From: Rodrigo Alencar <[email protected]> If wired LDAC, should be held low 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 <[email protected]> --- drivers/iio/dac/ad5686.c | 6 ++++++ drivers/iio/dac/ad5686.h | 3 +++ 2 files changed, 9 insertions(+) diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c index 700798b80f04..db37c3e50389 100644 --- a/drivers/iio/dac/ad5686.c +++ b/drivers/iio/dac/ad5686.c @@ -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> @@ -513,6 +514,11 @@ int ad5686_probe(struct device *dev, return dev_err_probe(dev, PTR_ERR(rstc), "Failed to get reset control\n"); + 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"); + fsleep(5); /* power-up time */ reset_control_assert(rstc); fsleep(1); /* reset pulse: comfortably bigger than the spec */ diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h index a06fe7d89305..f3110410d89b 100644 --- a/drivers/iio/dac/ad5686.h +++ b/drivers/iio/dac/ad5686.h @@ -60,6 +60,7 @@ enum ad5686_regmap_type { AD5686_REGMAP, }; +struct gpio_desc; struct ad5686_state; /** @@ -119,6 +120,7 @@ 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 +133,7 @@ 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; -- 2.43.0
