[PATCH 07/12] iio: dac: ad5686: add ldac gpio

[Rodrigo Alencar via B4 Relay]

From: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>

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 <rodrigo.alencar@xxxxxxxxxx>
---
 drivers/iio/dac/ad5686.c | 5 +++++
 drivers/iio/dac/ad5686.h | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
index 345ca2436332..8f91838c5b53 100644
--- a/drivers/iio/dac/ad5686.c
+++ b/drivers/iio/dac/ad5686.c
@@ -514,6 +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");
+
 	udelay(5); /* power-up time */
 	reset_control_assert(rstc);
 	udelay(1); /* reset pulse: comfortably bigger than the spec */
diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h
index a06fe7d89305..498d05ab12ee 100644
--- a/drivers/iio/dac/ad5686.h
+++ b/drivers/iio/dac/ad5686.h
@@ -9,6 +9,7 @@
 #define __DRIVERS_IIO_DAC_AD5686_H__
 
 #include <linux/bits.h>
+#include <linux/gpio/consumer.h>
 #include <linux/mutex.h>
 #include <linux/types.h>
 
@@ -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