diff options
| -rw-r--r-- | drivers/iio/adc/hi8435.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/iio/adc/hi8435.c b/drivers/iio/adc/hi8435.c index ba9e8fc747b8..7401f102dff4 100644 --- a/drivers/iio/adc/hi8435.c +++ b/drivers/iio/adc/hi8435.c @@ -453,13 +453,15 @@ static int hi8435_probe(struct spi_device *spi) priv->spi = spi; reset_gpio = devm_gpiod_get(&spi->dev, NULL, GPIOD_OUT_LOW); - if (IS_ERR(reset_gpio)) { - /* chip s/w reset if h/w reset failed */ + if (!IS_ERR(reset_gpio)) { + /* need >=100ns low pulse to reset chip */ + gpiod_set_raw_value_cansleep(reset_gpio, 0); + udelay(1); + gpiod_set_raw_value_cansleep(reset_gpio, 1); + } else { + /* s/w reset chip if h/w reset is not available */ hi8435_writeb(priv, HI8435_CTRL_REG, HI8435_CTRL_SRST); hi8435_writeb(priv, HI8435_CTRL_REG, 0); - } else { - udelay(5); - gpiod_set_value(reset_gpio, 1); } spi_set_drvdata(spi, idev); |