[PATCH AUTOSEL 5.4 116/350] iio: adc: max1027: Reset the device at probe time

Sasha Levin
2019-12-10T21:47:45Z

From: Miquel Raynal <miquel.raynal@bootlin.com>

[ 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>
---
drivers/iio/adc/max1027.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 2148834585825..e3be8eedd773f 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -458,6 +458,14 @@ static int max1027_probe(struct spi_device *spi)
return ret;
}

+ /* 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);
--
2.20.1