[PATCH 3/4] iio: light: stk3310: log error if reading the chip id fails

[Aren Moynihan]

If the chip isn't powered, this call is likely to return an error.
Without a log here the driver will silently fail to probe. Common errors
are ENXIO (when the chip isn't powered) and ETIMEDOUT (when the i2c bus
isn't powered).

Signed-off-by: Aren Moynihan <aren at peacevolution.org>
---
 drivers/iio/light/stk3310.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/stk3310.c b/drivers/iio/light/stk3310.c
index bfa090538df7..c0954a63a143 100644
--- a/drivers/iio/light/stk3310.c
+++ b/drivers/iio/light/stk3310.c
@@ -472,8 +472,10 @@ static int stk3310_init(struct iio_dev *indio_dev)
 	struct i2c_client *client = data->client;
 
 	ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to read chip id: %d", ret);
 		return ret;
+	}
 
 	if (chipid != STK3310_CHIP_ID_VAL &&
 	    chipid != STK3311_CHIP_ID_VAL &&
-- 
2.44.0