Commit e737d495 authored by Michael Hennerich's avatar Michael Hennerich Committed by Jonathan Cameron
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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: default avatarMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: default avatarNuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20231129-ad5791-michael-stuff-v3-2-48e192b00909@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent d49f6942

drivers/iio/dac/ad5791.c

+8 −1
Original line number Diff line number Diff line
@@ -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 |