Replace pr_err() with dev_err_ratelimited() in the RAW read path to avoid
log spam on repeated I2C failures and to include the device context.

Use %pe to print errno names for faster debugging. Use the parent
device context to identify the physical hardware causing the error.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
changes v3:
- Use indio_dev->dev.parent to reference the physical device.
- Remove redundant space in error message: "channel %d: %pe".
- This patch now precedes regmap refactoring.
changes v2:
- Update error message
- Rebase against regmap refactoring
---
 drivers/iio/dac/ds4424.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/dac/ds4424.c b/drivers/iio/dac/ds4424.c
index 596ff5999271..36286e4923af 100644
--- a/drivers/iio/dac/ds4424.c
+++ b/drivers/iio/dac/ds4424.c
@@ -100,8 +100,9 @@ static int ds4424_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_RAW:
 		ret = ds4424_get_value(indio_dev, &regval, chan->channel);
 		if (ret < 0) {
-			pr_err("%s : ds4424_get_value returned %d\n",
-							__func__, ret);
+			dev_err_ratelimited(indio_dev->dev.parent,
+					    "Failed to read channel %d: %pe\n",
+					    chan->channel, ERR_PTR(ret));
 			return ret;
 		}
 
-- 
2.47.3