[PATCH v3 08/13] iio: adc: ad7091r: Enable internal vref if external vref is not supplied
From: Marcelo Schmitt <marcelo.schmitt@analog.com>
Date: 2023-12-07 18:42:09
Also in:
linux-iio, lkml
Subsystem:
analog devices inc ad7091r driver, analog devices inc iio drivers, iio subsystem and drivers, the rest · Maintainers:
Marcelo Schmitt, Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron, Linus Torvalds
The ADC needs a voltage reference to work correctly. Enable AD7091R internal voltage reference if no external vref is supplied. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> --- drivers/iio/adc/ad7091r-base.c | 9 ++++++--- drivers/iio/adc/ad7091r-base.h | 1 + 2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c
index f2cb638b8d77..59a7ec44955d 100644
--- a/drivers/iio/adc/ad7091r-base.c
+++ b/drivers/iio/adc/ad7091r-base.c@@ -215,10 +215,13 @@ int ad7091r_probe(struct device *dev, const char *name, iio_dev->channels = st->chip_info->channels; st->vref = devm_regulator_get_optional(dev, "vref"); - if (IS_ERR(st->vref)) { - if (PTR_ERR(st->vref) == -EPROBE_DEFER) - return -EPROBE_DEFER; + if (IS_ERR_OR_NULL(st->vref)) { + /* Enable internal vref */ st->vref = NULL; + ret = regmap_update_bits(st->map, AD7091R_REG_CONF, + AD7091R_REG_CONF_INT_VREF, BIT(0)); + if (ret) + return ret; } else { ret = regulator_enable(st->vref); if (ret)
diff --git a/drivers/iio/adc/ad7091r-base.h b/drivers/iio/adc/ad7091r-base.h
index 9546d0bf1da7..e153c2d7deb5 100644
--- a/drivers/iio/adc/ad7091r-base.h
+++ b/drivers/iio/adc/ad7091r-base.h@@ -20,6 +20,7 @@ #define AD7091R_REG_CH_HYSTERESIS(ch) ((ch) * 3 + 6) /* AD7091R_REG_CONF */ +#define AD7091R_REG_CONF_INT_VREF BIT(0) #define AD7091R_REG_CONF_ALERT_EN BIT(4) #define AD7091R_REG_CONF_AUTO BIT(8) #define AD7091R_REG_CONF_CMD BIT(10)
--
2.42.0