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

From: Aren Moynihan <aren@peacevolution.org>
To: Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Samuel Holland <samuel@sholland.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>
Cc: "Aren Moynihan" <aren@peacevolution.org>,
	"Andy Shevchenko" <andy.shevchenko@gmail.com>,
	"Ondrej Jirman" <megi@xff.cz>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	linux-iio@vger.kernel.org, phone-devel@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev,
	"Willow Barraco" <contact@willowbarraco.fr>
Subject: [PATCH 3/4] iio: light: stk3310: log error if reading the chip id fails
Date: Sun, 14 Apr 2024 13:57:15 -0400	[thread overview]
Message-ID: <20240414175716.958831-3-aren@peacevolution.org> (raw)
In-Reply-To: <20240414175716.958831-1-aren@peacevolution.org>

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@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

