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authorMichael Hennerich <michael.hennerich@analog.com>2023-11-29 14:03:53 +0100
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2023-12-04 13:19:48 +0000
commite737d495b207592106b38449cc9f402133456062 (patch)
tree3b041fd884ffd586787a76506aa2c90be72a0b53 /drivers/iio/dac
parentd49f69425d0db21c80c11ee537220658262bb7f4 (diff)
iio: dac: ad5791: Add support for controlling RBUF via devicetree
This patch adds support for an external amplifier to be connected in a gain of two configuration. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Nuno Sa <nuno.sa@analog.com> Link: https://lore.kernel.org/r/20231129-ad5791-michael-stuff-v3-2-48e192b00909@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/dac')
-rw-r--r--drivers/iio/dac/ad5791.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/iio/dac/ad5791.c b/drivers/iio/dac/ad5791.c
index a4167454da81..75b549827e15 100644
--- a/drivers/iio/dac/ad5791.c
+++ b/drivers/iio/dac/ad5791.c
@@ -345,6 +345,7 @@ static int ad5791_probe(struct spi_device *spi)
struct iio_dev *indio_dev;
struct ad5791_state *st;
int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
+ bool use_rbuf_gain2;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
@@ -379,6 +380,12 @@ static int ad5791_probe(struct spi_device *spi)
st->pwr_down = true;
st->spi = spi;
+ if (pdata)
+ use_rbuf_gain2 = pdata->use_rbuf_gain2;
+ else
+ use_rbuf_gain2 = device_property_read_bool(&spi->dev,
+ "adi,rbuf-gain2-en");
+
if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
st->vref_neg_mv = neg_voltage_uv / 1000;
@@ -398,7 +405,7 @@ static int ad5791_probe(struct spi_device *spi)
st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
- | ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
+ | (use_rbuf_gain2 ? 0 : AD5791_CTRL_RBUF) |
AD5791_CTRL_BIN2SC;
ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl |