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iio: dac: ad5686: add ldac gpio

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If wired LDAC, should be asserted when unused (pin is active-low), which
allows for synchronous DAC updates. This will be used to update all the
channels at the same time when adding buffer support.

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 15:08:14 +01:00 committed by Jonathan Cameron
parent a1f417cc59
commit b15df8dab7
2 changed files with 10 additions and 0 deletions
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6
drivers/iio/dac/ad5686.c
View File

@ -12,6 +12,7 @@
#include <linux/dev_printk.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/gpio/consumer.h>
#include <linux/kstrtox.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
@ -521,6 +522,11 @@ int ad5686_probe(struct device *dev,
fsleep(1);
reset_control_deassert(rstc);
st->ldac_gpio = devm_gpiod_get_optional(dev, "ldac", GPIOD_OUT_HIGH);
if (IS_ERR(st->ldac_gpio))
return dev_err_probe(dev, PTR_ERR(st->ldac_gpio),
"Failed to get LDAC GPIO\n");
/* Initialize masks to all ones */
st->pwr_down_mask = ~0;
st->pwr_down_mode = ~0;

4
drivers/iio/dac/ad5686.h
View File

@ -60,6 +60,8 @@ enum ad5686_regmap_type {
AD5686_REGMAP,
};
struct gpio_desc;
struct ad5686_state;
/**
@ -119,6 +121,7 @@ extern const struct ad5686_chip_info ad5679r_chip_info;
* @dev: device instance
* @chip_info: chip model specific constants, available modes etc
* @ops: bus specific operations
* @ldac_gpio: LDAC pin GPIO descriptor
* @vref_mv: actual reference voltage used
* @pwr_down_mask: power down mask
* @pwr_down_mode: current power down mode
@ -131,6 +134,7 @@ struct ad5686_state {
struct device *dev;
const struct ad5686_chip_info *chip_info;
const struct ad5686_bus_ops *ops;
struct gpio_desc *ldac_gpio;
unsigned short vref_mv;
unsigned int pwr_down_mask;
unsigned int pwr_down_mode;