From: Miquel Raynal <miquel.raynal@bootlin.com>
Date: Fri, 11 Oct 2019 14:43:42 +0000 (+0200)
Subject: iio: adc: max1027: Reset the device at probe time
X-Git-Tag: v4.19.92~140
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=eec8f08dc8b3fa8a3ed1e1c88187b7694e640c40;p=thirdparty%2Fkernel%2Fstable.git

iio: adc: max1027: Reset the device at probe time

[ Upstream commit db033831b4f5589f9fcbadb837614a7c4eac0308 ]

All the registers are configured by the driver, let's reset the chip
at probe time, avoiding any conflict with a possible earlier
configuration.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 311c1a89c329e..0939eb0384f1c 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -460,6 +460,14 @@ static int max1027_probe(struct spi_device *spi)
 		goto fail_dev_register;
 	}
 
+	/* Internal reset */
+	st->reg = MAX1027_RST_REG;
+	ret = spi_write(st->spi, &st->reg, 1);
+	if (ret < 0) {
+		dev_err(&indio_dev->dev, "Failed to reset the ADC\n");
+		return ret;
+	}
+
 	/* Disable averaging */
 	st->reg = MAX1027_AVG_REG;
 	ret = spi_write(st->spi, &st->reg, 1);