (%d)\n",
+			ret);
 		pm_runtime_disable(&pdev->dev);
 		s3c24xx_i2c_deregister_cpufreq(i2c);
 		clk_unprepare(i2c->clk);
-- 
2.5.5