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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>
This commit is contained in:
Michael Hennerich 2023-11-29 14:03:53 +01:00 committed by Jonathan Cameron
parent d49f69425d
commit e737d495b2
1 changed files with 8 additions and 1 deletions
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9
drivers/iio/dac/ad5791.c
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@ -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 |