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iio: dac: ad5686: consume optional reset signal

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Add RESET pin GPIO support through an optional reset control, which is
local to the probe function. A reset pulse is manually generated after
the device is powered up.

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Rodrigo Alencar 2026-06-28 15:08:13 +01:00 committed by Jonathan Cameron
parent 4dd5a69dbe
commit a1f417cc59
1 changed files with 12 additions and 0 deletions
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12
drivers/iio/dac/ad5686.c
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@ -15,6 +15,7 @@
#include <linux/kstrtox.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/sysfs.h>
#include <linux/wordpart.h>
@ -472,6 +473,7 @@ int ad5686_probe(struct device *dev,
const struct ad5686_chip_info *chip_info,
const char *name, const struct ad5686_bus_ops *ops)
{
struct reset_control *rstc;
struct ad5686_state *st;
struct iio_dev *indio_dev;
int ret, i;
@ -486,6 +488,11 @@ int ad5686_probe(struct device *dev,
st->ops = ops;
st->chip_info = chip_info;
rstc = devm_reset_control_get_optional_exclusive(dev, NULL);
if (IS_ERR(rstc))
return dev_err_probe(dev, PTR_ERR(rstc),
"Failed to get reset control\n");
ret = devm_regulator_get_enable(dev, "vdd");
if (ret)
return dev_err_probe(dev, ret, "failed to enable vdd supply\n");
@ -509,6 +516,11 @@ int ad5686_probe(struct device *dev,
/* 4.5us power-up time: Datasheet Table 4: Timing Characteristics */
fsleep(5);
/* 1us >> 30ns reset pulse activation time: Datasheet Table 4 */
reset_control_assert(rstc);
fsleep(1);
reset_control_deassert(rstc);
/* Initialize masks to all ones */
st->pwr_down_mask = ~0;
st->pwr_down_mode = ~0;