[PATCH v3 6/6] can: tcan4x5x: Add error messages in probe

[Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>]

To be able to understand issues during probe easier, add error messages
if something fails.

Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
---
 drivers/net/can/m_can/tcan4x5x-core.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 2d329b4e4f52..60380b50e553 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -402,6 +402,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 
 	/* Sanity check */
 	if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) {
+		dev_err(&spi->dev, "Clock frequency is out of supported range %d\n",
+			freq);
 		ret = -ERANGE;
 		goto out_m_can_class_free_dev;
 	}
@@ -420,16 +422,22 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	/* Configure the SPI bus */
 	spi->bits_per_word = 8;
 	ret = spi_setup(spi);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "SPI setup failed %d\n", ret);
 		goto out_m_can_class_free_dev;
+	}
 
 	ret = tcan4x5x_regmap_init(priv);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "regmap init failed %d\n", ret);
 		goto out_m_can_class_free_dev;
+	}
 
 	ret = tcan4x5x_power_enable(priv->power, 1);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Enabling regulator failed %d\n", ret);
 		goto out_m_can_class_free_dev;
+	}
 
 	version_info = tcan4x5x_find_version(priv);
 	if (IS_ERR(version_info)) {
@@ -438,16 +446,22 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	}
 
 	ret = tcan4x5x_get_gpios(mcan_class, version_info);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Getting gpios failed %d\n", ret);
 		goto out_power;
+	}
 
 	ret = tcan4x5x_init(mcan_class);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "tcan initialization failed %d\n", ret);
 		goto out_power;
+	}
 
 	ret = m_can_class_register(mcan_class);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Failed registering m_can device %d\n", ret);
 		goto out_power;
+	}
 
 	netdev_info(mcan_class->net, "TCAN4X5X successfully initialized.\n");
 	return 0;
-- 
2.40.1