By default the driver was always setting the RANGE bit which means that
the analog input goes from 0 to VREF. However, we might want to have 0
to 2xVREF. This change adds a new Firmware property to allow for the
extended range while keeping the default behavior if nothing is provided.
Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
---
drivers/iio/adc/ad7923.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 502253f53d96..9d6bf6d0927a 100644
--- a/drivers/iio/adc/ad7923.c
+++ b/drivers/iio/adc/ad7923.c
@@ -8,6 +8,7 @@
#include <linux/device.h>
#include <linux/kernel.h>
+#include <linux/property.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
@@ -300,6 +301,7 @@ static void ad7923_regulator_disable(void *data)
static int ad7923_probe(struct spi_device *spi)
{
+ u32 ad7923_range = AD7923_RANGE;
struct ad7923_state *st;
struct iio_dev *indio_dev;
const struct ad7923_chip_info *info;
@@ -311,8 +313,11 @@ static int ad7923_probe(struct spi_device *spi)
st = iio_priv(indio_dev);
+ if (device_property_read_bool(&spi->dev, "adi,range-double"))
+ ad7923_range = 0;
+
st->spi = spi;
- st->settings = AD7923_CODING | AD7923_RANGE |
+ st->settings = AD7923_CODING | ad7923_range |
AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS);
info = &ad7923_chip_info[spi_get_device_id(spi)->driver_data];
--
2.37.3
