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    Subject[PATCH 4.4 028/137] iio: adc: max1027: Reset the device at probe time
    Date
    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 41d495c6035e..7d5e4114e7a8 100644
    --- a/drivers/iio/adc/max1027.c
    +++ b/drivers/iio/adc/max1027.c
    @@ -470,6 +470,14 @@ 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);
    --
    2.20.1


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