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iio: adc: ad7923: support extended range

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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@analog.com>
Link: https://lore.kernel.org/r/20220912081223.173584-3-nuno.sa@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sá
2022-09-12 10:12:22 +02:00
committed by Jonathan Cameron
parent f4f43f01cf
commit 096d2dac25
1 changed files with 6 additions and 1 deletions
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7
drivers/iio/adc/ad7923.c
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@@ -8,6 +8,7 @@
#include <linux/device.h> #include <linux/device.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/property.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/sysfs.h> #include <linux/sysfs.h>
#include <linux/spi/spi.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) static int ad7923_probe(struct spi_device *spi)
{ {
u32 ad7923_range = AD7923_RANGE;
struct ad7923_state *st; struct ad7923_state *st;
struct iio_dev *indio_dev; struct iio_dev *indio_dev;
const struct ad7923_chip_info *info; const struct ad7923_chip_info *info;
@@ -311,8 +313,11 @@ static int ad7923_probe(struct spi_device *spi)
st = iio_priv(indio_dev); st = iio_priv(indio_dev);
if (device_property_read_bool(&spi->dev, "adi,range-double"))
ad7923_range = 0;
st->spi = spi; st->spi = spi;
st->settings = AD7923_CODING | AD7923_RANGE | st->settings = AD7923_CODING | ad7923_range |
AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS); AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS);
info = &ad7923_chip_info[spi_get_device_id(spi)->driver_data]; info = &ad7923_chip_info[spi_get_device_id(spi)->driver_data];