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authorNuno Sá <nuno.sa@analog.com>2022-09-12 11:12:22 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2022-09-21 20:42:55 +0300
commit096d2dac25f9947d1cb1e16a16468de8fda685e6 (patch)
treea818ea5c6a4e52d741e8c543002ec67f097c7212 /drivers/iio
parentf4f43f01cff2f29779343ade755191afd2581c77 (diff)
downloadlinux-096d2dac25f9947d1cb1e16a16468de8fda685e6.tar.xz
iio: adc: ad7923: support extended range
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>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/ad7923.c7
1 files changed, 6 insertions, 1 deletions
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];